MDPA-24 / MDPA-65
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-8258 Rev.2 P. 3 / 3
TERMINAL CONNECTION
Connect the unit as in the diagram below.
Be sure to cross-wire between the Ground terminal (G) and
that of the protected equipment. When the surge protec-
tor is connected with a device which has no ground termi-
nal such like M-System’s (See figure below), ground the
M-RESTER Ground terminal (G) only.
M-RESTER
IN
M-RESTER
CURRENT LOOP SUPPLY
CENTRAL
STATION
FIELD
(PROTECTED
EQUIPMENT)
FROM
FIELD
TO
CENTRAL
STATION
+
–
P–
P+
S–
S+
P–
P+
S–
S+
CABLE
G
G
+
–
G
■
GROUNDING
M-RESTER
PROTECTED
EQUIPMENT
G
G
CROSSOVER WIRE
GROUNDING
(100 ohms or less)
A crossover wire between M-RESTER ground and the ground or
metallic housing of the equipment is required for protection.
If the protected equipment has no ground terminal, ground the
M-RESTER only.
When the M-RESTER is mounted with DIN Rail Mounting Adapter,
connect the grounding wire to the mounting screw of the M-RESTER.
WIRING INSTRUCTIONS
■
SCREW TERMINAL
Torque: 0.8 N·m
MAINTENANCE
■
WIRING
1) Make sure that wiring is done as instructed in the con-
nection diagram.
2) Make sure that the Ground terminal (G) is connected to
the metallic housing of protected equipment.
3) Make sure that the Ground terminal (G) is grounded to
earth.
■
HEAD ELEMENT MODULE
Check surge protectors periodically. Many cases of light-
ning are ignored, and even lightning at a far distance often
causes inductive surges.
We recommend that you check your surge protector about
twice a year, before and after the rainy season. Check
whenever you experience a strong lightning occurrence.
DO NOT test it during a thunder storm.
For testing, press CHK (Check) button on the front and LED
tuns on or off according to the surge protector’s condition as
shown in the table below.
• Discharge Element Status Table
Normal
: ON
*
1 : With pulsating line signal or that containing ripples, the LED may
flicker or blink when the voltage limiter is degraded.
: OFF
Normal
Discharged
Normal
Near End
End of Life
Unable to Judge
Normal
Degraded
*
1
No Need
Near
Battery
ALM
BAT
Discharge
Element
Voltage
Limiter
Replacement
Immediately
Required
Replace the had element module to a new one immediately
when the LEDs indicate so.
