BOSCH REXROTH
R901094751
$1,271.09 USD
- BOSCH REXROTH
- Material:R901094751
- Model:VT-MRPA1-2-1X/V0/0
Quantity in stock: 0
The Bosch Rexroth VT-MRPA1-2-1X/V0/0 (R901094751) is a sophisticated amplifier module designed for seamless integration with proportional valves, particularly the way proportional directional valves WRE with one solenoid. This component is engineered to be easily mounted onto top hat rails in accordance with EN standards, utilizing screw terminals for a secure electrical connection. It operates on V direct voltage and includes a power supply unit with a making current limiter to provide all necessary internal supply voltages. The module features command value presetting capabilities, where the internal command value signal is derived from an external command value signal at the differential input and adjusted by the zero point offset potentiometer. The enable function activates the current output stages and conveys the internal command value to the ramp generator, preventing abrupt valve openings through controlled adjustments by set ramp times. The ramp generator plays a crucial role in moderating the incline of the control output without altering ramp time. The characteristic curve generator allows for fine-tuning of step levels and maximum values according to hydraulic needs, ensuring linear progression through zero points. An amplitude limiter ensures that the internal command value does not exceed approximately 100% of its nominal range. Additionally, an oscillator generates control signals for inductive position transducers, while a demodulator processes actual value signals from these transducers. A dedicated controller optimizes control spool position in relation to specific valve requirements. The current output stage generates pulsed solenoid currents within defined limits and incorporates short-circuit protection; it also deactivates in response to internal fault signals or if an enable signal is absent. Fault recognition systems are included to monitor potential issues such as cable breaks or short circuits in position transducer cables and overcurrents at the output stage. The module's design includes differential input for voltage ramp generation with adjustable ramp times, sensitivity adjustments, step level settings, cable break detection for actual value cables, reverse polarity protection for operating voltage, and LED indicators for operational readiness and enable status. It belongs to component series X and showcases an analog modular design tailored for specific applications within hydraulic systems.
General information
The amplifier modules are snapped onto top hat rails according to EN 60715. The electrical connection is established via screw terminals. The modules are operated with 24 V direct voltage.
Power supply unit [1]
The amplifier modules have a power supply unit with making current limiter. This unit supplies all internally required positive and negative supply voltages.
Command value presetting
The internal command value signal is calculated from the total [3] of the external command value signal available at the differential input [2] and the zero point offset (zero point potentiometer "Zw"). A positive command value results in a current increase in the solenoid.
Enable function [11]
The enable function enables the current output stages and forwards the internal command value signal to the ramp generator. The enable signal is indicated by an LED on the front plate. If enable is connected, the internal command value is changed (with any kind of command value presetting) by the set ramp time. Thus, a controlled valve does not open abruptly.
Ramp generator [4]
The ramp generator limits the incline of the control output. The downstream step functions and amplitude attenuators do not extend or shorten the ramp time.
Information on ramp time setting and measurement:
|
Value at measuring socket |
U/V |
5 |
3 |
2 |
1 |
0.5 |
0.3 |
0.2 |
0.1 |
0.05 |
0.03 |
0.02 |
|
Current ramp time (±20 %) |
t/ms |
20 |
33 |
50 |
100 |
200 |
333 |
500 |
1000 |
2000 |
3333 |
5000 |
Formula for calculation of the ramp times:
t in ms, U in volt at the measuring socket
Characteristic curve generator [5]
Using the adjustable characteristic curve generator, step level and maximum values can be adjusted to the hydraulic requirements. The actual development of the characteristic curve through the zero point is not stepped but linear.
Amplitude limiter [6]
The internal command value is limited to approx. +110 % of the nominal range.
Oscillator [9]
The oscillator creates the control signal for the inductive position transducer.
Demodulator [10]
The demodulator supplies the actual value signal of the control spool position from the position transducer signal.
+100 % ≙ +10 V
Controller for the control spool position [7]
The position controller is optimized in a valve-specific manner.
Current output stage [8]
The current output stage creates the clocked solenoid current for the proportional valve. The solenoid current is limited to 2.4 A to 2.6 A. The output stage output is short-circuit-proof. The output stage is de-energized in case of an internal fault signal or if the enable signal is missing.
Fault recognition [14]
The position transducer cable is monitored for cable break and short-circuits on the primary side as well as for over-currents at the output stage.
[ ] = Assignment to the block diagram
|
01 |
Valve amplifier for proportional directional valves with electrical position feedback, analog, euro-card format |
VT-MRPA |
|
02 |
For valves: 4WRE (with one solenoid) |
1 |
|
03 |
For valves: 4WRE 6...2X |
1 |
|
For valves: 4WRE 10...2X |
2 |
|
|
04 |
Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) |
1X |
|
05 |
Version: standard |
V0 |
|
06 |
Further details in the plain text |
* |
|
01 |
02 |
03 |
04 |
05 |
06 |
||||
|
VT-MRPA |
1 |
‒ |
‒ |
1X |
/ |
V0 |
/ |
* |
General
|
Component series |
1X | |
|
Type of electronics |
Analog | |
|
Design |
Modul |
Voltage supply
|
Operating voltage |
nominal |
U |
V |
24 |
|
Lower limit value |
UB(t)min |
V |
18 | |
|
Upper limit value |
UB(t)max |
V |
35 | |
|
Power consumption |
max. |
PS max |
VA |
24 |
|
Current consumption |
max. |
I |
A |
2 |
|
Fuse |
Thermal overload protection (with restart if the value falls below the temperature threshold) | |||
Analog inputs
|
Command value |
Voltage (differential input) |
U |
% |
0 ... 10 | |
|
Voltage (differential input) |
Input resistance |
R |
kΩ |
≥ 50 | |
Digital inputs
|
Enable |
On (active) 1) |
U |
V |
8.5 ... UB |
|
Off (inactive) |
U |
V |
0 ... 6.5 |
| 1) | RE > 100 kΩ |
Solenoid outputs
|
Solenoid current |
max. |
Imax |
A A |
2.5 |
|
Clock frequency (freely clocking) |
f |
Hz |
5 kHz | |
|
Solenoid output |
other properties |
Short-circuit-proof, clocked | ||
Position transducer
|
Oscillator voltage |
U |
V |
10 (I = 10 mA) |
|
Oscillator frequency |
U |
V |
5.6 |
Adjustment options
|
Zero point calibration |
% |
± 30 | |
|
Amplitude attenuator 1) |
for command value |
% |
0 ... 110 |
|
Zero point |
actual valve position value |
% |
±10 |
|
Ramp time up/down |
s |
0.02 … 5 | |
|
Step-change height |
% |
0 ... 50 | |
| 1) | Applies to a step level setting of 0% |
Measuring sockets
|
Command value |
"w" |
V |
0 ... 10 | |
|
after ramp |
"wR" |
V |
0 ... 10 | |
|
Ramp time |
“down" |
s |
0.02 ... 5 | |
|
“up" |
s |
0.02 ... 5 | ||
|
Actual value |
"x" |
V |
0 ... 10 | |
Displays
|
LED display |
green |
Ready for operation | |
|
yellow |
Enable |
Supplementary information
|
Anschlussart |
12 screw terminals | ||
|
Mounting type |
Top hat rail TH 35-7.5 according to EN 60715 | ||
|
Type of protection according to EN 60529 |
IP 20 | ||
|
Ambient temperature range |
ϑ |
°C |
0 … 50 |
|
Storage temperature range |
ϑ |
°C |
-25 … 70 |
|
Weight |
m |
kg |
0.14 |
For applications outside these parameters, please consult us!
Notice:
For information on environment simulation testing for the fields EMC (electro-magnetic compatibility), climate and mechanical load, see data sheet 30219-U
LED displays
|
|
Ready for operation (green) |
|
|
Enable (yellow) |
|
Gw |
Amplitude attenuator |
|
Sw |
Step-change height |
|
Zw |
Zero point command value |
|
Zx |
Zero point actual value |
|
t <
|
Ramp time "Ramp up" |
|
t >
|
Ramp time "Ramp down" |
Measuring sockets
|
t <
|
Ramp time "Ramp up" |
|
t >
|
Ramp time "Ramp down" |
|
x |
Actual value |
|
w |
Command value |
|
wR |
Command value after ramp |
|
⊥ |
Reference potential |
|
Zw |
Zero point command value |
|
Zx |
Zero point actual value |
|
t <
|
Ramp time "Ramp up" |
|
t >
|
Ramp time "Ramp down" |
|
Sw |
Step-change height |
|
Gw |
Amplitude attenuator |
|
Gx |
Sensitivity actual value |
|
w |
Command value |
|
x |
Actual value |
|
wR |
Command value after ramp |
|
|
Ready for operation (green) |
|
|
Enable |
|
1 |
Power supply unit |
|
2 |
Differential amplifier |
|
3 |
Command value summation |
|
4 |
Ramp generator |
|
5 |
Characteristic curve generator |
|
6 |
Amplitude limiter |
|
7 |
Valve position controller |
|
8 |
Power output stage |
|
9 |
Oscillator |
|
10 |
Demodulator |
|
11 |
Enable |
|
12 |
Proportional valve |
|
13 |
Position transducer |
|
14 |
Fault recognition |
Mounting cavity R/T-31A; 4 main ports; thread M20 x 1.5 mm
Dimensions in mm
Dimensions in mm
The amplifier module may only be wired when de-energized.
Do not lay lines close to power cables.
Do not use free-wheeling diodes in the solenoid conductors.
The distance to aerial lines, radios, and radar systems has to be at least 1 m.
Always shield command value and position transducer lines; connect shielding to protective earthing (PE) on the module side.
In some cases (e.g. if PE is subject to strong interference) it can be necessary to connect the shield of the position transducer line directly to the L0 of the amplifier module; other side open (risk of ground loops).
Recommendation:
Also shield the solenoid conductors. For solenoid conductors up to a length of 50 m, use cable type LiYCY 1.5 mm2. For greater lengths, please contact us.
For switching command values, relays with gold-plated contacts have to be used (low voltages, low currents)!
Only carry out measurements at the module using instruments with Ri > 100 kΩ.
For setting the potentiometers, use a screwdriver with a blade width of 4 mm.
With a strongly fluctuating operating voltage, it may in individual cases be necessary to use an external smoothing capacitor with a capacity of at least 2200 µF.
Recommendation: Capacitor module VT 11110 (see data sheet 30750); sufficient for up to 3 amplifier modules
Setting information
Requirements: The system-specific circuitry must have been completed.
Zero point command value
Set the external command value presetting to zero
Set the internal command value to zero using the "Zw” zero point potentiometer and carry out a check at the "wR" measuring socket
Zero point actual value
Enable signal "OFF" or pull solenoid plug (valve moves to end position)
with potentiometer "Zx", set the actual value at measuring socket "x" to zero.
Recommendation:
At valves with V spool, set the zero point in operation with the hydraulic drive, i.e.
apply enable signal, check at measuring sockets "wR" and "w"
use the "Zx" potentiometer to bring the drive to a standstill
Ramp times
Set ramp time according to formula or table (see functional description "Ramp generator”) and check it at the "t >" and "t <" measuring sockets
Step level
Apply enable signal
Using the "Zw" zero point potentiometer, set the measurement signal at "wR" to –0,3 V
Using the "Sw" potentiometer, set the required step level
Check the required step level, set the zero point
Notice:
With external command value presetting, it must at least result in –0.3 V at the "wR" measuring socket.
Maximum values
Notice:
Before adjusting the maximum values, zero point and step levels must be set correctly.
The maximum current must not exceed the rated solenoid current!
Externally generate a command value of +100 %
Using the "Gw" potentiometer, set the required maximum control output and carry out a check at the "wR" and "w" measuring sockets