TAVRIDA ELECTRIC ISM15_LD_1 Series, Application Manual

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Malfunction Indication Table
The self-monitoring system inside the CM detects eventual malfunctions and report them via the MALFUNCTION LED
with various blink signals. The meaning of the blink codes and the variations per type of malfunction are shown in
the following table.
Error
group
Malfunction
LED blinks
Function, type
of malfunction
Description of malfunction
variants
Recommendation
for malfunction
elimination
Affected
CM
External
error
1 blink signal,
then 1.5 s
pause, periodic
(about 4 mi The power supply
has failed for
>1.5 s The operating range of the power sup-
ply of the CM, depending on the type
of voltage, its value and switch com-
mand, is between 65-70% and 125%
(Trip commands) and 80-125% (Close
commands) of the nominal voltage.
With continuous failure of the power
supply, the blink signals continue
until the capacitors are unloaded. - Switch on MCB
- Check for cable
break
- Check terminal
connections All CM
2 blink signals,
then 1.5 s
pause, periodic The Close or Trip-
command of the CM
is carried out but
the corresponding
ISM position signal
is missing. Malfunction variant 1: The Close
command of the CM is carried out
by the ISM. The normally open
ISM auxiliary switch S13 has been
bridged already due to a malfunction
before the Close command was given
(despite the existing malfunction,
the ISM can be switched off again by
the CM. This deletes the malfunction
indication although the malfunction
still exists).
- Check for short
circuit in the
cable
- Check for short
circuited terminals
- Check ISM posi-
tion switch S13 All CM
Malfunction variant 2: The Trip
command of the CM is carried out
by the ISM. The normally closed
ISM auxiliary switch S13 has been
interrupted due to a malfunction (the
ISM can only be placed in the close
position after the malfunction has
been eliminated).
- Check for cable
break
- Check terminal
connections
- Check ISM posi-
tion switch S13
The Close command
of the CM is not car-
ried out as the ISM
is electrically locked
in OFF position. Malfunction variant 3: The Close
command of the CM is not carried out
by the ISM as the closing lock-out
contact in ISM S13 auxiliary switch
circuit is open. The malfunction
indication has been purposely taken
into account.
Closing of the ISM
is only possible if
closing lock-out
contact is closed.
The Close or Trip
command of the CM
is not carried out by
the ISM as the ISM
is mechanically
locked in the
particular position. Malfunction variant 4: The Close
command of the CM is not carried
out by the ISM as it is mechanically
locked in the OFF position.
Delete malfunction
with Trip command.
The ISM can only
be closed when the
mechanical lock has
been removed.
Malfunction variant 5: The Trip
command of the CM is not carried
out by the ISM as it is mechanically
locked in the ON position.
Remove the
mechanical lock
of the ISM.
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