Example - ABB ACS355 series User Manual

156 Program features


Example

The time scheme below visualizes the operation of the sleep function.
Motor speed
Sleep level
Actual value
Sleep function for a PID controlled pressure boost pump (when parameter
SLEEP SELECTION
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, 4122...4126
t = Sleep delay (4024)
d
t<t
d
(4023)
Wake-up deviation
(4025)
is set to INTERNAL): The water consumption falls at night. As a
Additional information
PID control activation
Sleep function settings
t
d
Control panel
display:
PID SLEEP
Stop
Wake-up delay
(4026)
t
Start
t
4022