Troubleshooting - TAVRIDA ELECTRIC VCB Series User Manual

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.
Failure description
Appearance failure
Excessive contact resistance of ISM
ISM cannot pass power frequency voltage
withstand test at 80 % of rated voltage
ISM cannot perform close/trip operation
1 blink of CM "Malfunction" LED
2 blinks of CM "Malfunction" LED
3 blinks of CM "Malfunction" LED
4 blinks of CM "Malfunction" LED
5 blinks of CM "Malfunction" LED
6 blinks of CM "Malfunction" LED
7 blinks of CM "Malfunction" LED
CM "Malfunction" LED lights continuously
None of CM LEDs lights
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.
104
Table 20 - Typical fault symptoms and methods of their elimination
Possible reason
Mechanical or arc damage, breach of
service conditions
ISM reached the permissible number of
operating cycles or decreasing of insulation
level in ISM vacuum interrupters
ISM vacuum interrupters or insulation
damage
ISM is interlocked
CM failure
Mechanical damage of ISM
Absence of CM power supply
ISM cannot be closed / tripped
ISM actuator coil circuit is interrupted
Short circuit of ISM actuator coil circuit
Manual trip of ISM and ISM is electrically
interlocked
CM is out of the temperature range
ISM state is open without command from
the CM
Internal fault of CM
Absence of CM power supply
Internal fault of CM
Method of elimination
Replacement of failed component
Replacement of ISM
Replacement of ISM
Check ISM interlock state and its actuator coil
connection with connector X3 of CM
Check CM LED states
Replacement of ISM
Check presence of CM power supply, its
polarity and voltage level
Check the circuit of ISM actuator coil
connection with connector X3 of CM, check
state of ISM electrical interlocks
Check the circuit of ISM actuator coil
connection with connector X3 of CM, check
state of ISM electrical interlocks
Check the circuit of ISM actuator coil
connection with connector X3 of CM, check
state of ISM electrical interlocks
Check the ISM and its interlock state
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.
Check the ISM and its interlock state
Replacement of CM
Check presence of CM power supply, its
polarity and voltage level
Replacement of CM