Bosch Rexroth VT-MRMA1-1 User manual

Operating instructions

RE 30214-B/03.2019

Replaces: 03.2017

English

VT-MRMA1-1

Analog ampliﬁer module

The data speciﬁed only serve to describe the

product. No statements concerning a certain

condition or suitability for a certain application

can be derived from our information. The

information given does not release the user

from the obligation of own assessments and

veriﬁcation. It must be remembered that our

products are subject to a natural process of

wear and aging.

speciﬁcations and other information set forth in

it, are the exclusive property of Bosch Rexroth.

It may not be reproduced or given to third

parties without its consent.

An example conﬁguration is shown on the title

page. The delivered product may, therefore,

diﬀer from the product which is pictured.

The original operating instructions were

created in the German language.

RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG

3/52Content

Content

1 About this documentation 5

1.1 Validity of the documentation 5

1.2 Required and supplementary documentation 5

1.3 Representation of information 5

1.3.1 Safety instructions 5

1.3.2 Symbols 6

1.3.3 Terms used 6

1.3.4 Abbreviations used 6

2 Safety instructions 7

2.1 About this chapter 7

2.2 Intended use 7

2.3 Improper use 7

2.4 Personnel qualiﬁcations 7

2.5 General safety instructions 8

2.6 Product-speciﬁc safety instructions 8

3 General notes on damage to material and the product 10

4 Scope of delivery 11

5 About this product 12

5.1 Performance description 12

5.1.1 Block circuit diagram of the controller structure of the analog ampliﬁer

module: 13

5.2 Product description 13

5.2.1 Components that can be connected 13

5.2.2 Function 14

5.2.3 Functions within the ampliﬁer module 15

5.2.4 Controller and functions closely related to the controller 16

5.2.5 Actual value preparation 17

5.2.6 Monitoring functions 19

5.2.7 Measuring point changeover switch (15) 22

5.3 Identiﬁcation of the product 22

6 Transport and storage 23

6.1 Storing the VT-MRMA1 23

7 Installation 24

7.1 Installation conditions 25

7.2 Required tools 25

7.3 Recommended accessories 26

7.4 Installing the VT-MRMA1 26

7.5 System-speciﬁc circuitry of the ampliﬁer module 27

7.6 Overview of connections 27

7.6.1 Terminal assignment 28

7.6.2 Connection of the power supply unit 29

7.6.3 Connection of the pressure reducing valve 29

7.6.4 Connection of actual pressure value cables (pressure transducer) 30

7.6.5 Connection of the control 31

7.6.6 Plug-in screw connectors 31

8 Commissioning 33

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Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019

8.1 Adjustment, measuring and indicator elements 33

8.1.1 DIL switches 33

8.1.2 Potentiometers 37

8.1.3 Measuring signal and measuring point selector switch 38

8.1.4 LEDs 38

8.2 Commissioning instructions 39

8.3 Fine tuning of the complete system 40

8.4 Application example 41

9 Operation 43

10 Maintenance and repair 43

10.1 Cleaning and care 43

10.2 Maintenance 43

10.3 Repair 43

11 Demounting and replacement 44

11.1 Preparing demounting 44

11.2 Demounting 44

11.3 Preparing the components for storage or further use 44

12 Disposal 44

12.1 Environmental protection 44

13 Extension and conversion 44

14 Troubleshooting 45

14.1 How to proceed for troubleshooting 45

14.2 Erroneous states und error diagnostics 45

15 Technical data 46

16 Annex 47

16.1 Addresses 47

17 Alphabetical index 48

About this documentation 5/52

RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG

1 About this documentation

1.1 Validity of the documentation

This documentation is valid for the following analog ampliﬁer module:

• VT-MRMA1-1-1X/V0/0

This documentation is intended for ﬁtters, operators, service technicians and plant

operators.

This documentation contains important information on the safe and appropriate

installation, transport, commissioning, maintenance, operation, removal and simple

troubleshooting of the product.

▶ Read this documentation thoroughly, especially chapter 2 “Safety instructions“

and chapter 3 “General notes on damage to material and the product“, before

working with the analog ampliﬁer module.

1.2 Required and supplementary documentation

▶ Only commission the product, when you have the documents marked with the

book symbol at hand and have understood and observed them.

Table 1: Required and supplementary documentation

1.3 Representation of information

In order that this documentation allows you to work directly and safely with your

product, standardized safety notes, symbols, terms and abbreviations are used. For a

better understanding, these are explained in the following sections.

1.3.1 Safety instructions

This documentation contains safety notes in Chapter 2.6 “Product-speciﬁc safety

instructions“ and Chapter 3 “General notes on damage to material and the product“

as well as before a sequence of activities or instructions for action, which involve the

risk of personal injury or damage to equipment. The measures described for averting

the hazard have to be observed.

Safety notes are structured as follows:

SIGNAL WORD

Type and source of hazard!

Consequences in the case of non-observance

▶ Measures to avert the hazard

▶ <Enumeration>

Title Document number Type of

document

Analog ampliﬁer module VT-MRMA1-1 30214 Data sheet

Pressure transducer for hydraulic applications, type HM20-2X 30272 Data sheet

Proportional pressure reducing valve with DC motor actuation 29173 Data sheet

Power supply unit type VT-NE30-2X 29929 Data sheet

6/52 About this documentation

Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019

•Warning symbol: draws attention to a hazard

•Signal word: identiﬁes the degree of hazard

•Type and source of hazard: identiﬁes the type or source of the hazard

•Consequences: describes the consequences in the case of non-observance

•Precautions states, how the hazard can be avoided

Table 2: Hazard classes according to ANSI Z535.6-2011

Warning sign, signal word Meaning

DANGER Indicates a hazardous situation which, if not avoided, will

certainly result in death or serious injury.

WARNING Indicates a hazardous situation which, if not avoided, could

result in death or serious injury.

CAUTION Indicates a hazardous situation which, if not avoided, could

result in minor or moderate injury.

NOTICE Damage to property: The product or the environment can be

damaged.

1.3.2 Symbols

The following symbols refer to notes, which are not relevant to safety, but increase

the legibility of the documentation.

Table 3: Meaning of symbols

Symbol Meaning

If this information is disregarded, the product cannot be used or operated

in an optimum manner.

▶ Individual, independent action

Numbered instructions for action:

The numbers indicate that the activities are to be carried out consecutively.

1.3.3 Terms used

The following terms are used in this documentation:

Table 4: Terms used

Term Meaning

VT-MRMA1 Analog ampliﬁer module

UB Operating voltage

HM20 Pressure transducer

1.3.4 Abbreviations used

The following abbreviations are used in this documentation:

Table 5: Abbreviations used

Abbreviation Meaning

EMC ElectroMagnetic Compatibility

PE Protective Earth

PELV Protective Extra Low Voltage

Safety instructions 7/52

RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG

2 Safety instructions

2.1 About this chapter

The analog ampliﬁer module has been manufactured according to good engineering

practice. There is, however, still a risk of personal injury or damage to equipment

if you do not observe this chapter and the safety instructions contained in this

documentation.

▶ Read these instructions completely and thoroughly before working with the

product.

▶ Keep this documentation in a location where it is accessible to all users at all

times.

▶ Always pass the product together with the required documentation to third

parties.

2.2 Intended use

The analog ampliﬁer module is an electrical component.

You may use the product as follows:

• For controlling a DC motor-actuated proportional pressure reducing valve with

electrical position feedback, type (Z)DRS, size 6, component series 1X

The product is intended exclusively for professional use and not for private usage.

Operation according to the intended use also implies that you have read

and understood this documentation completely, especially chapter 2 “Safety

instructions“.

2.3 Improper use

Any use other than described in the section “Intended use” is considered as

improper and is therefore not permitted.

For damage resulting from improper use, Bosch Rexroth AG will not bear liability.

The risks arising from improper use lie exclusively with the user.

Improper use includes, but is not limited to the following, foreseeable misuse:

• operating the analog ampliﬁer module outside the speciﬁed performance limits and

operating conditions, especially the prescribed ambient conditions;

2.4 Personnel qualiﬁcations

The activities described in this documentation require basic knowledge of electrics

and hydraulics as well as knowledge of the associated technical terms. To ensure

safe usage, these activities may therefore only be carried out by qualiﬁed personnel

or under the direction and supervision of qualiﬁed personnel.

Qualiﬁed personnel are those who can recognize possible hazards and institute

the appropriate safety measures due to their professional training, knowledge and

experience, as well as their understanding of the relevant conditions pertaining to

the work to be done. Qualiﬁed personnel have to observe relevant specialist rules

and have the required expertise.

With regard to hydraulic products, specialist knowledge means, for example:

• The ability to read and entirely understand hydraulic circuit diagrams,

8/52 Safety instructions

Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019

• the complete understanding in particular of interrelationships with regard to safety

equipment and

• knowledge of the function and structure of hydraulic components.

Bosch Rexroth oﬀers qualifying training courses in speciﬁc ﬁelds. You can ﬁnd an

overview of training contents on the Internet at:

http://www.boschrexroth.com

2.5 General safety instructions

• Observe valid regulations for accident prevention and environmental protection.

• Observe the safety regulations and rules of the country where the product is used/

operated.

• Use Rexroth products only in technically perfect condition.

• Observe all notes given on the product.

• Persons who install, commission, operate, demount or maintain Rexroth products

must not consume any alcohol, drugs or pharmaceuticals that may aﬀect their

ability to respond.

• Only use accessory and spare parts approved by the manufacturer in order to rule

out personnel hazards arising from unsuitable spare parts.

• Adhere to the technical data and ambient conditions speciﬁed in the product

documentation.

• If unsuitable products are installed or used in safety-relevant applications,

unintended operational states may occur in the application that can cause personal

injury and/or damage to property. Therefore, use the product only in safety-relevant

applications such as in explosion protection areas or in safety-related parts of a

control (functional safety), if this use is expressly speciﬁed and permitted in the

documentation.

• You may commission the product only when it has been established that the ﬁnal

product (for example, a machine or system), in which the Rexroth products is

installed, complies with national regulations, safety regulations and standards

relevant for the application.

• Observe safety-relevant information and information on risks in the operating

instructions of the manufacturer of the connected hydraulic system before

commissioning the analog ampliﬁer module with a hydraulic system.

• Technical data, the connection and installation conditions can be found in the

product documentation and have to be strictly observed.

• Observe general installation and safety regulations for working on electrical

systems.

• Generally, you may not modify or convert the product.

2.6 Product-speciﬁc safety instructions

If for certain work to be carried out safety features on the product are temporarily

not used for functional reasons, you have to ensure the same safety and protection

level in a diﬀerent way in accordance with valid regulations.

Safety instructions 9/52

RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG

WARNING

Hazardous movements!

Risk of injury due to incorrect activation of the proportional pressure reducing valve

via the analog ampliﬁer module and resulting unforeseeable machine movements.

▶ Operate the ampliﬁer only together with the valves speciﬁed in the type code.

▶ Observe safety in accordance with EN 13849 or IEC 62061.

▶ If persons have to enter the hazard zone while the control is active, provide

superordinate monitoring functions or measurers for personal safety. The plant

manufacturer/user has to rate and dimension these measures on the basis of

a risk and failure analysis according to the speciﬁc situation on site. The safety

regulations valid for the system have to be taken into account for this.

▶ The electronics emits interference to other electronics within the permitted limit

values. This can cause malfunction in the control process. Only use electronics

below the EMC limit values or provide appropriate shielding.

▶ The electronics of the analog ampliﬁer module VT-MRMA1 responds to

electromagnetic interference from non-shielded, improperly installed or wrongly

connected signal cables. If the limit values given in the data sheet are exceeded,

malfunction or uncontrolled movements are possible. Adhere to the limit values

given in the data sheet, use only electronics below the EMC limit values or

provide proper shielding.

▶ Electrostatic processes, an inadequate grounding concept or missing

equipotential bonding can lead to damage to the electronics and hence

cause malfunction or uncontrolled movements of the machine. Ensure proper

grounding and provide equipotential bonding.

▶ Using the product outside the speciﬁed IP protection class can result in

short-circuit and malfunction and hence in uncontrolled machine movements.

Therefore, use the product only within the IP protection class and in

environments as speciﬁed in the data sheet.

▶ Provide safety functions for personal safety separately. The analog ampliﬁer

module VT-MRMA1 itself does not include safety functions for personal safety

and is no safety-related component.

High electric voltage through incorrect connection!

Danger to life, risk of injury due to electric shock.

▶ When carrying out any work, disconnect the relevant machine section from the

power supply and protect it against being switched on again.

▶ Only connect devices, electrical components and lines which feature protective

extra low voltage (PELV) to connections or terminals having voltages from 0 to

50 Volt.

▶ Only connect voltages and power circuits that feature safe isolation from

dangerous voltages. Safe electrical isolation can be achieved with, for example,

isolating transformers, safe opto-couplers or mains-free battery operation.

10/52 General notes on damage to material and the product

Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019

WARNING

Lightning!

Risk of uncontrolled machine movements.

▶ An inadequate grounding concept or missing equipotential bonding can lead to

damage to the electronics. Provide for equipotential bonding of the device.

Failures and defects in the control current circuits or the energy supply!

Risk of uncontrolled machine movements.

▶ Observe safety in accordance with EN 13849 or IEC 62061.

CAUTION

Hot surfaces!

Risk of burning.

▶ System parts can heat up during operation. Let system parts cool down before

touching it or wear protective gloves.

3 General notes on damage to material and

the product

The warranty is valid exclusively for the conﬁguration delivered.

• Warranty claims will be rejected in the case of improper installation,

commissioning and operation as well as in the case of use not in accordance with

the intended purpose and/or improper handling.

NOTICE

High voltage!

Risk of damage to the analog ampliﬁer module.

▶ Wire the analog ampliﬁer module only when disconnected from the power

supply.

Overloading!

Risk of overloading and damage to the supply cable in the case of insuﬃcient

dimensioning and/or operation with several electrical devices.

▶ Provide current limitation by overload protection.

▶ Select an appropriate rating of power supply unit and cables.

Short-circuit!

Risk of overloading and damage of the supply cable in the case of defects of the

electrical device.

▶ Provide current limitation by overload protection.

Impermissible temperature range!

Risk of overheating. The device can be thermally destroyed.

▶ Adhere to the speciﬁcation in the data sheet.

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