Bosch Rexroth CytroPac Operating Instructions Manual page 52

52/84 Commissioning
Bosch Rexroth AG, CytroPac, RE 51055-B/06.17
Prestart function
With the prestart function, a drop in operating pressure can be compensated. This
occurs, if larger actuators are connected.
• The prestart function is activated via digital signal 15X1 at pin 7. This way, no more
than two pressure ratings (15X1 at pin 8) are available for selection.
• By means of the prestart function, the operating pressure can be increased
depending on the time-related switching of actuators. Make sure that the possible
increase in operating pressure does not cause any undesired effects.
For activation, proceed as follows:
1. Make sure that parameter F1.03 is set to 1.
2. Set the function of the digital input 15X1 at pin 7:
– Parameter F2.19 = 20 (pressure drop compensation trigger)
3.
Set the function for pressure drop compensation in parameter F4.45,
e.g. F4.45 = 50 (corresponds to a pressure command value increase of 50 bar).
Experience has shown that the lowest pressure drop occurs at prestart activation
of 50 to 100 ms prior to connection of hydraulic actuators. For further
information, refer to chapter 7.9.4 of the Sytronix quick guide, see chapter 1.2
"Required and amending documentation".
Flow command value adjustment
The admissible flow command value (maximum speed) depends on various factors
like pump size, power unit performance class or operating pressure and must be set
in compliance with application-specific requirements.
• Use the performance diagram specified in the CytroPac document 51055 or
contact the Bosch Rexroth customer service.
• Inadmissibly set flow command values can lead to an overload of the power unit.
• The flow command value can also be changed during running operation. Command
values entered in the software become immediately effective in the process!
Flow command value adjustment for "Basic" and "Advanced" configurations:
1. Make sure that parameter F1.11 is set to 0.
2.
Set the required flow command value (maximum speed) in parameter F1.12.
In "Premium" configuration, the flow command value is defined via the multi-
Ethernet interface.