Bosch rexroth SYDFED 2X Series Manual page 34

34/96 SYDFED-2X, SYDFED-3X, SYHDFED-1X | Product description
U
B
0 V
α (I)
comm
P
p
comm
(I)
Starting point
Bosch Rexroth AG, Edition 11.2021, RE 30017-B
1 U
B
2 L0
4 M0
5 α
comm
10 p
U
11 p
7 p
comm
Fig. 14: Circuitry of SY(H)DFED for master/slave operation (analog) and individual operation
Notes:
– For the configuration of analog command value provision, see the functional
description of HydraulicDrive
– The connection for the position transducer of the pump is not drawn here.
– The coupling element (relay, analog switch) can be optionally installed to
control both pumps independently of one another. With the proposal shown
here, both, swivel angle and pressure control are possible with the slave
pump.
– For the master/slave operating mode, the signal p
maximum (+10 V).
– If closed-loop pressure control is to be realized also in the master/slave
operating mode, only the pressure transducer of the master is evaluated for
controlling purposes. If hydraulically separated operation should be possible,
too, a separate pressure transducer is required for the slave.
– If the signal branch of the pressure transducer of the slave axis is not
provided with a specific circuitry, its pressure controller could intervene
into the swivel angle control in an undesirable manner, when the actual
pressure value p
the command value p
signal instead of the pressure transducer output signal to pin 10 via a second
channel of coupling element "K1" in the master/slave operating mode. Care
must be taken that the P- and D-controller parameter on the slave is not set
higher than on the master.
5.9.1.1 Changing over to master/slave operation (analog)
0 V reference potentials of the PLC/command value source and M0/L0 of the
SYDFED electronics must be connected.
▶ Shortly before the changeover takes place, switch both pumps to pressure
control (low, identical pressure level), while they are hydraulically still
uncoupled from each other. Approximately identical actual swivel angle values
would be optimal. The two flow command values (usually 100 %) still are
provided by the control.
When a pre-load valve is used, the pump with the pre-load valve should
preferably be the master pump.
Master/slave
operation ON
α (II)
comm
α 6
0 V
act
- high
act
P
- low U
act
p (II)
comm
Master
(II) reaches values in the order of ca. 80 % or higher of
act
(II). This can be prevented by connecting a "0 V"
comm
1 U
B
2 L0
4 M0
5 α
comm
10 p - high
act
11 p - low
act
7 p
comm
Slave
(II) must be set to
comm