ABB ACS150 series

165
Appendix: Process PID control
Sleep function for a PID controlled pressure boost pump (when parameter 4022
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
Additional information
9902 APPLIC MACRO
PID control activation
4022 SLEEP SELECTION
Sleep function activation and source selection
4023 PID SLEEP LEVEL
Definition of the start limit for the sleep function
4024 PID SLEEP DELAY
Definition of the delay for the sleep start function
4025 WAKE-UP DEV
Definition of the wake-up deviation for the sleep function
4026 WAKE-UP DELAY
Definition of the wake-up delay for the sleep function
Parameters:
Parameter
Additional information
1401 RELAY OUTPUT 1
PID sleep function status through the relay output
Alarm
Additional information
PID SLEEP
Sleep mode