Crompton Controls M20 - Manual (Page 43)

42 Troubleshooting Emotron AB 01-2551-01r4
The monitor always
gives an alarm
- Check the alarm levels in windows 11 to 14.
If incorrect readjust the levels or perform an
Auto set.
- Check if the monitor is programmed for “latched
alarm” (window 61=on). If so reset the monitor by
pressing the reset key.
Window 00 shows “LU”
or “OU”. Under- or over-
voltage alarm. Switch off the supply:
-
Check that the supply voltage agrees
with the voltage range on the monitor type plate.
Window 01 shows
“oor”. “Out Of Range”
alarm.
- The measured shaft power is higher than 125% of
the rated motor power programmed in window 41.
Window 03 shows
“oor”. “Out Of Range”
alarm. - The measured motor current is higher than 125%
of the rated motor current programmed in window
42.
Over and undervoltage
is not detected
This is only detected at monitor power up and not dur-
ing continued operation. The relays will not trip, only
indication in the display.
The alarm relays are not
switching - Check that the wire links between terminals 6
and 7 are removed as per “Wiring”.
Not all windows are
shown When the special functions are used (windows 35, 65
etc.) blocked windows for settings are not shown.
Problem Solution