Externally Setting The Ramp Time; Setting The Step Level - Bosch Rexroth VT-VSPA2-1-2X Series Manual

30/40 Commissioning
Conversion table
J3 U /V
test socket
Open (= basic t/msec ±20 %
setting)
Plugged t/sec ±20 %
option VT-.../T1
option VT-.../T5
option VT-.../T1
Bosch Rexroth AG, VT-VSPA2-1-2X/V0/T., RE 30110-B/11.2012
8.2.4

Externally setting the ramp time

If you use an additional potentiometer, you have the following options:
• Increasing the internally set ramp time
• Remote control of the ramp time
• Changing the ramp time by means of analog step specification of an external control
The table below lists the ramp time corresponding to the measured test voltage.
The conversion formula is:
Table 10: Ramp times and test voltages
5 3 2 1
20 33 50 100
0.2 0.33 0.50 1
Procedure:
1. Turn ramp potentiometer "t" to the left stop.
2. Set the ramp time using the external potentiometer according to the conversion
formula or conversion table. Check the setting of the measuring socket "t".
Procedure:
Prerequisite: No ramp call-up must be operated.
1. Turn potentiometer "t5" to the left stop.
2. Switch measuring point selector switch to "F" (= current ramp time "t").
3. Set the ramp time using the external potentiometer according to the conversion
formula or conversion table. Check the setting of the measuring socket "v".
You can now set the next ramp time (repeat procedure).
8.2.5

Setting the step level

By setting the step level, you can correct the characteristic curve of the command
value signal and adjust it to the hydraulic requirements.
This adjustment option is used to:
• Compensate the hydraulic valve spool overlap
• Set the optimal creep speed for defined input signals
Procedure:
Prerequisite: Enable signal is connected, jumper J4 is open.
1. Read all settings on the measuring socket "w".
2. Turn potentiometers "S+" and "S–" to the left stop.
3. Use potentiometer "Zw" to set the measurement signal to +0.3 V.
4.
Use potentiometer "S+" to set the required step level.
5. Use potentiometer "Zw" to set the measurement signal to –0.3 V.
6. Use potentiometer "S–" to set the required step level.
7.
Use potentiometer "Zw" to set the zero point.
t = 100 msec / U /V
test socket
0,5 0,3 0,2 0,1
200 333 500 1000
2 3.33 5 10
0,05 0,03 0,02
2000 3333 5000
20 33 50