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6.2 Cautions
6.2.1
Safety Precautions
CAUTION
• The relay rack is provided with an earthing terminal.
Before starting the work, always make sure the relay rack is earthed.
• 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 drawout/insert the relay unit.
• 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.
• If dc power has not been supplied to the relay for two days or more, then all fault records, event
records and disturbance records and internal clock may be cleared soon after restoring the
power. This is because the back-up RAM may have discharged and may contain uncertain
data. The internal clock must be set again.
• Be careful that the relay is not damaged due to an overcurrent or overvoltage.
• If settings are changed for testing, remember to reset them to the original settings. For the
settings, refer to Section 4.2.7.
Failure to observe any of the precautions above may cause damage or malfunction of the relay.
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