Related Manuals for Bosch Rexroth VT-MRMA1-1
Summary of Contents for Bosch Rexroth VT-MRMA1-1
- Page 1 VT-MRMA1-1 Analog amplifier module Operating instructions Replaces: 03.2017 RE 30214-B/03.2019 English...
- Page 2 © This document, as well as the data, 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.
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Page 3: Table Of Contents
7.6.1 Terminal assignment 7.6.2 Connection of the power supply unit 7.6.3 Connection of the pressure reducing valve 7.6.4 Connection of actual pressure value cables (pressure transducer) 7.6.5 Connection of the control 7.6.6 Plug-in screw connectors Commissioning RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... - Page 4 Preparing the components for storage or further use Disposal 12.1 Environmental protection Extension and conversion Troubleshooting 14.1 How to proceed for troubleshooting 14.2 Erroneous states und error diagnostics Technical data Annex 16.1 Addresses Alphabetical index Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019...
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Page 5: About This Documentation
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> RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... -
Page 6: Symbols
Analog amplifier module Operating voltage HM20 Pressure transducer 1.3.4 Abbreviations used The following abbreviations are used in this documentation: Table 5: Abbreviations used Abbreviation Meaning ElectroMagnetic Compatibility Protective Earth PELV Protective Extra Low Voltage Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 7: Safety Instructions
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. -
Page 8: General Safety Instructions
• 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... - Page 9 (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. RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG...
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Page 10: General Notes On Damage To Material And The Product
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. Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 11: Scope Of Delivery
• Analog amplifier module Accessories such as cables and mains adaptor and cable sets are not included in the scope of delivery, but have to be ordered separately. See also chapter 7.3 “Recommended accessories“on page 26. RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... -
Page 12: About This Product
• Two 24 V outputs for pressure switches • Test jack can be switched over • Reverse polarity protection for power supply (short-circuit-proof power supply unit) • Power supply unit with DC/DC converter • LED indicator lamps Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 13: Block Circuit Diagram Of The Controller Structure Of The Analog Amplifier Module
(and optional pressure transducer). The valve is self-locking. • HM20-2X: Pressure transducer at ZDRS 6VP-1X • VT-NE30-2X: Power supply unit • Machine control: command value provision, I/O for control and status of the amplifier module RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... -
Page 14: Function
8 Fault detection 9 "Position command value reached" recognition 10 Output stage 11 Enable function 12 Actual valve position value acquisition 13 Actual pressure value preparation 14 Pressure switch function 15 Measuring point changeover switch Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 15: Functions Within The Amplifier Module
The ramp time refers to a signal change of 100 %. The ramp time is not extended or reduced by the downstream ”pressure command value attenuator”. RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... -
Page 16: Controller And Functions Closely Related To The Controller
Table 12: Valve position controller Purpose Effect Setting Generation of output variable Matching of the actual None for clocked output stage valve position value with from the system deviation of the internally applied valve position. position command value. Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 17: Actual Value Preparation
The position transducer integrated in the valve is supplied from a voltage output (terminals 3 and 4). A cable break of a position transducer port is detected (ready output) and the output stage is switched off. RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... - Page 18 Pressure switch signal A Pressure switch signal B (terminal 13) (terminal 14) No switching threshold exceeded 24 V (HIGH) 24 V (HIGH) Value fallen below lower switching 0 V (LOW) 24 V (HIGH) threshold (insufficient pressure) Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019...
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Page 19: Monitoring Functions
LOW. 5.2.6 Monitoring functions The monitoring functions of the amplifier module are to detect faults in the system and in the supply lines and to initiate appropriate measures in the event of a fault. RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... - Page 20 • Jamming of the valve actuator • Positive feedback as a result of exchanged motor cables • Motor cable break The protective motor circuit detects these faults only when a new pressure adjustment process is being initiated. Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019...
- Page 21 Preconditions for the internal controller and output stage enable: • The ”external enable” is set (see also “Enable function “external enable“ (11)“ on page 17 RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG...
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Page 22: Identification Of The Product
At the side of the VT-MRMA1 there is a label showing the most important data. 1 Word mark 5 Serial number 2 Material short text 6 Date of production 3 Operating voltage 7 Plant 4 Material number 8 Country of origin Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 23: Transport And Storage
Proceed as follows in order to prepare the analog amplifier module for storage and further use: ▶ Only use the original packaging for storage. ▶ Observe the permissible storage temperature range (see data sheet 30214) ▶ Protect the VT-MRMA1 from dust and humidity. RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... -
Page 24: Installation
VT-MRMA1 in order to fulfill EMC requirements. Overheating! The device might be destroyed. ▶ Ensure sufficient air circulation by providing space to the right, to the left, top and bottom. See Fig. 6. Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 25: Installation Conditions
(input resistance, power consumption). Min. 50 mm clearance Min. 25 mm clearance Min. 25 mm clearance Min. 50 mm clearance Fig. 6: Required clearance 7.2 Required tools For installing the product, no special tools are required. RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... -
Page 26: Recommended Accessories
7.3 Recommended accessories We recommend the use of the following accessories for connecting the amplifier module VT-MRMA1. These accessories are not included in the scope of delivery, but can be ordered separately from Bosch Rexroth: Table 25: Accessories Component Material number... -
Page 27: System-Specific Circuitry Of The Amplifier Module
The analog amplifier module VT-MRMA1 is equipped with 8 inputs and 8 outputs to 16 terminals as well as 1 test jack. RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... -
Page 28: Terminal Assignment
24 V output Pressure switch signal (monitors values for exceeding Control the pressure command value window) Output - motor Motor in the valve Output + motor Motor in the valve Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 29: Connection Of The Power Supply Unit
Fig. 9: Terminal connections of the amplifier module (viewed to the front) Table 27: Terminal assignment to the pressure reducing valve Terminal Assignment Explanation - sensor Position transducer ground 1 2 3 4 + sensor Position transducer supply RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... -
Page 30: Connection Of Actual Pressure Value Cables (Pressure Transducer)
The supply of the pressure transducer is ensured by an external power supply unit (see figure below), whose ground has the same potential as terminal 11 of the amplifier module. Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 31: Connection Of The Control
(see figure below). You can replace the amplifier module without having to re-connect the cables to new plugs, for example in the case of servicing. Each of the 4 plug-in screw connectors comprises 4 terminal connections. RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... - Page 32 32/52 Installation Lever plug-in screw connector out by means of a screw driver Mating connector in housing module Plug-in screw connector (4 terminals) Terminal Connection cables Fig. 11: Plug-in screw connectors Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019...
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Page 33: Commissioning
To gain access to the DIL switches, pull module housing 1 (= front) from module housing 2. Procedure: Press the two fixing clamps slightly into the module housing using a screwdriver (blade width approx. 2.5 mm). Loosen module housing 1 (front) from module housing 2 (see figure below). RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... - Page 34 DIL switches (factory setting) S1: Configuration of analog inputs For setting the DIL switches S2: Configuration of pressure switch thresholds Pull housing module 1 with printed-circuit board from housing module 2 Fig. 13: Setting the DIL switches Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019...
- Page 35 They are defined in % and refer to the nominal value (= maximum pressure) of the selected pressure level. The setting always refers to both (upper and lower) absolute switching thresholds. S2.10 has no function! RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG...
- Page 36 • Upper relative threshold: 50 bar * 120 % / 100 % = 60 bar • Lower absolute threshold: 50 bar −3% * 100 bar / 100 % = 47 bar • Upper absolute threshold: 50 bar +3% * 100 bar / 100 % = 53 bar Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019...
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Page 37: Potentiometers
< and t > Pressure command Ramp times (up and down) 0.1 to 100 sec value * With correctly set zero point Use a screwdriver with a blade width of approx. 2.5 mm for adjusting the potentiometer. RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... -
Page 38: Measuring Signal And Measuring Point Selector Switch
A total of 3 LEDs on the front panel of the amplifier module provide information about the states of the amplifier module: • Readiness for operation (green) • Cable breaks of the pressure transducer cables (red) • Enable for position controller and output stage (yellow) Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 39: Commissioning Instructions
When the electronics leaves the factory, it is characterized by the following features: • Minimum ramp times • Sensitivity of GW is set to 100 % • The linearity of the complete system (module electronics and valves) is subject to series production tolerances RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... -
Page 40: Fine Tuning Of The Complete System
(position 4 for ramp Up t< and position 5 for ramp Down t>) t< Adjust the ramp times according to the formula or the table “ramp time setting” (see t> “Ramp generator (3)“ on page 15) at test jack v. Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 41: Application Example
Notes on the sequence The following explanations with regard to signals apply to the sequence program. program They are used for synchronizing the amplifier module with the higher-level control: • Enable input (24 V input): RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... - Page 42 Positioning signal ”position command value reached” is re-activated High Pressure switch signal A (pressure is present within the agreed tolerance High range) Pressure switch signal B (pressure is present within the agreed tolerance High range) Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019...
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Page 43: Operation
The VT-MRMA1-1 amplifier module can only be replaced as a complete unit. Unauthorized modifications on the amplifier module are not permitted for safety reasons! Repair work may only be carried out by Bosch Rexroth AG. For repair purposes send the device to the service address given in chapter 16. -
Page 44: Demounting And Replacement
13 Extension and conversion The analog amplifier module VT-MRMA1-1 may be neither extended nor converted. If you convert the amplifier module, the warranty becomes void. Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 45: Troubleshooting
"Position command value reached“ become inactive (0 V) Cable break or short-circuit The green “ready” LED is OFF Replace cable (at 4...20 mA input) Check pressure command Pressure switch signals A or B becomes value connections inactive RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... -
Page 46: Technical Data
PTC thermistor fuse limited to current Eliminate short-circuit "re-adjusted"! motor cables consumption Enable cable Cable break Output stage is switched off Replace cable 15 Technical data The technical data can be found in data sheet 30214. Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... -
Page 47: Annex
Bosch Rexroth AG Zum Eisengießer 1 97816 Lohr am Main Germany Phone +49 (0) 9352/40 30 20 E-mail my.support@boschrexroth.de The addresses of our sales and service network and sales organizations can be found at www.boschrexroth.com/addresses RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG... -
Page 48: Alphabetical Index
Electronic limit stop Pinout: Pressure transducer − Enable function amplifier module − power supply unit Environmental protection Erroneous states und error Plug-in screw connectors diagnostics Position controller and output stage Extension and conversion enable Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019... - Page 49 ▶ T Technical data Terminal assignment Terminal assignment of actual pressure value input Terminal assignment to the pressure reducing valve Terms Transporting Troubleshooting ▶ U – improper – intended ▶ V Valve position controller RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG...
- Page 50 50/52 Alphabetical index Bosch Rexroth AG, VT-MRMA1-1, RE 30214-B/03.2019...
- Page 51 Alphabetical index 51/52 RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG...
- Page 52 Bosch Rexroth AG Industrial Hydraulics Zum Eisengießer 97816 Lohr a. Main Germany Phone +49 (0) 9352/40 30 20 my.support@boschrexroth.de www.boschrexroth.com Subject to revision Printed in Germany RE 30214-B/03.2019...