Himmelstein MCRT 48600V Operating instructions

NEXTGEN ULTRA PRECISION DIGITAL TORQUEMETERS

INSTALLATION, OPERATION,AND TROUBLESHOOTING GUIDE

NEXTGEN ULTRA PRECISION DIGITAL TORQUEMETERS

INSTALLATION, OPERATION,AND TROUBLESHOOTING GUIDE

& COMPANY

2490 Pembroke Avenue, Hoffman Estates, IL 60169 • 847-843-3300

www.himmelstein.com

Revision F • April 2022

APPLIES TO SERIES

MCRT®48600V

MCRT®48800V

MCRT®49800V

MCRT®48850V/48851V

MCRT®59800V

MCRT®79800V

NGT

NextGen Ultra Precision

Digital Torquemeters

Installation, Operation, and Troubleshooting Guide

Customer:

Model Number:

Serial Number:

Factory Reference Number:

Horsepower at Max Rated Torque and Speed:

Maximum Rated Torque (lbf-in):

Low Range (if present) Torque Rating (lbf-in):

Torque Overload Capacity (lbf-in):

Overrange Rating: 150% on all outputs.

Maximum Speed (rpm):

Performance Code:

Foot Mount: ❑Yes ❑No

Speed/Horsepower: ❑Yes ❑No

Special Features:

Scaling, Units of Measure and Pin Assignments if Different Than Default

Torque Range(s):

Speed Range:

Power Range:

Filter Cutoff Requency (Hertz):

Password Protection [FIS = Off]: ❑On ❑Off

The attached Calibration Certicate lists actual calibration data. The calibration was done in Himmelstein’s NVLAP Accredited

Laboratory (NVLAP Lab Code 200487-0). For details, visit www.himmelstein.com or the ‘laboratory accreditation’ link @

www.nist.gov. Cal values are loaded on power up. Calibration data can be accessed using a PC and the supplied software.

& COMPANY

2490 Pembroke Avenue, Hoffman Estates, IL 60169 • 847-843-3300

www.himmelstein.com

Contents

I. Introduction ....................... 4

A. Mechanical Installation ............. 4

A.1 Applicability................................. 4

A.2 References .................................. 4

A.3 Coupling Selection ........................... 4

A.4 Coupling Installation.......................... 5

A.5 End-to-End Orientation........................ 5

A.5.1 Effect on Signal Polarity ..................... 5

A.5.2 Effect onTorquemeterThrust Capacity.......... 5

A.6 Vertical Installations & Belt/Chain Drives ......... 5

B. Electrical Installation ............... 6

B.1 Applicability ................................. 6

B.2 Stator Connectors ............................ 6

B.3 Wiring Cautions andTips ...................... 6

B.4 As Delivered Pin Connections .................. 6

B.5 Analog Output Default Pin Assignments Summarized... 7

B.5.1 Eight (8) Pin Connector: MCRT®48600V, 48800V,

48850V/48851V, 49800V, 59800V with

Speed/Power Option........................... 7

B.5.2 Eight (8) Pin Connector: MCRT®48600V, 48800V,

48850V/48851V, 49800V, 59800V without

Speed/Power Option........................... 7

B.5.3 Eight (8) Pin Connector: MCRT®79800V with

Speed/Power Option........................... 7

B.5.4 MCRT®79800V without Speed Option -

Default Pin Assignments ....................... 7

B.6 Cables...................................... 8

B.7 Calibration Function .......................... 8

B.8 Clockwise (CW) and Counterclockwise (CCW)

Denition .................................... 8

B.9Tare Function ................................ 9

B.10 Torque Zeroing .............................. 9

C. Operating & Safety Considerations .... 9

C.1 Applicability ................................. 9

C.2 AllowableTorque Loads ....................... 9

C.2.1 Overload Considerations..................... 9

C.2.2 Fatigue Considerations ...................... 9

C.2.3 Starting High Inertias with Electric Motors ...... 9

C.3 Allowable Bearing Loads ..................... 10

C.4 Allowable Extraneous Loads .................. 10

C.4.1 Allowable Bending Loads ................... 10

C.4.2 AllowableThrust Loads ......................11

C.5 Operating Speeds ............................11

C.6 High Speed Operation ........................11

C.7 Lubrication..................................11

C.7.1 Standard MCRT®Torquemeters ................11

C.8 Contaminants ...............................11

C.9 Hazardous Environments ......................11

D. PC Interface Software ............. 12

D.1 PC Interface Software Description .............. 12

D.2 Change Sensor Setup ........................ 12

D.3 Display Measured and Computed Data ......... 12

D.4Test Control ................................ 12

D.5 Perform Dead Weight Calibration .............. 12

D.6 Calibration Intervals ......................... 12

E. Troubleshooting................... 13

E.1 Scope ..................................... 13

E.2 Preliminary Inspection ....................... 13

E.2.1Transducer ................................ 13

E.2.2 Cabling and Earth Grounding ................ 13

E.2.3 Readout Instrument/Data Acquisition System/

Controller................................... 13

E.3Torque Subsystem ........................... 13

E.3.1 No Output WhenTorque is Present ............ 13

E.3.2 Constant Output Regardless of ShaftTorque .... 13

E.3.3 Apparent Zero Drift......................... 13

E.3.4 Signal Instability........................... 13

E.3.5 System Will Not Zero ....................... 13

E.4 Speed Subsystem ........................... 14

E.4.1 No Signal Output When Shaft is Rotating ...... 14

E.4.2 Erratic Output ............................. 14

E.4.3 Speed Pickup Replacement .................. 14

E.5 Power Subsystem ........................... 14

Appendix I: Detailed Specications ..... 14

Appendix II: Installed Units of Measure .. 14

Appendix III: Mating Stator Connector Part

Numbers .......................... 15

Appendix IV: Available Interconnect

Cables ............................ 15

Appendix V: Driving External Optical

Relays with Status Flags ............. 15

Appendix VI: Available Computer Port

Adapters .......................... 16

Appendix VII: Torquemeter to RS232

Computer Port Cabling ............... 16

Appendix VIII: Torquemeter to RS422

Computer Port Cabling ............... 16

Appendix IX: Foot Mounted Versus

Floating Shaft Installations ............ 17

Appendix X: Vertical Installations....... 17

Appendix XI: Fatigue Considerations .... 18

Appendix XII: High Speed Operation .... 18

Appendix XIII: Hazardous Environments . 19

Appendix XIV: Belt and Chain Drive

Considerations ..................... 19

Appendix XV: Serial Communications

for the Next Generation Torquemeter ... 20

Communication Port Settings..................... 20

General Conventions Used inThis Document........ 20

General information ............................ 20

These transducers measure and output shaft torque,

power and speed. Speed and power are optional. They

have no pots, switches or manual adjustments. Null,

scaling and units of measure are stored in non-volatile

memory. Digital computation of power is errorless.Thirty

three (33) common units of measure are supported. You

can select any supported unit of measure(s) without the

need to re-calibrate. Thirteen (13) selectable Bessel lters

avoid delay distortion and overshoot and assure optimal

measurement response in your application(s). Input

power is a single, unregulated dc supply. Reverse polarity

protection is standard.

If you re-calibrate, previous calibration values are archived.

Pin strapping and serial commands enable simultaneous,

traceable* torque/power/speed calibrations, remote tare,

tare clear, max/min reset and remote zeroing. Password

protection may be invoked if needed. Included interface

software operates on Windows-based PCs and displays

and plots real time data. Use it to select ±5V or ±10V

analog outputs, lter cutoff frequency, scaling, units of

measure, zero, tare, clear tare, store data, etc. and/or to

control measurements.

Strain gages sense torque on the rotor where it is digi-

tized and transmitted to stator circuitry. That circuitry

decodes and conditions the signals as scaled analog and

digital outputs. Both signal and power transfer is done

inductively, without brushes or any physical contact. The

transmission system doesn’t generate noise or wear and

is immune to ambient noise, vibration, lubricants and

other hostile environments.

Circuitry is shielded from RFI and external magnetic

elds which fact, combined with the absence of low

level cables, yields extraordinary noise immunity, even

close to large electric machines. Elimination of slip rings,

brushes, fragile ferrites, and other limited-life, noise-gen-

erating and noise susceptible elements further increases

performance and reliability. Moreover, the non-ferrite

design makes these transducers suitable for diesel and

other hostile applications.

* NIST traceable calibration performed in our accredited Cal Lab (NVLAP LAB

Code 200487-0). For details visit www.himmelstein.com or www.nist.gov.

I. Introduction

A. Mechanical Installation

A.1 Applicability

This discussion is applicable to all models.

A.2 References

MCRT®48800V, 49800V, 59800V, and 79800V transducers

are mechanically interchangeable with the MCRT®48000V,

49000V, 59000V and 79000V, DC Operated Torquemeter

models with the same full scale ranges and overload

ratings.That is, they share the same physical dimensions.

However, unlike the analog torquemeters, they:

• Use advanced digital technology to measure torque

and transfer it to the stator

• Have integral digital speed (an option) conditioning

and output circuitry

• Calculate shaft power (an option)

• Have no manual adjustments

• Output three 5V or 10V analog signals (user select-

able)

• Have thirteen selectable lter cutoff frequencies

• Have a full duplex RS232/422/485 port

• Come with PC interface software

• Have improved long term drift

• Support 33 mouse selectable units of measure.

These Torquemeters also have improved temperature

performance, overrange ratings, combined nonlinearity

and hysteresis, long term stability, wider bandwidth and,

when present, much faster power computations than

earlier models.

A.3 Coupling Selection

Your torquemeter installation method dictates the type of

coupling needed.There are two installation methods, i.e.,

a oating shaft and a foot mount.

Floating shaft installations are applicable to both shaft

and anged type torquemeters. A single ex coupling is

installed at each shaft end. It takes out angular misalign-

Single-Flex

Couplings

Flexible

Restraining

Strap

Torquemeter Installed

as Floating Shaft

Driver

Load

Figure 1. Floating Shaft Installation

Driver

Double-Flex

Couplings

Foot Mounted

Torquemeter

Load

Figure 2. Foot Mounted Installation

To Avoid Damage Or Injury

• Use xturing to support the hot shaft.

• Use insulated gloves when handling hot parts.

• Stop the hub installation if the pressing force exceeds

a few pounds. Remove the coupling. Cool all parts,

and then inspect for burrs on the coupling bore, shaft,

keys and keyways. If the parts are burr free, check the

bore size and verify the coupling keyway squareness.

• Don’t allow uids to enter the torquemeter.

A.5 End-to-End Orientation

A.5.1 Effect on Signal Polarity

MCRT®torquemeters are bi-directional. Their output

signal polarity reverses when the direction of transmitted

torque reverses. Himmelstein uses the following conven-

tion for dening torque direction.

CWTorque: the shaft turns CW, when viewed from

the driven end

CCWTorque: the shaft turns CCW, when viewed from

the driven end

Reversing a torquemeter end-for-end doesn’t change the

torque direction or magnitude. Therefore, it will have no

effect on the torquemeter output signal. When in doubt

about shaft torque direction, observe the output signals

during normal machine operation. A positive signal

output indicates CW torque per the above denition. A

negative output signal signies a CCW torque.

Torque signal polarity is xed at the factory and is not

eld changeable.

A.5.2 Effect on Torquemeter Thrust Capacity

Orienting a foot mounted torquemeter per Figure 3 will

provide increased uni-directional thrust capacity. Because

dynamic thrust loading is usually bi-directional, it’s safest

to limit bearing axial (thrust) loads per ¶ C.3. Orienta-

tion does not affect the thrust capacity of torquemeters

installed as oating shafts.

When axial bearing loads are uni-directional, the orien-

tation illustrated in Figure 3 increases the unidirectional

thrust rating by a factor of four (4). Remember, the

increased uni-directional rating applies only to optimum

orientation of foot mounted torquemeters.

A.6 Vertical Installations & Belt/Chain Drives

Vertical installations frequently require special mounting

and coupling selection considerations. See Appendix X for

vertical installations and Appendix XIV for belt/chain drives.

ment, and the torquemeter “tilts” to take out parallel

misalignment. Use a exible strap to prevent housing

rotation and to strain relieve the torquemeter electrical

cable. Caution: If electrical connections are run in a short,

rigid conduit, you must foot mount the torquemeter.

Alternately, use exible conduit and single ex couplings.

Install a foot mounted torquemeter between double ex

couplings as shown.The double ex couplings accommo-

date both parallel and angular misalignments.

Appendix IX discusses the choice of a foot mounted or

a oating shaft installation. It also contains additional

comments on coupling selection. For either installation

method, choose couplings that will handle the:

• Expected shaft end oat

• Parallel and angular misalignments

• Maximum expected shaft speed

• Maximum expected shaft torque

• Expected extraneous loading.

A.4 Coupling Installation

Use a slight interference t (0.0005 inches per inch of shaft

diameter) and follow the coupling manufacturers’ instruc-

tions. Before installation, lightly coat the torquemeter shaft

with an anti-seizing compound suitable for use at 400 deg.

F. Next, heat the coupling hub, not the torquemeter, to

approximately 400 deg. F. Then, install the coupling.

The heated coupling hub should “slip” on the torquemeter

shaft without signicant resistance.That is, coupling instal-

lation force shouldn’t exceed 10% of the axial load tabulated

in ¶ C.3. Next, allow the assembly to cool to room tempera-

ture.Then, repeat the process for the second coupling.

If desired, use forced air to accelerate cooling. Air cooling

avoids contaminating the torquemeter with anti-seizing

compound. If cooling is speeded with water dampened

rags, orient the torquemeter to prevent entry of water

mixed with anti-seizing compound. Otherwise, internal

damage can occur.

After coupling installation, verify that:

• Clearance exists between the coupling and the

torquemeter stator, and

• The shaft-to-coupling t is snug enough to prevent

vibration induced coupling motion.

Option Z Speed Pickup

Preferred Thrust Direction

➨

Figure 3. PreferredThrust Path

B. Electrical Installation

B.1 Applicability

This section is applicable to all MCRT®48600V,

48800V, 48850/48851V, 49800V, 59800V and

79800V Ultra Precision DigitalTorquemeters.

B.2 Stator Connectors

Four connectors as follows: one 10 pin, one 8

pin, and twin (2) 6 pin connectors. If ordered

without readouts, one each 10, 8 and 6 pin

mating connector is supplied. A connector

terminated, RS422 twenty foot Com Port to PC

cable is also furnished.The following tables list

pinouts for the 4 user connectors.

Note: to invoke a command, ground the

control pin or drive it with a logic zero.

Output ags are Low (0V) when within

rating and High (3V) if outside rating;

see Appendix V if you wish to drive an

external optical relay.

B.3 Wiring Cautions and Tips

Reverse polarity protection is standard. Although any wire

may be used, shielded cable performs best in noisy envi-

ronments and is strongly recommended.The shield should

oat at theTransducer, tie the other end to earth ground.

• Caution: Don’t connect a Transducer to a Power

Supply that also drives inductors or solenoids.

Induced switching transients may cause damage or

noise.

• Connect the transducer stator directly to earth

ground – a building’s structural steel or a oor rod. If

neither is available, drive a six foot copper rod into

the oor. Then run separate ground straps between

it and the test stand components as shown in the

sketch. Don’t “daisy chain” the connections; see

Figures 4 and 5.

• If an IGBT-based variable frequency drive (VFD) is

used, follow its installation manual. Improperly

installed VFDs can cause premature motor and

cable failures, as well as reading errors from exces-

sive noise. VFDs should have shielded power and

motor cables. Belden Types 29500 thru 29507cable

are designed for VFD use. See “Cable Alternatives

for PWM AC Drive Applications” at www.belden.

com. Use the connections shown in Figure 20 of

that document. For best results in noisy environ-

ments, use a differential input amplier and the

differential output conguration.

B.4 As Delivered Pin Connections

Unless specied in the customers’ order, Torquemeters

are delivered with the default pin connections dened in

¶ B.2 and expanded in ¶ B.5. If specied differently, the

connections are dened on the manual front page or in

an equivalent document.

10 Pin Connector Pinout

Function Pin

Invoke Clockwise Calibration A

Tare Data B

Clear Tare C

Ground Return D

+ Power Input (10 to 26 VDC) E

Resets Max/Mins F

Temperature Status. See Appendix V if you wish to drive an optical relay. G

Torque Status. See Appendix V if you wish to drive an optical relay. H

Speed Status. See appendix V if you wish to drive an external optical relay. J

Invoke Counterclockwise Calibration. K

Twin 6 Pin Connector Pinouts

Function Pin

+ TXD A

Ground for RS422/485, Open for RS232 B

Ground C

- RXD or TXD D

+ RXD or RXD E

- TXD F

Both identical connectors are wired in parallel to facilitate RS485 connections to

multiple Torquemeters. Either connector may be used for RS232 or RS422 service.

The terms TXD and RXD apply to RS232 applications. The terms ±TXD and .±RXD

apply to RS422 and RS485 applications.

8 Pin Connector Pinout

Function Pin

Speed Analog Out (±10V) A

Power Analog Out (±10V) B

Analog Signal Ground C

+ Power Input (10 to 26VDC) D

Invoke Clockwise Calibration E

Invoke Counterclockwise Calibration F

Torque Analog Out (±10V) G

Digital Ground/Power Return H

Default pinout is shown; it assumes Option Z is present. Default without Option Z

is: Pins A and B are +5V and -5V Torque analogs thus, they provide a differential

±10V torque output. Pin G remains a ground referenced ±10V torque signal.

Load Device

Torquemeter

Drive Motor

Earth Ground

DAS/Controller

Machine Base

Note: Use separate ground straps

Load Device

Torquemeter

Drive Motor

Earth Ground

DAS/Controller

Machine Base

Load Device

Torquemeter

Drive Motor

DAS/Controller

Machine Base

Figure 4. Correct System Earth Grounding

Figure 5. Examples of Incorrect Earth Grounding

B.5 Analog Output Default

Pin Assignments Summarized

Unless requested differently, units are shipped with

the default pin assignments listed below. The user may

re-assign any three analog output signals present in any

combination. For example, using the supplied software,

if Torque, Speed and Power outputs are present (Code Z

Option), you can outputTwoTorque Signals and Power, etc.

B.5.1 Eight (8) Pin Connector: MCRT®

48600V, 48800V, 48850V/48851V, 49800V,

59800V with Speed/Power Option

Pin A +10V Speed Output

Pin B ±10V Power Output

Pin G ±10VTorque Output

Pin C Analog Ground

B.5.2 Eight (8) Pin Connector: MCRT®

48600V, 48800V, 48850V/48851V, 49800V,

59800V without Speed/Power Option

Pin A

5VTorque Output

Pin B ±5VTorque Output

Pin G ±10VTorque Output

Pin C Analog Ground

B.5.3 Eight (8) Pin Connector: MCRT®

79800V with Speed/Power Option

Pin A +10V Speed Output

Pin B ±10V Low RangeTorque Output

Pin G ±10V High RangeTorque Output

Pin C Analog Ground

B.5.4 MCRT®79800V without Speed Option -

Default Pin Assignments

Pin A ±10V Low RangeTorque Output

Pin B ±5V High RangeTorque Output

Pin G ±10V High RangeTorque Output

Pin C Analog Ground

B.6 Cables

Shielded cables should be used to avoid noise pickup.The

shields should oat at theTorquemeter end and all should

be terminated at a single earth ground. Don’t run trans-

ducer cables in close proximity to power lines.

Figure 6 illustrates cable connections for multipleTorque-

meters with Option Z, conditioned Speed and Power

Outputs, to a host computer with an RS232 port. If the

computer has an RS422 port, a converter isn’t needed. For

computers with USB ports see Appendix VI.

B.7 Calibration Function

These Torquemeters have rotor side, bi-polar shunt cali-

bration. That is, a stable, precision resistor is shunted

across the torque bridge in response to a user initiated

command. The resultant Cal signal is referenced to the

factory dead weight torque calibration and, is NIST trace-

able. Thus, when invoked, it permits calibration of the

users’ data acquisition system, traceable to NIST. Further-

more, it permits verication of the entire data chain in

both the CW and CCW directions.

Calibration may be invoked from your PC using the

supplied interface software. Alternately you can invoke

calibration by grounding pins as follows:

CW Calibration: ground Pin A on the 10 pin connector,

or ground Pin E on the 8 pin connector.

CCW Calibration: ground Pin K on the 10 pin connector,

or ground Pin F on the 8 pin connector.

Invoking a Cal Check produces simultaneous calibration

signals for all outputs, i.e,Torque and, with Option Z present,

Speed and Power.The calibration signal will remain on until

the short is released. For that reason it should be invoked

while the driveline torque is at zero; if locked-in torque is

present, break one of the shaft couplings.

Always remove the Cal Check command before running

a test.

Equivalent calibration values are listed on the Calibration

Certicate which documents NIST traceability*. They can

also be accessed using the furnished software. Calibration

values are determined in S. Himmelstein and Company’s

accredited* (NVLAP Lab Code 200487-0) calibration labo-

ratory. The user may perform a dead weight calibration

and store the results in memory, using furnished soft-

ware.The original cal data is archived.

B.8 Clockwise (CW) and

Counterclockwise (CCW) Denition

CWTorque causes the shaft to turn CW when viewed from

the driven end. CCWTorque causes the opposite rotation.

Power polarity tracks the torque. Himmelstein uses the

following polarity denitions:

CWTorque produces a positive output signal.

CCWTorque produces a negative output signal.

When theTorque is CW, the Output Power is positive.

When theTorque is CCW, the Output Power is negative.

Speed Output is always positive.

* For details visit www.himmelstein.com or follow the accreditation link

at www.nist.gov.

RS232 to RS422/485 Converter

330-0001

TXD

RXD

GND

RS485/TS232

TXD

RXD

GND

RS485/RS232

RXD

TXD

GND

RXD

TXD

GND

120

224-8360-XX (3PR, SHLD, 22AWG)

224-8381-XX (3PR, SHLD, 22AWG)

120

Software

switched

120

Software

switched

Two identical 6 pin

connectors are

wired inparallel.

Two identical 6 pin

connectors are

wired in parallel.

For cable runs greater than 500 feet,

terminate RXD data signal at the

computer and the Torquemeter at

the furthest end with 120Ω. Termination

resistors areincluded on Torquemeter

and can be switched inand out with

the supplied software.

When connecting multiple

torquemeters to a singe

computer, youmust assign a

unique ID toeach Torquemeter.

This can be done with the

supplied software.

Connect similarly

to up to 32

Torquemeters

TXD

RXD

GND

RS485/TS232

TXD

RXD

GND

RS485/RS232

Computer RS232 Torquemeter #1

Torquemeter #2

Figure 6. Cable Connections for Multiple Torquemeters to a Single Host Computer

C. Operating & Safety Considerations

C.1 Applicability

The following paragraphs apply to all MCRT®products.

C.2 Allowable Torque Loads

Operate an MCRT®Torquemeter within its full scale; see

booklet cover for rating of this device.

C.2.1 Overload Considerations

The overload rating of an MCRT®Torquemeter is usually

2 times (Series 48800V), 4 times (Series 49800V) or 10

times (Series 59800V) full scale, but can be lower. This

torquemeter’s overload rating is listed on the cover sheet.

A Himmelstein torquemeter will not yield (evidenced by a

non-return to zero) or fail if subjected to an instantaneous

peak torque up to its overload value.

Both the full scale and overload ratings are based on the

peak stress seen by the transducer.They are independent

of stress duration, except for cyclical (or fatigue) loading

considerations; see ¶ C.2.2. Virtually all rotary power

producing and absorbing devices produce pulsating

rather than smooth torque and power.

Thus, in addition to its average torque and speed values,

the driveline torque usually includes a fundamental

(driving) frequency and superimposed harmonics.

Torsional vibration magnitudes can be amplied by the

driveline. See Technical Memorandum 8150 for further

information. The Figure 7 waveform is typical of what

occurs in the real world.

For these reasons, a conservative design approach

dictates the torquemeters’ overload => twice the prob-

able peak torque. Reserve the region between the peak

instantaneous torque and the torquemeters’ overload

rating as a safety margin for unexpected loads. Do not

knowingly operate in the overload region. If you expect

torques in the overload region, then change to a torque-

meter with a higher overload rating.

C.2.2 Fatigue Considerations

If the peak torque seen by an MCRT®torquemeter is less

than half its overload rating, it can handle full torque

reversals with innite fatigue life. When peak torques

are cyclical, and exceed 50% of the overload rating, then

fatigue failure can occur. Refer to Appendix XI for addi-

tional details.

C.2.3 Starting High Inertias with

Electric Motors

When started across the line, during the start, a motors’

developed torque can be several times its rated torque.

Thus, a Torquemeter sized to handle the motors’ rated

load torque, can be overloaded during starting. Drivelines

are particularly vulnerable when oversized motors drive

light duty, high inertia loads.

B.9 Tare Function

TheTare function is intended to cancel or “zero” a residual

value that is not due to a permanent shift in the Torque-

meter itself. For example, if you are interested in seeing

the result of a transmission shift, you canTare the running

Torque before the shift and then see the resultant shift

torque.

Caution: Unless you remove the Tare Value, by using the

ClearTare function, subsequent readings will be in error due

to the residualTare.Tare values are deleted when power is

turned off.TheTare and ClearTare functions can be invoked

from a remote PC with the software furnished. They can

also be invoked by driving control pins, as follows:

InvokeTare by grounding Pin B of the 10 pin connector.

Clear Tare by grounding Pin C of the 10 pin connector.

B.10 Torque Zeroing

The Zero function is intended to correct a minor long term

drift or slight yield in the torquemeter itself. TORQUE

ZEROING SHOULD ONLY BE DONEWHENTHE DRIVELINE

TORQUE IS ZERO. If locked-in torque is present, break one

of the shaft couplings to remove it before attempting to

Zero the Torquemeter. Should the Torquemeter Zero shift

by more than 1% of the Torquemeter Full Scale Rating,

return the Torquemeter to the factory for re-calibration

and/or service, if indicated. Zero adjustments are retained

during power off and automatically accessed when power

is re-applied.

The Zero function can only be accessed using the supplied

software.

Peak Torque = Tp

Tp ÷ Ta = 1.18

Torque

Ø Time

Average Torque = Ta

Figure 7. Reciprocating MachineTorque Prole

These results are achieved, in part, by providing optimum

bearing pre-load. A lower pre-load would degrade high speed

performance. A higher preload would increase bearing friction

torque, increase measurement error, and reduce bearing life.

In a oating shaft installation, the stator must be exibly

restrained so total loads, including the stator restraint and

shaft runout, don’t exceed its bearing rating. A stranded

wire or braided cable will provide this exible restraint

and strain relieve the electric cable.

When the stator is foot mounted, the coupling end oat

must be sufcient to take up axial shaft motions and

hold the bearing loads within the limits specied in the

following table.

When using torquemeters in belt/chain drives, pillow blocks

are usually needed to isolate them from radial bearing and

bending loads (see ¶ C.4). Consider pulley or wheel type

torque sensors for such service. Their bearings are isolated

from the belt loads, and they accept large radial and bending

loads without damage or measurement errors.

C.4 Allowable Extraneous Loads

Any moment or force theTorquemeter sees, other than the

transmitted torque, is an extraneous load. Depending on

the installation, these could include bending moments and

axial thrust. Crosstalk errors from such loads, expressed in

pound-inches, are typically 1% of the applied pound-inches

of bending or, 1% of the applied pounds of thrust.

C.4.1 Allowable Bending Loads

When it is applied without thrust, a standard MCRT® Torque-

meter, mounted as a oating shaft, can handle a shaft

bending moment equal to one half its torque rating. Such

bending may be applied simultaneously with rated torque.

The allowable bending input to a foot mounted torque-

meter (Figure 9) is dictated by its bearing radial load

ratings (see ¶ C.3), and by the need to prevent coupling

“lock-up”. When a coupling locks-up, it no longer provides

one or more needed degrees of freedom and, ultimately

causes a driveline failure.

CAUTION

Use pillow blocks to isolate a foot mounted torquemeter

from excessive bending and radial loads.When applying

such loads, don’t exceed a torquemeters’ bearing load

ratings; see Appendix IX for explicit details.

Torquemeter

Driver

J1 Load

J1 & J2 Are Rotating Inertias

Peak Starting Torque = Ts Ts ÷ Tr = 2.7

Rated (Average) Torque = Tr

Across-The-Line Start J2>>J1

Time

Torque

Figure 8. Motor StartTorque Prole

Shaft Type Digital Torquemeter Loads

Function

Bi-directional Bearing Load

Axial (lbs) Radial (lbs)

MCRT®48600V 3 5

MCRT®48801/49801/59801/79801V 15 30

MCRT®48802/49802/59802/79802V 30 80

MCRT®48803/49803/59803/79803V 35 100

MCRT®48804/49804/59804/79804V 35 100

MCRT®48806/49806/59806/79806V 55 150

MCRT®48807/49807/59807/79807V 70 200

MCRT®48808/49808/59808/79808V 80 200

MCRT®48850/48851V 30 100

Double-Flex

Couplings

Foot Mounted

Torquemeter

Blower Wheel

Under Test

Weight of Blower

Wheel Applies

Bending Load

Figure 9.Torquemeter with Bending Load

To avoid damage when starting high inertia loads, use

a torquemeter rated for the starting torque or, limit the

starting torque to a safe value.Techniques to limit electric

motor starting torques include:

• Use reduced voltage starting.

• Electronically limit the maximum motor current.

• Add inertia to the input side of the torquemeter.

Before operating, verify the motor can safely start

the increased load inertia.

• Use “shock absorbing” couplings. Careful coupling

selection and thorough analysis is essential. Under

some conditions, such couplings can aggravate

rather than improve the situation.

C.3 Allowable Bearing Loads

MCRT®Torquemeter bearing design provides long life, smooth

running, and avoids bearing torque measurement errors.

This manual suits for next models

Table of contents

Other Himmelstein Measuring Instrument manuals

Himmelstein

Himmelstein 2270V Operating instructions

Himmelstein

Himmelstein MCRT 48200V User manual

Popular Measuring Instrument manuals by other brands

Suaoki

Suaoki D40 user manual

Elster

Elster BK-G1.6 operating instructions

Endress+Hauser

Endress+Hauser Deltabar FMD71 technical information

Duratool

Duratool D03128 manual

Vega

Vega VEGAPULS 65 Quick setup guide

Tonghui

Tonghui TH2618B Operation manual

Tenmars

Tenmars TM-801 user manual

MSR

MSR 145 user manual

TPS

TPS WP-82 manual

ELMETRON

ELMETRON CP-511 user manual

PCB Piezotronics

PCB Piezotronics 003C30 Installation and operating manual

Tenma

Tenma 72-10465 manual

Endress+Hauser

Endress+Hauser Proline Promag 50 Brief operating instructions

Siemens

Siemens SITRANS F Coriolis FCT030 Function manual

KLINGER

KLINGER CMF V Series instruction manual

EXFO

EXFO FTB-2 Notice

Keysight

Keysight M8290A Getting started guide

ADTEK

ADTEK MW-5 operating manual