28/40 Commissioning
Bosch Rexroth AG, VT-VSPA2-1-2X/V0/T., RE 30110-B/11.2012
8 Commissioning
8.1 Safety regulations
Commissioning of the amplifier card requires particular knowledge of electronics
and hydraulic systems. Therefore, amplifier cards may only be commissioned by
experts having knowledge of:
• The function of the card and the hydraulic system
• The properties of the amplifier card
• The function of the superior control system
The warranty expires if you change the setting of the sealed potentiometer ("ramp
time symmetry" and "internal reference voltage).
▶ Prior to installing the card, ensure that the jumpers on the amplifier card are cor-
rectly plugged.
▶ Only use measuring instruments with an internal resistance (R
i
) > 100 kΩ
formeasurements.
▶ Use a screwdriver with a blade width of 4mm for adjusting the potentiometers
and selecting the measuring point selector switch (VT-.../T5).
8.2 Setting the amplifier card
The anolog amplifier card offers the following setting ranges:
Denomination Potentiometer Setting range
Zero adjustment "Zw" ±30 %
Command values "w" to "w4" 0 to 110 %
Ramp times "t1" to "t5" (option T5)
„t" (option T1)
0.02 to 5 sec.; switchable 0.2 to 50 sec
Step level "S+" and "S–" 0 to 50 %
Amplitude attenuator "Gw+" and "Gw–" 0 to 110 % (applies to the step level setting
of 0 %)
Clock frequency "t" J5, J6 ≅ 4WRA6: f = 300 Hz...370 Hz
J5, J6 ≅ 4WRA10: f = 180 Hz...410 Hz
J5, J6 ≅ 4WRZ: f = 170 Hz
J5, J6 ≅ 3DREP: f = 170 Hz
8.2.1 Setting the command value zero point
The command value zero point setting is used to:
• Correct the zero signal at the input
• Set the step function for command value specification if no internal command
value is available
Procedure:
Prerequisite: No command value call-up must be operated.
1. Set external command value specifications to 0 V.
2. Set internal command value to 0V using the potentiometer "Zw". Check the set-
ting of the measuring socket "w".
Procedure:
Prerequisite: No command value call-up must be operated.
1. Set external command value specifications to 0 V.
Setting ranges
Option VT-.../T1
Option VT-.../T5