TEL TAVRIDA ELECTRIC VCB15 LD, User Manual

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Table 18 - Typical fault symptoms and methods of their elimination
Failure description Possible reason Method of elimination
Appearance failure Mechanical or arc damage, breach of
service conditions
Replacement of failed component
Excessive contact resistance of ISM ISM reached the permissible number of
operating cycles or decreasing of
insulation level in ISM vacuum
interrupters
Replacement of ISM
ISM cannot pass power frequency
voltage withstand test at 80 % of
rated voltage
ISM vacuum interrupters or insulation
damage
Replacement of ISM
ISM cannot perform close/trip
operation
ISM is interlocked Check ISM interlock state and its
actuator coil connection with
connector X3 of CM
CM failure Check CM LED states
Mechanical damage of ISM Replacement of ISM
1 blink of CM “Malfunction“ LED Absence of CM power supply Check presence of CM power supply,
its polarity and voltage level
2 blinks of CM “Malfunction“ LED ISM cannot be closed / tripped Check the circuit of ISM actuator coil
connection with connector X3 of CM,
check state of ISM electrical interlocks
3 blinks of CM “Malfunction“ LED ISM actuator coil circuit is interrupted Check the circuit of ISM actuator coil
connection with connector X3 of CM,
check state of ISM electrical interlocks
4 blinks of CM “Malfunction“ LED Short circuit of ISM actuator coil circuit Check the circuit of ISM actuator coil
connection with connector X3 of CM,
check state of ISM electrical interlocks
5 blinks of CM “Malfunction“ LED Manual trip of ISM and ISM is
electrically interlocked
Check the ISM and its interlock state
6 blinks of CM “Malfunction“ LED Overheating of CM Stop performing CO operations until
the blinks stop
7 blinks of CM “Malfunction“ LED State of ISM is not defined Check the ISM and its interlock state
CM “Malfunction“ LED lights
continuously Internal fault of CM Replacement of CM
None of CM LEDs lights Absence of CM power supply Check presence of CM power supply,
its polarity and voltage level
Internal fault of CM Replacement of CM
The ISM or CM removal and the installation of the new one should be performed according to chapter 4. The
checks and tests after substitution are described in chapter 5.