ABB ACS150 series User Manual page 168

Sleep function for a PID controlled pressure boost pump (when parameter
SLEEP SELECTION is set to 7 = INTERNAL): The water consumption falls at night.
As a 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 the 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 APPLIC MACRO
4022 SLEEP SELECTION
4023 PID SLEEP LEVEL
4024 PID SLEEP DELAY
4025 WAKE-UP DEV
4026 WAKE-UP DELAY
Parameters:
Parameter
1401 RELAY OUTPUT 1
Alarm
PID SLEEP
Additional information
PID control activation
Sleep function activation and source selection
Definition of the start limit for the sleep function
Definition of the delay for the sleep start function
Definition of the wake-up deviation for the sleep function
Definition of the wake-up delay for the sleep function
Additional information
PID sleep function status through the relay output
Additional information
Sleep mode
4022
Appendix: Process PID control
165