Woodward SEG HighPROTEC MRA4, Device Manual

Page: 339 / 510

CLPU - Supervision Module Cold Load Pickup
CLPU - Supervision Module Cold Load Pickup
Available stages:
CLPU
This Supervision Module enables protection against faulty tripping of the Overcurrent Protection that might be
alarmed by the increased currents caused by the re-energizing after outages.
During normal operation the thermostatically load (refridgerators, heatings, residental air conditions) is
diversified. After an extended outage all these devices are switched on at the same time.
In addition to that motors evoke inrush currents when they are re-energized.
Both effects might cause an unwanted alarm/trip of the overcurrent protection stages.
If the CPLU -Module detects an Cold Load, the following countermeasures against unwanted tripping are
available.
•
Blocking of the Overcurrent Protection
•
Increase the tripping thresholds respectively the tripping times by means of Adaptive Parameters.
This Module issues a Signal only (it is not armed).
In order to take influence on the tripping settings of the overcurrent
protection you have to assign the signal „CPLU.E
FFEKTIVE
“ onto an Adaptive
Parameter Set. Please refer to chapter Parameter / Adaptive Parameter Sets.
Within the Adaptive Parameter Set you have to modify the tripping
characteristic of the overcurrent protection according to your needs.
EN MRA4 04/09 Page 339