Bit
Value
Description
15 ... 8
–
Error code (equals to [E9.05])
7
1
Error
0
No error
6
1
Stall over current
0
Normal
5
1
Stall over voltage
0
Normal
4
1
Decelerating
0
Not in deceleration
3
1
Accelerating
0
Not in acceleration
2
1
Jogging
0
Not in jog
1
1
Running
0
Stop
0
1
Reverse
0
Forward
Tab. 14-8:
Bit definition of H0.01 (status word)
Information about standard firmware status word also can be found in Multi-
Ethernet Card Instruction Manual (R912006860).
14.5.4
General DRn system troubleshooting
Problem
Reason
Solution
Boost function repeatedly
activated
Possible reasons can be:
1. Cyclic load change which trigger
boost
2. Too fast speed adaptation which is
disturbing pressure control
3. Bad tuning of velocity control
1. Set pressure window to higher value
2. Lower Ramp pitch , boost ramp
3. Configure boost wait time F3.25 with a
value bigger then slowest hydraulic sys‐
tem time constant
4. Tune the velocity control to be more dis‐
turbance rejective
General pressure oscillation
1. Hydraulic dead volume may be to big
and lead to oscillation in the pressure
control loop
2. Bulk Modulus changing due heat or
air enclosure in the hydraulic oil can
alter the pressure control loop and
lead to oscillation
3. Velocity loop prone to disturbances
on rising motor winding resistance
temperature can lead to oscillations
in speed and therefore in pressure
1. Use damping nozzles to damp pressure
oscillations in the mechanical controller
2. Tune the velocity control to be more dis‐
turbance rejective
Tab. 14-9:
DRn system troubleshooting
DOK-SYTROX-DRN5020****-IT05-EN-P
Bosch Rexroth AG
139/143
Frequency-Controlled Pump Drive System Sytronix DRn 5020
Troubleshooting
