Crompton Controls M20 - Manual (Page 42)

Emotron AB 01-2551-01r4 Troubleshooting 41
10 Troubleshooting
Ensure that the installation has been correctly carried out, e.g. check the termi-
nals and that the cables are properly stripped. The monitor is maintenance-free.
However, you should regularly check wirings and terminals etc.
Problem Solution
Window 01 always
shows zero load, even if
the motor is running
- Check the connection of the current
transformer(s).
- Check that the value of the rated motor power in
window 41 is the same as the rated motor power on
the motor plate.
- Check that window 03 shows a phase current
value that agrees with with the rated motor
current.
Window 01 shows an
improper power value
when the motor is run-
ning
- Check that the motor is not oversized for its applica-
tion, check power transmission and gear ratio.
- Check that there is a load on the motor during
normal operation.
- Check that the change in motor load is greater than
about 3% (window 01).
- Check that the current transformer is connected in
phase L1.
Window 03 shows an
improper value for the
phase current
- Check that the current transformer has been
selected as per Tables 1 and 2.
- Check that the number of windings is as per Tables
1 and 2.
- Check that the value of the motor current in
window 42 is the same as the value of the motor
current on the motor plate.
The monitor never gives
an alarm
- Check that window 01 shows a value greater than
zero.
- Check the alarm levels in windows 11 to 14. If in-
correct readjust the levels or perform an Auto set.