Maintenance
344 PRS-7367
Check whether this fault is caused by an external circuit.
Carry out the input and output test for the relay device by test instrument.
If it is determined that the fault belongs to the relay device, please contact CYG for repair
or replacement
12.3.2 Software Failure
1) Check whether the hardware is in trouble or not according to the device alarm signal.
2) Try to restart the device and check if the fault is recoverable if possible.
3) If the fault is not recoverable, please contact CYG for repair or replacement
12.4 Replace Failed Modules
If the failure is identified to be in the relay module and the user has spare modules, the user can
replace the failed modules to recover the protection device.
Repair at the site should be limited to module replacement. Maintenance at the component level is
not recommended.
Before replacement, the user should check that the replacement module has an identical module
name and hardware type-form as the removed module. Furthermore, the replaced module should
have the same software version. For the replaced analog input module and power supply module,
it should be confirmed of the same ratings.
NOTICE!
After replacing modules, it must be checked that the same configuration is set before
and after the replacement. If it is not the case, there is a danger of the unintended
operation of switchgear taking place or of relay device not running correctly. Persons
may also be in danger.
Units and modules must only be replaced while the power supply is switched off and
only by appropriately trained and qualified personnel. Strictly observe the basic
precautions to guard against electrostatic discharge.
Take anti-static measures such as wearing an earthed wrist band and placing modules
on an earthed conductive mat when handling a module. Otherwise, the electronic
components may suffer damage. After replacing the main CPU module, check the
settings and configurations.
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