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 occurrence.
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.
POWER PILOT LAMP
• Supply appropriate AC voltage through the M-RESTER
and check the LEDs. When the LED is off despite that
power is supplied, replace the M-RESTER.
DISCHARGE FUNCTION
Turn off the power supply and remove all wiring connected
to MRESTER before testing its discharge capability as fol-
lows:
• Check resistance across the following terminals on the
high resistance range of multimeter (infinite standard).
MH-1201, MH-2201: Terminals U-W, U-G, W-G
MH-2203: Terminals U-V, U-W, U-G, V-W, V-G, W-G
• Check that discharging occurs across the same terminals
with a 500V DC megger. (Indicator of the megger reaches
over-scale.)
• If any of the above tests shows negative, replace the M-
RESTER.
MH-1201 / MH-2201 / MH-2203
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-8181 Rev.6 P. 4 / 4
