RE 30011-B, Edition 10.2021, Bosch Rexroth AG
Commissioning |
Pressure and flow control system SYDFE1 series 2X, 3X
63/96
Control electronics VT 5041-3X includes a monitoring function that evaluates the
control error. Usually, the system reduces the control deviation to almost zero
within a few 100 msec. In the event of a fault, the correction takes, however,
longer in most of the cases.
The monitoring feature continuously checks the valve command value (= control
deviation x controller gain; test jack 5) and signals an error as soon as the amount
exceeds the value of 4 V for longer than 1 second.
To be still compatible with control electronics of series 2X in terms of function,
this monitoring feature can be deactivated by means of a jumper (J9).
Table 13: Activation/deactivation of valve command value monitoring
Valve command value monitoring
Jumper J9
ON
ON
OFF
OFF
Factory setting: Valve command value monitoring deactivated, J9: OFF
Depending on the command and actual values, the monitoring feature may cut
in while the drive motor is switched off. This can take place, if the command
values for pressure and/or swivel angle are not matched to the current actual
values for pressure and swivel angle and the consequence is a valve command
value of > 4 V (amount!). The valve command value can be measured at test
jack 5 of the control electronics.
The safety concept of control electronics V T5041-3X is designed so that the
detection of a fault is signaled by the fault signal outputs and, at the same time,
the activation of the pilot valve is interrupted. This ensures that the pilot valve
takes a defined position and the pump with
internal pilot supply
swivels to the
zero stroke position.
With control electronics VT 5041-3X, the shutdown of the valve output stage can
be prevented by means of a jumper. To this end, jumper J1 must be set.
Table 14: Activation/deactivation of valve shutdown
Valve shutdown in the event of a fault
Jumper J1
Active
OFF
Inactive
ON
Factory setting: Valve shutdown active; J1 not set
Attention:
When the fault-triggered shutdown of the valve output stage is deactivated, the
higher-level control must take appropriate measures (disabling of VT 5041-3X,
pump motor OFF...) in the case of faults to ensure safety for man and machine.
This function is available only on the variant without power limitation (VT 5041-
3X/1... and VT 5041-3X/2...)!
Pressure controller OFF
On the VT 5041-3X variant “without power limitation”, connection 18a is provided
as switching input.
By ap24 V to this input, the pressure controller of the control electronics
can be switched off. In this way, the function of the DFE control is reduced to that
of an FE control. To this end, it is not required to connect the pressure command
value and the actual pressure value to the control electronics.
This function can also be used by the higher-level control to deliberately deactivate
the pressure controller of the VT 5041-3X for certain time intervals within a
machine cycle.
Monitoring of valve
command value (J9)
Valve shutdown in the
event of a fault (J1)
Function of pressure
controller OFF or master/
slave (J4)
