ABB ACS150 User Manual page 17

consequence, the PID process controller decreases the motor speed. However, due
to natural losses in the pipes and the low efficiency of the centrifugal pump at low
speeds, the motor does not stop but keeps rotating. The sleep function detects the
slow rotation, and stops the unnecessary pumping after the sleep delay has passed.
The drive shifts into sleep mode, still monitoring the pressure. The pumping restarts
when the pressure falls under the allowed minimum level and the wake-up delay has
passed.
Settings:
Parameter
9902
4022...4026
Parameters:
Parameter
1401
Alarm
PID SLEEP
Additional information
PID control activation
Sleep function settings
Additional information
PID sleep function status through RO
Additional information
Sleep mode
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