Commissioning 71/104
RE 92076-01-B/10.2017, A4... with HS5E pilot control valve/Series 3x,
Bosch Rexroth AG
Table 18: Errors and their remedy/cause
Fault
Remedy/cause
No voltage supply
available
Check voltage supply at the central plug of the electronics
Field bus does not work
Check wiring
Check IP address
Fault in the pressure
measurement branch
Read out the actual pressure value (p
actual
); it must be 0 bar. The
output signal of the pressure transducer must match the type
of control electronics (current, voltage, nominal value).
Fault in the swivel angle
measurement branch
Comparison of the actual swivel angle value (SW
act
) with the visual
display on the axial piston unit.
Further explanations on the analysis of faults can be found in Chapter 14 “Trouble-
shooting” on page 87.
1.
Close all directional valves upstream of consumers.
2.
Open directional valve to the oil reservoir for depressurized circulation.
3.
Before activating the motor, feed forward low command values (e.g. p = 15 bar,
SW = 10%).
In this state, the HS5E pilot control valve reports an error (excessive control
difference). When the electronics is working properly, the fault message disappears
when the motor is switched on (control difference now equal to zero).
▶
Switch on the drive motor of the pump!
8.1.7 Setting controller parameters
The following description is to simplify setting of the controller parameters.
Depending on the application, you may not need to modify all of the parameters
listed here.
8.1.7.1 Setting controller parameters for cascade structure
Factory setting:
When the HS5E control system is delivered, controller parameters have already
been entered as the default value. This controller setting sets the controller to slow
behavior, which is stable with most systems.
To customize the controller to plant-specific requirements, you need to modify a few
parameters.
8.1.7.2 P-gain (proportional gain)
Table 19: P-gains
Parameters
Designation
P-0-2809
Pressure controller cascade P-gain
P-0-2977
Swivel angle controller P-gain
These parameters are multiplied by the control difference of the respective
controller. This means that they have the effect of a linear gain factor in the
controller. The lower this value is set, the slower is the controller’s response.
However, if you select a value that is too high, the system can become unstable.
When customizing the controller parameters to plant-specific behavior, you generally
only need to modify the P-gain in the pressure controller.
