Bosch rexroth SYDFE1 2X Series Operating Instructions Manual page 36

36/96 Pressure and flow control system SYDFE1 series 2X, 3X | Product description
U
B
L0
pc (I)
omm
P
U
Changing over to master/
slave operation
Bosch Rexroth AG, Edition 10.2021, RE 30011-B
Circuitry of SYDFE1 with control electronics without power limitation (VT 5041-
3X/1...)
30a/32a U
B
28a 0 V
14c α
comm
SWA 12c
act
16c GND
6c p
comm
4c GND
8c p - high
act
10c p - low
act
22a M0
Master
Fig. 14: Circuitry of SYDFE1 for master/slave and independent individual operation
Notes:
• The connection for the position transducer of the pump is not drawn here.
• 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.
Changing over to master/slave operation
0 V reference potentials of the PLC/command value source and GND/0 V of the
SYDFE1 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.
Set the flow command value to a low value (e.g. 10 %).
When a pre-load valve is used, the pump with the pre-load valve should preferably
be the master pump.
Only in conjunction with VT 5041-3X/3-...(Fig. 13)
At low operating pressures, the flow command value, which has been provided by
the control, is withdrawn from the slave pump via a changeover contact suitable
for small signal voltages (or, alternatively, a wear-free analog switch), and the
actual swivel angle value provided by the VT 5041-3X control electronics of the
master pump is connected.
The pressure command value of the slave pump is to be set to 100 % (if required,
using a second changeover contact or by means of software) in order that closed-
loop pressure control of this unit is quasi switched off.
Only in conjunction with VT 5041-3X/1-... and version VT 5041-3X/2...: (Fig. 14)
In the case of control electronics without power limitation: High signal to contact
18a.
Master/slave operation ON
SWA (II)
comm
p (II)
comm
P
U
30a/32a U
B
28a 0 V
18a Master/slave J4: ON
14c SWA
comm
18c SWA master
act
16c GND
20c GND
6c p
comm
4c GND
8c - high
pact
10c p - low
act
22a M0
Slave