Pump Switch-In/Switch-Out - Siemens SINAMICS V20 Operating Manual

Pump switch-in/switch-out

The inverter uses four relays (KP1 to KP4), which are connected to digital outputs DO1 to
DO4, to switch pumps in and out according to the PID error (r2273). In addition, two groups
of contactors, KDs and KMs, are used to switch the pumps between inverter operation and
line system operation. Soft pump switching can be realized as all motors start/stop with ramp
speeds, so as to minimize the shock to the pipes.
Main circuit
Note
The maximum voltage on DO1 is ± 35 V DC. The maximum load current on DO1 is 100 mA.
SINAMICS V20 multi-pump control
Operating Manual, 05/2018, A5E43416874-002
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