Bosch rexroth SYDFE1 2X Series Operating Instructions Manual page 23

Product description | Pressure and flow control system SYDFE1 series 2X, 3X
In the case of pump variants with external supply this operating mode is
somewhat complicated in terms of engineering and commissioning, because a
pump swiveling in too far (e.g. -75 % instead of -70 %) causes cavitation. We
therefore recommend master/slave operation as an alternative with two closed-
loop controlled SYDFE1 systems or pump variant 0541 for SYDFE1-3X.
Continuous operation is possible when the given operating limits are adhered to.
However, at a total displacement of "zero" (that is, at a negative swivel angle of
the SYDFE1 pump) and at high pressures, the noise level increases and efficiency
deteriorates.
For pumps with external supply, the use of a pressure relief and anti-cavitation
feature as shown in Fig. Fig. 7 on page 23 is indispensable to prevent the
pump's running dry.
p max 0,2 bar
Pressure relief/anti-
cavitation valve required in
the case of external supply
Fig. 7: Circuit diagram for continuous regenerative operation
-100 -90 -80 -70 -60
Fig. 8: Operating limits for series SYDFE1-2X and SYDFE1-3X with special rotary group for
continuous regenerative operation
Q 1
p[bar] p[bar] p[bar] p[bar]
280
250
Motor operation
200
Control system for continuous
regenerative operation:
SYDFE1 2X or 3X
150
• NG 18...100 with SO 0487 or
0541
• NG 140
100
50
-50 -40 -30 -20 -10 +10 +20 +30 +40 +50 +60 +70 +80 +90 +100
0
RE 30011-B, Edition 10.2021, Bosch Rexroth AG
Q 2 max < 0,7 Q 1
SYD_023
Pump operation
23/96
Ist [%]
SYD_014