Bosch rexroth SYDFE1 2X Series Operating Instructions Manual page 24

24/96 Pressure and flow control system SYDFE1 series 2X, 3X | Product description
Brief regenerative
operation
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).
Motor
operation
-100 -90 -80 -70 -60 -50 -40
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
J3
ON ON
OFF OFF
• 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.
p[bar] p[bar] p[bar]
280
250
Motor operation
200
Standard rotary group
150
100
50
-30 -20 -10 +10 +20 +30 +40 +50 +60 +70 +80 +90 +100
0
Jumper
J5
OFF
ON
Ist [%]
SYD_028