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 (No. 5 or 10) is con-
nected to the metallic housing of protected equipment.
• Make sure that the ground terminal (No. 5 or 10) is
grounded to earth.
■
DISCHARGE ELEMENTS
Remove all wiring connected to M-RESTER when you test
the discharge elements.
• Check resistance across the following terminals on the
high resistance range of multimeter (infinite standard).
When measuring across (6) – (7), connect the multimeter
so that positive voltage is applied to (6) terminal.
Terminals (6) – (7), (6) – (10), (7) – (10),
(8) – (10), (9) – (10)
• Check resistance across the terminal (8) – (9) on the high
resistance range of multimeter of 0.3V or less (infinite
standard).
• 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.
MDK-LC
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-8136 Rev.4 P. 3 / 3