ALARM OUTPUT
When the MAL’s discharge element gradually degrades, its
increased leakage current causes high temperature. Op-
tional alarm output is available to detect high temperature
by thermal breaker and trips discrete signal. If the alarm
output should be transmitted remotely via outdoor cables, a
surge protector for signal line is required.
Choose a circuit breaker with an alarm output. Configure
a logical addition sequence so that the alarm trips when
booth or either of the MAL or the breaker alarm trips.
■
RELAY SPECIFICATIONS
Alarm output:
Normal close relay
Short-circuited at normal operation
Open-circuited at abnormal operation
Rated load:
250V AC @0.5A (resistive load)
■
CONNECTION
Terminal: Euro type connector terminal
Applicable wire size: 0.2 to 1.5 mm
2
Stripped length: 7 mm
Torque: 0.25 N·m
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.
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 thunder storm for safety.
Checking procedure is as explained below:
■
CUTTING OFF POWER SUPPLY
Cut off the circuit breaker and confirm no power supply to
prevent electric shock while maintenance.
■
CHECKING EXTERIOR
If discoloration or deformation is observed, replace with a
new one immediately
■
RETIGHTENING
If the cables are loosened, retighten the terminal blocks.
■
CHECKING ALARM OUTPUT
Optional normal close relay output is open-circuited, re-
place with a new one immediately.
■
CHECKING OPPERATION OF THE CIRCUIT BREAKER
When the circuit breaker operates repeatedly, the MAL may
be degraded. Conduct following “CHECK WITH AN INSU-
LATION TESTER”.
■
CHECK WITH AN INSULATION TESTER
Remove all wires and check the discharging occurs across
the terminals with an insulation tester. If an abnormality
is proved, replace new one immediately.
• Checking insulation
Check insulation across the terminals to confirm no conduc-
tion.
MODEL
INSLATION RESISTANCE RANGE
DUE RESULT
MAL-230
250 V DC, 1000 MΩ
≥ 100 MΩ
MAL-400
500 V DC, 1000 MΩ
≥ 100 MΩ
• Checking discharging occurs
Check insulation across the terminals to confirm that the
surge protector operates normally.
MODEL
INSLATION RESISTANCE RANGE
DUE RESULT
MAL-230
1000 V DC, 1000 MΩ
≤ 2 MΩ
MAL-400
1500 V DC, 1000 MΩ
≤ 2 MΩ
MAL
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-8162 Rev.1 P. 8 / 8
