MD7JS
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-8064 Rev.2 P. 4 / 4
■
CONNECTION DIAGRAM
Protected Side
Surge Side
M-RESTER
5
2
6
3
7
8
DISCHARGE
ELEMENT
4
5
6
8
4
1
2
3
7
1
Surge Side
Protected Side
M-RESTER
DIN RAIL ADAPTOR
(for grounding)
DIN RAIL
DIN RAIL ADAPTOR
(for grounding)
DIN RAIL
DISCHARGE
ELEMENT
Self-synch Transmitter
*
1. Oxide coating of an aluminium rail may lower the electric conductivity between this module and the ground. Use a steel or copper rail.
*
2. Be sure to ground the DIN rail. Recommended grounding resistance ≤100 Ω
*
3. Cross-wire between the DIN rail and the metal housing of the protected device to equalize the earth potential.
Ground only the surge protector when the protected device has no ground terminal.
S2
S1
S3
DISCHARGE
ELEMENT
DISCHARGE
ELEMENT
INPUT
–
U
V
+
OUTPUT
POWER
(Protected Device)
U
V
u
v
Surge Protector
for Power Supply
G
S3
S2
S1
R1
R2
SELF-
SYNCH
u
v
U
V
Surge Protector
for Power Supply
G
POWER
Grounding
*
2
Grounding
*
2
Crossover Wire
*
3
Crossover Wire
*
3
*
1
*
1
Series Resistance
Series Resistance
U
U
U
U
U
U
WIRING INSTRUCTIONS
■
EURO TERMINAL
Torque: 0.3 N·m
Applicable wire size: 0.2 – 2.5 mm
2
Stripped length: 8 mm
MAINTENANCE
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.
Checking procedure is explained in the following:
■
CHECKING
WIRING
1) Make sure that wiring is done as instructed in the con-
nection diagram.
2) Make sure that the DIN rail is connected to the metal
enclosure of protected device.
3) Make sure that the surge protector is securely attached
to the DIN rail, and that the rail is grounded to earth.
■
DISCHARGE ELEMENT
1) Remove all wiring connected to the surge protector when
you test the module.
2) Check resistance across the following terminals on the
high resistance range of multimeter (measuring current
≤ 0.25 µA) and confirm no conduction.
Terminals (4) – (5), (4) – (6), (5) – (6),
(4) – (DIN rail), (5) – (DIN rail), (6) – (DIN rail)
The tester should show 1 MΩ or greater for the terminals
(4) – (5), (4) – (6) and (5) – (6), 10 MΩ or greater for other
sets of terminals.
3) Confirm conduction across the same terminals with a 500
V DC 1000 MΩ insulation tester. The tester should show
20 MΩ or less.
4) If any of the above tests shows negative, replace the
surge protector.
