7.9.6 Hydraulic Soft Start with Separate Acceleration Ramp
Code Name Setting range Default Min. Attri.
F4.20 p/Q command soft start delay 0.0...1,000.0 s 0.0 0.1 Stop
F4.21 Minimum pressure command limit 0.0...[F4.22] bar 5.0 0.1 Stop
F4.23 Minimum flow command limit 0...[F4.24] rpm 200 1 Stop
F4.25 Acceleration time hydraulic soft start 0.1...6,000.0 s 5.0 0.1 Run
Tab. 7-19: Parameter list of hydraulic soft start
Soft start function is designed to reduce the p/Q command and acceleration
during start up period to minimize the too high of acceleration or potential over
current condition during start up. Once this function is active (set F4.20 > 0),
the p/Q commands and acceleration time will be switched to F4.21, F4.23 and
F4.25, in a time period of F4.20 after every run command.
Only when p/Q command soft start is active will the acceleration
time hydraulic soft start function be activated.
Please notice, by using high power motor if additional start frequen-
cy holding time (E0.37) is needed, please make sure F4.20 > E0.37
to ensure the soft start function.
Fig. 7-17: Hydraulic soft start
FcP 5020
Bosch Rexroth AG
Block Diagram of Main Functions
DOK-RCON03-FCP5020****-QU04-EN-P
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