MDR-8
P. 2 / 2
EM-8131 Rev.6
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
INSTALLATION
Refer to the figure below.
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EXTERNAL DIMENSIONS mm (inch)
P1
PROTECT
SIDE
SURGE
SIDE
S1
P2
S2
P3
S3
P4
S4
P5
S5
P6
S6
P7
S7
P8
S8
COM
COM
GND
GND
130 (5.12)
145 (5.71)
160 (6.30)
70 (2.76)
95 (3.74)
25 (.98)
40 (1.57)
4–4.5 (.18) dia.
MTG HOLE
20–M3 SCREW
•When mounting, no extra space is needed between units.
TERMINAL CONNECTIONS
Connect the unit as in the diagram below.
Be sure to cross-wire between the ground terminal (G) and
that
of the protected equipment.
TELEMETER
PLC
XMTR
M-RESTER
PROTECTED
EQUIPMENT
M-RESTER
P1
P2
P8
G
COM
RELAY
METAL
HOUSING
FIELD
S1
S2
S8
COM
S1
S2
S8
G
G
COM
P1
P2
P8
COM
All negative lines are connected to COM.
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.
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 sea-
son. Check whenever you experience a strong lightning oc-
currence. Checking procedure is explained in the following:
n
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.
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 and confirm no con-
duction. (The meter will show 10MΩ or greater.) Termi-
nals (P1) or (P2) or (P3) or (P4) or (P5) or (P6) or (P7) or
(P8) – (COM), (COM) – (G) When measuring across the
Px – COM, apply the positive voltage to the Px terminal.
• Check that discharging occurs across the same terminals
with a 500V DC/1000MΩ megger. (The megger will show
20MΩ or less.)
• If any of the above tests shows negative, replace the M-
RESTER
