MMAJ
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-8155 Rev.2 P. 4 / 4
CHECKING
■
WIRING
• Make sure that wiring is done as instructed in the con-
nection diagram.
• Make sure that the Earth terminal is connected to the
metallic housing of protected device.
• Make sure that the Earth terminal is connected to earth.
MAINTENANCE
Even lightning in remote locations could induce surges
without our knowledge. Regular checking of the surge pro-
tector is important to find degradations in early stage, be-
fore and after the storm seasons, and whenever you experi-
ence a strong lightning storm.
DO NOT attempt checking or replacing the surge protector
during a thunderstorm for safety.
Checking procedure is as explained below.
■
MONITOR LED & ALARM
Configure the state of the monitor LED and the alarm out-
put with the power voltage supplied. Replace in case of fail-
ure/breakdown.
MONITOR
LED
ALARM OUTPUT
A1 – C
A2– C
Normal
ON
Open
Close
Failure/ Power OFF
OFF
Close
Open
■
SIMPLE CHECK
The alarm output or the monitor LED could be broken even
with no indication. The steps below explain a simple proce-
dure to check it.
1. Remove all wiring connected to the M-RESTER.
2. Confirm there is no conduction across the terminals indi-
cated below, with a 100/125 V DC insulation tester.
TERMINALS
DUE RESULT
U – PE
≥ 10MΩ
V – PE
3. Check with a 1000 V DC insulation tester across the ter-
minals indicated below and confirm it discharges.
TERMINALS
DUE RESULT
U – PE
≤ 2MΩ
V – PE
4. Turn on the power supply with no load and measure the
current flowing into the M-RESTER.
MODEL
DUE RESULT
MMAJ-100xxY
≤ 6mA
MMAJ-200xxY
MMAJ-100xxA
≤ 20mA
MMAJ-200xxA
If any of the above tests shows negative, replace the M-
RESTER.
