Partlow MRC 7800 User manual
Installation, Wiring, Operation Manual
MRC 7800
ONE AND TWO PEN CIRCLE CHART FLOW RECORDER
QUALITY INSTRUMENTATION DESIGNED & MANUFACTURED IN THE U.S.A.
PAGE 2
nformation in this installation, wiring, and operation
manual is subject to change without notice. One
manual is provided with each instrument at the time of
shipment. Extra copies are available at the price published
on the front cover.
Copyright © October 1997, The Partlow-West Company, all
rights reserved. No part of this publication may be repro-
duced, transmitted, transcribed or stored in a retrieval sys-
tem, or translated into any language in any form by any
means without the written permission of the Partlow-West
Company.
This is the Seventh Edition of the MRC 7800 Flow Recorder
manual. It was written and produced entirely on a desk-
top-publishing system. Disk versions are available by writ-
ten request to the Partlow Advertising and Publications
Department.
We are glad you decided to open this manual. It is written
so that you can take full advantage of the features of your
new MRC 7800 Flow Recorder.
I
PAGE 3
TableofContents
SECTION1-GENERAL PageNumber 1.1
Product Description 5
SECTION2-
INSTALLATION&WIRING
2.1 Installation & Wiring 7
2.2 Unpacking 7
2.3 Location 7
2.4 Mounting 7
2.5 Preparation for Wiring 8
2.6 Wiring Connections 9
SECTION3-GENERALOPERATION
3.1 How the instrument operates 14
SECTION4-
CONFIGURATION&OPERATION
4.1 Configuration Introduction 18
4.2 Shipped Configuration / Jumper Positioning 19
4.3 Operation Summary 19
4.4 Start Up Procedure 20
4.5 Configuration & Operation 21
4.6 Data Logger Display Mode 32
SECTION5-SERVICE
5.1 Service 34
5.2 Changing Charts 34
5.3 Changing Pens 34
5.4 Calibration 35
5.5 Test Mode 37
5.6 Troubleshooting and Diagnostics 40
APPENDICES
A - Board Layouts
A-1 Processor Board 46
A-2A Relay (SPST) Output Board 47
A-2B Relay (SPDT) Output Board 48
A-3 Current Output Board 49
B - Glossary 50
C - Model Number Hardware Matrix Details 52
D - Specifications 53
E - Software Record/Reference Sheet 55
Warranty Inside Back Page
PAGE 4
FIGURES&TABLES
Figure 1-1 Front View 5
Figure 1-2 Display Features 6
Figure 2-1, Panel Dimensions 8
Figure 2-2 Board & Terminal Locations 9
Figure 2-3 AC Power Input 10
Figure 2-4 Volt, millivolt, & milliamp Input 11
Figure 2-5 Transmitter Power Supply Input 11
Figure 2-6 Remote Reset Input 12
Figure 2-7A Relay Output (SPST) 12
Figure 2-7B Relay Output (SPDT) 13
Figure 2-8 SSR Driver Output 13
Figure 2-9 Current Output-Standard 13
Figure 4-1 Keypad Features 19
Figure 5-1 Changing Pens 34
Table 3-1 Variable exponents of Parshall flumes 16
Table 3-2 Totalizer Factor 17
Table 3-3 Totalizer Factor Example 17
Table 4-1 Enable Mode Configuration Procedure 25
Table 4-2 Program Mode Configuration Procedure 26
Table 4-3 Alarm Set Mode Configuraton Procedure 30
Table 4-4 Data logger Setup Mode Configuration 30
Table 4-5 Preset Adjust Mode Configuration 31
Table 4-6 Data logger Display Mode Configuration 33
Table 5-1 Calibration Procedure 35
Table 5-2 Test Procedure and Description 37
PAGE 5
ProductDescription1.1
1.1.1 GENERAL
The instrument is a microprocessor based circular chart recorder capable of measuring,
displaying, recording, and datalogging flow process variables. Three square root extraction
algorithms are available for use with a variety of transmitters and transducers, and four
algorithms are available for use with a variety of weirs and flumes.
Recording functions, alarm settings, and other parameters are easily entered via the front
keypad. All user data can be protected from unauthorized changes by the Enable mode
security system, and is protected against loss from AC power failure by battery back-up.
The process input for each pen is user configurable to directly connect to either mVDC, VDC,
or mADC inputs. Changes in input type are easily accomplished in the field. The unit's
process input is isolated from the rest of the unit. An isolated 24VDC regulated transmitter
power supply can be provided for use with two-wire mADC inputs.
The unit can be ordered for either 115VAC or 230VAC power at 50/60Hz. The 230VAC
option includes a switch for changing back and forth between 230VAC and 115VAC. The unit
is housed in a plastic enclosure suitable for panel or surface mounting.
1.1.2 RECORDING
The unit incorporates a 10 inch circular chart. One box of standard charts is provided with
each unit. Charts are available in a wide selection of ranges. Chart rotation speed is
programmable from 0.1 to 999.9 hours per revolution in 0.1 hour increments. The instrument
can be provided with one or two pens. Pen 1 is red and Pen 2 is green. Pens are of the
disposable fiber-tip type. Changes in pens, as well as charts, are quickly and easily accom-
plished.
A programmable chart/display filter is provided. This filter provides adjustable dampening of
the value displayed and recorded. The filter need not be used. (Configured in program mode
as "dFF," Display Filter Factor.)
FIGURE1-1
Keypad
Scroll Key
Up Key
Down Key
PEN 1 DISPLAY
PEN 2 DISPLAY
Pen 1
Auto/Manual
Key
Pen 2
Auto/Manual
Key
Display
Select Key
PAGE 6
1.1.3 DISPLAYS
Each unit is provided with an eight character digital display and status indicators for each pen
provided. The display provided in the upper right corner is for Pen 1, and the display in the
lower right corner is for Pen 2. Status indication is provided for Alarm 1 and Alarm 2. The
display is programmable for none, one, two or three decimal places for process value and
total, with additional scaling ability for the total. The second display is also optional on one
pen units with totalization for simultaneous display of the process value and total.
1.1.4 ALARMS
Alarm indication is standard on all units. Alarm settings are fully programmable. Alarm type
may be set as Process high or low. Indication is via status LED's provided for each pen.
Alarm outputs can be provided by assigning any specified relays (SPST, SPDT or SSR driver)
to the respective alarm.
1.1.5 PROCESSVALUEOUTPUT
If a unit is specified with 4 to 20 mADC outputs, these outputs may be programmed to
operate as a Process Value Output. As such, the output is scaleable.
FIGURE1-2
TOT
PV
ALRM1 ALRM2
PAGE 7
Installation&Wiring 2.1
CAUTION: TheInstrumentACpowerinput is as specified in the model number; 115VAC or230VAC. VerifytheACpower
inputprovidedwiththeinstrument prior to proceeding with installation.
Read these instructions carefully before proceeding with installation and operation. Electrical
code requirements and safety standards should be observed. Installation should be per-
formed by qualified personnel.
Unpacking 2.2
Remove the unit from the carton and inspect it for any damage due to shipment. If any
damage is noticed due to transit, report and file a claim with the carrier. Write the model
number and serial number of the unit on the inside of the front cover of this Operation Manual
for future reference when corresponding with the factory.
Location 2.3
Locate the instrument away from excessive moisture, oil, dust, and vibration. Do not subject
the instrument to operating temperatures outside of 0 to 55° C.
Mounting 2.4
Figure 2-1 (page 8) shows installation view and physical dimensions for a panel mounted
unit.
The panel that the unit will be mounted in must provide rigid support for the approximately 20
pound unit . Adjacent units may be mounted within a minimum of 2 inches horizontally and 3
inches vertically, providing that proper panel support is supplied.
PANEL MOUNTING HARDWARE REQUIRED: (not provided with instrument)
(4) 9/32" x 2" bolts w/nuts
(4) appropriate lockwashers
PANEL MOUNTING:
1) Cut panel hole to dimensions shown in Figure 2-1 (page 8).
2) If the rear of the panel is accessible for wiring after mounting, place the unit in the
panel cutout and fasten it to the panel through mounting holes supplied in the case
flange.
3) If the rear of the panel is not accessible for wiring, proceed with wiring preparation and
wiring, then mount the unit.
SURFACE MOUNTING:
1) If surface mounting is required, use Kit # 64402001 (ordered separately) Install mounting
brackets on sides of case and mount on the mounting surface.
PAGE 8
FIGURE2-1
PreparationforWiring 2.5
2.5.1 WIRINGGUIDELINES
Electrical noise is a phenomenon of the typical industrial environment. The following are
guidelines that must be followed to minimize the effect of noise upon any instrumentation.
2.5.1.1 INSTALLATION
Listed below are some of the common sources of electrical noise in the industrial environ-
ment:
* Ignition Transformers
* Arc Welders
* Mechanical contact relays
* Solenoids
* Motors
Before using any instrument with devices listed previously, the instructions below should be
followed:
1. If the unit is to be mounted in the same panel as any of the listed devices, separate them
by the largest distance possible. For maximum electrical noise reduction, the noise
generating devices should be mounted in a separate enclosure.
2. If possible, eliminate mechanical contact relays and replace them with solid state relays. If
a mechanical relay being powered by the unit's output device cannot be replaced, you may
wish to use a solid state relay to isolate the instrument from this source of noise.
3. A separate isolation transformer which feeds only instrumentation should be considered. If
available, it can isolate many noise sources from the AC power input of the unit.
4. If the unit is being installed in an existing installation, a review of the wiring in the existing
area should be done.
12 5/8
7 1/2
13 1/2
(342.5 mm )
13 15/16
(354 mm)
(5.5 mm)
9/32
DIA.(7.1mm)
15 1/8
(384.2
mm).
(64 mm)
WIDTH OF COVER
4 11/16
(119.1 mm)
13 3/16
(335 mm)
Mounting
Bracket (2)
2 19/32
(65.9mm)
EC1
EC2
EC3
EC4
(320.7
mm) (190.5
mm)
7/32
3 3/4
(92.3 mm)
PAGE 9
2.5.1.2 AC POWER WIRING
Earth Ground
Each unit includes noise suppression components attached to the chassis that require an
earth ground connection. To verify that it is earth ground being attached, make a resistance
check from instrument chassis to the nearest metal water pipe or proven earth ground. This
reading should not exceed 100 ohms.
Neutral (For 115 VAC)
It is good practice to assure that the AC neutral is at or near ground potential. To verify this, a
voltmeter check between neutral and ground should be done. On the AC range, the reading
should not be more than 50 millivolts. If it is greater than this amount, the secondary of this
AC transformer supplying the instrument should be checked by an electrician. A proper
neutral will help ensure maximum performance from the instrument.
2.5.1.3 WIRE ISOLATION
The instrument is designed to promote proper separation of the wiring groups that connect to
the instrument. The AC power wire terminals are located near the top of the instrument
boards. The analog signal terminals are located near the bottom of the intrument boards.
Maintain this separation of the wires to insure the best protection from electrical noise. If the
wires need to be run parallel with any of the other lines, maintain a minimum 6 inch space
between the wires. If wires must cross each other, do so at 90 degrees. This will minimize the
contact with each other and reduces "cross talk". "Cross talk" is due to the EMF (Electro
Magnetic Flux) emitted by a wire as current passes through it. This EMF can be picked up by
other wires running in the same bundle or conduit.
2.5.1.4 USE OF SHIELDED CABLE
Shielded cable helps eliminate pickup of noise the wires may be exposed to. Shielded cable
is a single or multi-pair of insulated wires with each wire or pair of wires surrounded by a wire
mesh or conductive foil and then covered with plastic insulation.
It is recommended that all analog signals be run with shielded cable. Connection lead length
should be kept as short as possible, thus keeping wires protected by the shielding. The shield
should be grounded at one end only, at the transmitter or transducer and the shield should be
stripped back before going inside the unit case .
WiringConnections2.6
All wiring connections are typically made to the unit with it installed. Connections should be
made at the terminal blocks, two 12 gauge wires maximum, using copper conductors only.
Terminal blocks are designated TB1 thru TB13. See Figure 2-2 for the terminal block
locations.
FIGURE2-2
TB3 TB4 TB5
TB1
12
1 2 1 2 3 4 5 1 2 3 4
5
1 2 3 4 1 2 3 4 1 2 3
4
TB6 TB7 TB8
TB9
1 2 3 4
RELAY/SSR Driver
Board
TB10 TB11 TB12 TB13
1 2 1 2 1 2 1
2
Current Output Board
Processor Board
TB 2
1 2
PAGE 10
2.6.1 ELECTRICALCONDUITOPENINGS
The instrument case will have 3 or 4 conduit openings, depending upon the number of outputs
specified. To help minimize electrical noise that may adversely affect the operation of the
instrument, the wires indicated below should be routed through the conduit opening specified.
See Figure 2-1 (page 8) for conduit opening locations.
EC1 - AC power
EC2 - Analog input and mAdc outputs
EC3 - SPST, SPDT relay or SSR driver outputs
EC4 - SPST, SPDT relay or SSR driver outputs
(provided when > 4 relays & SSR's are specified)
Unused conduit openings should be sealed if exposed to the environment.
2.6.2 ACPOWERWIRINGCONNECTIONS
WARNING: ToavoidelectricalshockAC power wiring must not be
connectedatthesourcedistribution panel until all wiring connections are completed.
FIGURE2-3
AC Instrument Power Input
Connect the 115 VAC hot and neutral to terminals 1 and 2 respectively of TB1. See Figure 2-
2 (page 9) for Terminal Board locations on the instrument. Connect the 230 VAC one leg to
each terminal, be sure to check the position of the Voltage Selector switch provided with 230
VAC instruments. The switch position must match the voltage input to the instrument.
12
TB1
Connect the AC
ground at the
green ground screw
on the left side of
the inside of the
case
Line 1 Line 2
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