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• Open the left-side front panel by unscrewing the two binding screws located on the right side
of the panel.
• Detach the module holding bar by unscrewing the binding screw located on the left side of the
bar.
• Unplug the ribbon cable running among the modules by nipping the catch (in case of black
connector) and by pushing the catch outside (in case of gray connector) on the connector.
• Pull out the module by pulling up or down the top and bottom levers.
• Insert the replacement module in the reverse procedure.
• After replacing the SPM module, input the user setting values again.
For failed module tracing and its replacement, see Appendix Q.
6.7.4 Resumption of Service
After replacing the failed module or repairing failed external circuits, take the following
procedures for the relay to restore the service.
• Switch on the DC power supply and confirm that the "IN SERVICE" green LED is lit and the
"ALARM" red LED is not lit.
Note: Supply DC power after checking that all the modules are in their original positions and the
ribbon cables are plugged in.
• Supply the AC inputs and reconnect the trip outputs.
6.7.5 Storage
The spare relay or module should be stored in a dry and clean room. Based on IEC Standard
60255-6 the storage temperature should be
−25°C to +70°C, but the temperature of 0°C to +40°C
is recommended for long-term storage.