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Pressure and flow control system SYDFE1 series 2X, 3X
| Product description
Bosch Rexroth AG, Edition 10.2021, RE 30011-B
During brief regenerative operation the variable displacement pump changes over
to motor operation for a limited period of time, e.g. for lowering a load. If the
requirement profile remains within the limits according to Fig. 9, the standard
version of the pump can be used (standard rotary group 0000 or 0479).
50
100
150
200
280
p[bar]
+10 +20 +30 +40 +50 +60 +70 +80 +90 +100
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0
Ist [%]
p[bar]
p[bar]
250
SYD_028
Motor
operation
Motor operation
Standard rotary group
Oper
at
in
g pr
es
sur
e p
HP
(bar)
Fig. 9: Operating limits for series SYDFE1-2X and SYDFE1-3X with standard rotary group for brief
regenerative operation
For standard applications, the command value for the swivel angle is provided
within the voltage range of 0…+10 V; this command value is interpreted by the
control electronics so that the swivel angle of the pump is controlled within the
swiveling range from 0 % displacement to 100 % displacement.
During regenerative operation, depending on the pump combination, a swivel
angle command value of up to -70 % (or -7 V) has to be provided. If the higher-
level control is not able to generate the command value range of -7 V to +10 V, the
normalization of the command value provision can be re-configured using jumpers
J3 and J5.
Table 6: Normalization of swivel angle command value provision
Regenerative
operation
Jumper
J3
J5
ON
ON
OFF
OFF
OFF
ON
• Standard: J3 open; J5 set
Swivel angle command value -10...+10 V ≙ -100…+100 % swivel angle
• Regenerative operation: J3: set; J5 open
Swivel angle command value 0...+10 V ≙ -100 %…+100 % swivel angle or +5 V
corresponds to a swivel angle of 0 %.
Example: A swivel angle of -70 % means “zero” displacement of the pump
combination. In the “regenerative” mode, this corresponds to a command value
provision of +1.5 V for the swivel angle.
Brief regenerative
operation
