Example; Settings; Diagnostics - ABB ACS350 User Manual

Example

The time scheme below visualises the operation of the sleep function.
Motor speed
Sleep level
par. 4023
Actual value
Wake-up deviation
par. 4025
Sleep function for a PID controlled pressure boost pump (when parameter 4022 is
set to 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
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

Diagnostics

Alarm
PID SLEEP
Parameter
1401
t = Sleep delay, parameter 4024
d
t = Wake-up delay, parameter 4026
wd
t<t t
d d
Text on display
SLEEP MODE
STOP
Additional information
PID control activation
Sleep function settings
Additional information
Sleep mode
Additional information
PID sleep function status through RO
t
START
t
wd
t
123
Program features