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6.2 Cautions
6.2.1 Safety Precautions
CAUTION
• The relay rack is provided with a grounding terminal.
Before starting the work, always make sure the relay rack is grounded.
• When connecting the cable to the back of the relay, firmly fix it to the terminal block and attach
the cover provided on top of it.
• Before checking the interior of the relay, be sure to turn off the power.
Failure to observe any of the precautions above may cause electric shock or malfunction.
6.2.2 Cautions on Tests
CAUTION
• While the power is on, do not connect/disconnect the flat cable on the front of the printed
circuit board (PCB).
• While the power is on, do not mount/dismount the PCB.
• Before turning on the power, check the following:
- Make sure the polarity and voltage of the power supply are correct.
- Make sure the CT circuit is not open.
- Make sure the VT circuit is not short-circuited.
• Be careful that the transformer module is not damaged due to an overcurrent or overvoltage.
• If settings are changed for testing, remember to reset them to the original settings.
Failure to observe any of the precautions above may cause damage or malfunction of the relay.
Before mounting/dismounting the PCB, take antistatic measures such as wearing an earthed
wristband.