Note
When using the multi-pump control for the first time, make sure that the circuit breakers are
disconnected until the relevant parameters are configured.
Note
When the multi-pump control is enabled (p29520=1), the values of p1274 and p1264 are set to
0 automatically and you can modify the values if required.
Note
Motor current peaks when switching the motor from converter operation to line operation
If the motor is switched from converter operation to the line supply, this can result in a high
surge current > 10 x I_rated in the motor, depending on the random phase shift between
converter and line voltage.
Further information
Interaction with other functions:
● When activating the essential service mode, if the multi-pump control is active, the motor
connection status remains unchanged and the converter-controlled motor switches the
speed setpoint to "ESM setpoint source".
● When activating the hibernation mode, if the multi-pump control is active, the hibernation
mode only works when there is only one operating motor and the conditions for hibernation
are satisfied.
6.3.1.1
Pump switch-in/switch-out
Pump switch-in
If the pump controlled by the converter runs at the maximum speed (p1082) and the PID error
(r2273) exceeds the switch-in threshold (p29523) but is lower than the overcontrol threshold
(p29526) for a specified time (p29524), the converter first switches the pump from converter
operation to line operation, and then switches on an idle pump. This pump is softly started with
a ramp-up speed and runs in converter operation mode.
Note
If the PID error rises above the overcontrol threshold (p29526), the converter skips the delay
time (p29524) and performs the switch-in operation immediately.
Advanced commissioning
6.3 Pump control
SINAMICS G120XA converter
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Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
Summary of Contents for SINAMICS G120XA
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