Table of Contents
Advertisement
4.5 How to use monitoring functions
4.5.1 MDU Breaker alarms
(1) PAL (load current pre-alarm)
The alarm is output to display/over communication when the load current ≥ the pre-alarm current, and the duration ≥
Alarm details
the pre-alarm operation time (1/2 the long limit time operation time TL).
Do not set it via communication or on the display.
Setting method
For 250 A frame, set it on the PAL module.
For 400/800 A frame, set it on the MDU Breaker.
Set to either self-hold or automatic reset via communication or on the display.
Reset method
Reset method
(2) OVER (overcurrent alarm)
The alarm is output to display/over communication when the load current exceeds 105 to 125% of the current setting
Alarm details
of the circuit breaker.
Setting method
No settings.
Reset method
Automatic reset. (No settings.) Automatically resets when the cause of the alarm is removed.
(3) IDM_AL (electric current demand alarm)
Alarm details
The alarm is output to display/over communication when the electric current demand value (*) exceeds the pick up current.
Set via communication or on the display
Function: ON/OFF
Pick up current: 50 to 100% (per 1%)
Setting method
Demand time limit: 1 to 10 min. (per 1 min), 15, 20, 25, 30 min. (*)
Set to either self-hold or automatic reset via communication or on the display.
Reset method
Reset method
* This differs from the demand time limit for each measurement value.
Measurement
value
Pick up current
Self-hold
Automatic reset
(Factory setting is OFF.)
Self-hold
Automatic reset
Alarm generated
Reset the alarm via communication or on the display.
Automatically resets when the cause of the alarm is removed.
Reset the alarm via communication or on the display.
Automatically resets when the cause of the alarm is removed.
Alarm reset
For automatic reset, the alarm will be reset
if the value falls below the pick up current.
For self-hold, the alarm will be maintained
and will need to be reset manually.
23
Time
Hide quick links:
Advertisement
Table of Contents
