154 Program features
Example The time scheme below visualizes the operation of the sleep function. Motor speed
td = Sleep delay (4024) t<td td Control panel display:
Sleep level (4023)
PID SLEEP Stop
Actual value
Start
t
Wake-up delay (4026) Wake-up deviation (4025) t
Sleep function for a PID controlled pressure boost pump (when parameter 4022 SLEEP SELECTION 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
Additional information
9902 4022…4026, 4122…4126
PID control activation Sleep function settings
Diagnostics Parameter
Additional information
1401 1402/1403/1410
PID sleep function status through RO 1 PID sleep function status through RO 2…4. With option MREL-01 only. Additional information Sleep mode
Alarm PID SLEEP