Pump switch-out
If the pump controlled by the converter runs at a speed lower than the switch-out threshold
(p29528 + p1080) and the PID error is lower than the switch-out threshold (-p29523) for a
specified time (p29525), the converter switches off a pump based on the selection mode.
Note
If the PID error drops below the overcontrol threshold (-p29526), the converter skips the delay
time (p29525) and performs the switch-out operation immediately.
Parameter p29522 is used to define the selection mode for switching out motors. Bits 00 to 03
of r29529 indicate the motor which is stopped depending on p29522.
● p29522 = 0: Selecting the next pump according to the fixed sequence. The converters first
switches off a pump (OFF2) which runs in converter operation (following the sequence M4
→ M3 → M2 → M1), and then captures a running pump and switches it from line operation to
converter operation.
● p29522 = 1: Selecting the next pump according to the operating hours. The converter first
switches out the pump with the most absolute operating hours (p29530[0...3]).
– If the pump with the most absolute operating hours is controlled by the converter, the
converter first switches off this pump, and then captures a running pump in line operation
and switches it to converter operation.
– If the pump with the most absolute operating hours is connected to the line supply, the
converter directly switches off this pump.
Advanced commissioning
6.3 Pump control
SINAMICS G120XA converter
204 Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
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