Block Circuit Diagram Of The Controller Structure Of The Analog Amplifier Module; Product Description; Components That Can Be Connected - Bosch Rexroth VT-MRMA1-1 Operating Instructions Manual

Pressure
Pressure command value preparation
command
value
Actual
pressure Actual
value
pressure value
preparation
5.1.1 Block circuit diagram of the controller structure of the analog amplifier
module:
Internal pressure
command value
Pressure switch
function with adjustable
switching thresholds for
pressure command value
Fig. 1: Block circuit diagram of the controller structure of the analog amplifier module
From the external pressure command value, the pressure command value processor
generates both, the internal pressure command value and − according to the
valve characteristics − the internal valve position command value. The PI position
controller acquires the system deviation on the basis of the valve position command
value and the actual valve position value and generates from this the position
control output for the DC motor in the pressure reducing valve. An absolute position
transducer integrated in the valve provides the actual valve position. The integrated
pressure switch function compares the processed actual pressure value with the
processed pressure command value. Pressure values above or below limit values can
be diagnosed via outputs A or B of the pressure switch.

5.2 Product description

5.2.1

Components that can be connected

The following components are to be connected to the analog amplifier module (for
data sheets, see chapter 1.2 "Required and supplementary documentation" on page
5):
• ZDRS 6VP-1X: Proportional pressure reducing valve with electromotive adjustment
element (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
Position control varialbe
Internal
valve
position
PI
command
position
value
+ con
troller
−
Internal actual
A
valve position
command value
B
RE 30214-B/03.2019, VT-MRMA1-1, Bosch Rexroth AG
About this product 13/52
Actual pressure
value
Valve
Output
Motor
stage
Position
transducer
Actual position
value feedback
Actual
position value
preparation