Installation 31/52
RE 30214-B/03.2019, VT-MRMA1-1,
Bosch Rexroth AG
Fig. 10: Pinout: Pressure transducer − amplifier module − power supply unit
7.6.5 Connection of the control
For connecting the amplifier module to the higher-level control, a total of 3 inputs
and 4 outputs are available for the provision of pressure command values, enable
and auxiliary process variables.
Table 30: Terminal assignment to the control
Terminal
Pin
Assignment
Explanation
5 6 7 8
5
-wP
Reference potential of the pressure command
value
6
+wP
Pressure command value
7
Enable
Activation of position controller and output stage
12 11 10 9
9
Position
command value
reached
High, when valve position command value and
actual valve position value are identical
10
Ready for
operation
Monitoring of position transducer and pressure
command value cables (every individual wire),
jamming of the actuator drive and positive
feedback due to incorrect motor wiring, cable
break of a motor cable
16 15 14 13
13
A
Monitoring of actual pressure value for falling
below the threshold
14
B
Monitoring of actual pressure value for exceeding
the threshold
7.6.6 Plug-in screw connectors
The amplifier module offers the possibility of routing the connection cables to a total
of 4 plug-in screw connectors. These can be removed from the module housing with
the help of a screwdriver (blade width approx. 2.5 mm) even when the module is
installed (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.
Power supply
unit
Terminal strip
Pressure transducer
VT-MRMA1
Bridge (in terminal
strip only)
12
11
1
2
+ U
B
0V
0V
− xP
+ xP
+ U
B
Out
1
2
- U
B
+ U
B
