MAINTENANCE
Check M-RESTER periodically. Many cases of lightning are
ignored, and even lightning at a far distance often causes
inductive surges.
We recommend that you check your M-RESTER about twice
a year, before and after the rainy season. Check whenever
you experience a strong lightning occurence.
Checking procedure is explained in the following:
■
CHECKING
WIRING
• Make sure that wiring is done as instructed in the con-
nection diagram.
• Make sure that the Ground terminal (G) is connected to
the metallic housing of protected equipment.
• Make sure that the Ground terminal (G) is grounded to
earth.
ALARM INDICATOR LED
• Check that the power is suplied.
• When the green LED is off despite that power is sup-
plied, the discharge element may be failed. Replace the
M-RESTER.
DISCHARGE FUNCTION
Remove all wiring connected to M-RESTER and test its dis-
charge capability as follows:
• Check resistance across the following terminals (infinite
standard).
Terminals (U) – (V), (U) – (G), (V) – (G)
• Check that discharging occurs across the following termi-
nals with a 1000V DC megger. (Indicator of the megger
reaches over-scale.)
Terminals (U) – (V), (U) – (G), (V) – (G)
LEAKAGE CURRENT (between lines)
Apply supply voltage across the terminals (U) – (V) with
no load, and measure current at the terminal (U). (≤5mA
standard)
• If any of the above tests shows negative, replace the
MRESTER.
MMAH
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
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