TAVRIDA ELECTRIC VCB Series, Руководство пользователя, Страница: 104 / 142

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7.3 Troubleshooting
If during installation, commissioning, operation or maintenance any non-conformity occurs, contact your
nearest Tavrida Electric sales representative. The contact data and web site links are listed at the end of this
document. In case of a non-conformity any repairs are strictly prohibited without permission from the sales
representative. To be sure that a non-conformity occurred, please perform the checks as mentioned in Table
20 prior to contacting our regional representative.
Table 20 - 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
CM is out of the temperature range
Stop performing CO operations until the
blinks stop if temperature is above the
temperature range or move CM into
environment with higher temperature if
temperature is below the temperature range.
7 blinks of CM “Malfunction“ LED
ISM state is open without command from
the CM
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 0. The
checks and tests after substitution are described in chapter 5.