M-system MDH User manual

BEFORE USE ....
Thank you for choosing M-System. Before use, please check
contents of the package you received as outlined below.
If you have any problems or questions with the product,
please contact M-System’s Sales Office or representatives.
■PACKAGE INCLUDES:
Lightning surge protector (body + base socket) ................(1)
■MODEL NO.
Confirm Model No. marking on the product to be exactly
what you ordered.
■INSTALLATION / INSTRUCTION MANUAL
This manual describes necessary points of caution when
you use this product, including installation, and basic main-
tenance procedure.
LIMITATION APPLICABLE TO M-RESTER
The M-Rester will protect electronics equipment from
damage caused by lightning by absorbing most of the
surge voltages.
However, M-Rester may not be effective against certain
extremely high voltages caused by a direct or almost di-
rect hit by lightning.
M-Rester must be installed according to this installa-
tion/ instruction manual.
GENERAL
■FUNCTION & FEATURES
• Designed specifically for DC power supplies up to 5 amps
• Discharge current capacity 2000A
• Absorbs surges only without affecting instrumentation
signal
• Indicator LEDs ON with surge absorber failure
• Fuse provided for detaching the discharge elements
■SPECIFICATIONS
BETWEEN LINES LINE TO GND
MDH-12 MDH-24 MDH-48
Discharge voltage 24V min. 50V min. 88V min. ±380V min
Max. surge voltage* 70V max. 140V max. 210V max. ±700V max.
Leakage current ≤15mA
@15V DC
≤15mA
@30V DC
≤20mA
@70V DC
≤1mA
@±380V DC
Response time ≤0.1 µsec.
Discharge current 2000A (8 / 20 µsec.)
Max. load current 5A
Voltage drop ≤1V
*The maximum voltage that could pass through M-RESTER.
Protected equipment must be able to withstand this voltage
for a very short time period.
POINTS OF CAUTION
■ENVIRONMENT
• When heavy dust or metal particles are present in the
atmosphere,
install M-RESTER inside proper housing and ventilate it.
• Do not install the M-RESTER where it is subjected to
continuous
vibration. Do not apply physical impact to the M-RESTER.
• Environmental temperature must be within -5 to +55°C
in order to
ensure adequate life span and operation.
■WIRING
• Remove cables connected to the ground terminals (2, 3, 6
or 7) from the base socket before conducting a dielectric
strength test. Otherwise the element will start discharg-
ing at discharge voltage, which can cause insulation fail-
ure. Be sure to return the cables as they were after the
testing is complete.
■RATED CURRENT
• Be sure that the rated current of protected equipment
does not exceed the maximum load current specification
of the M-RESTER.
• Be sure to install a breaker which matches the current
rating at the power source side of the M-RESTER.
COMPONENT IDENTIFICATION
Body Base Socket
Specification
Label
■FRONT PANEL CONFIGURATION
Alarm LED (two)
LIGHTNING SURGE PROTECTOR FOR POWER SUPPLY USE
(DC power use) MODEL MDH
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8169 Rev.5 P. 1 / 3
INSTRUCTION MANUAL

INSTALLATION
Detach the yellow clamps located at the top and bottom of the unit for separating the body from the base socket.
■DIN RAIL MOUNTING
Set the base socket so that its DIN rail adapter is at the bottom. Hung the upper hook at the rear side of base socket on the
DIN rail and push in the lower. When removing the socket, push down the DIN rail adapter utilizing screwdriver (–) and pull.
Clamp
(top & bottom)
DIN Rail
35mm wide
Spring Loaded
DIN Rail Adaptor
Shape and size of the base socket are
slightly different with various socket types.
■WALL MOUNTING
Refer to the drawings below
■EXTERNAL DIMENSIONS mm [inch]
3456
2187
80 [3.15]
50 [1.97] 103 [4.06]
123 [4.84] (3.3 [.13])
80 [3.15]
20
[.79]
40 [1.57]
50 [1.97]
7.8 [.31]
CLAMP
(top & bottom)
DIN RAIL
35mm wide
2 – 4.5 [.18] dia.
MTG HOLE
15 [.59] deep
8
– M3.5
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 (2 or 7) and metallic housing of the protected equipment. (100Ω max.)
4
7
5
1
8
OUTPUTINPUT
M-RESTER
P+
G
P–
+
–
+
–
+
–
S+
S–
G
Lightning Arrester
for Signal Line
Cable
DC POWER
Protected
Equipment
Ground one of the terminals 2, 3, 6 and 7.
+
–
■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.
MDH
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8169 Rev.5 P. 2 / 3

ALARM INDICATOR LED
The front LEDs turn ON when the power is supplied, and
OFF in an abnormality.
When one or more LEDs are OFF, check the following:
1) Measure voltage across the power supply terminals with
a multimeter.
2) When DC power supply is confirmed, replace the M-
RESTER with a new one.
3) When the voltage is 0V, supply appropriate DC voltage
and check the LEDs. If one or more LEDs are OFF, re-
place the MRESTER with a new one.
MAINTENANCE
Check M-RESTER periodically. Many cases of lightning are
ignored, and even lightning at a far distance often causes
inductive surges.
Even with the alarm indicator LEDs on the MDH unit, we
recommend that you check your M-RESTER 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
• Make sure that wiring is done as instructed in the con-
nection diagram.
• Make sure that the Ground terminal (2, 3, 6 or 7) is con-
nected to the metallic housing of protected equipment.
• Make sure that the Ground terminal (2, 3, 6 or 7) is
grounded to earth.
■DISCHARGE FUNCTION
Remove all the wires before testing its discharge capability
as follows:
• Check resistance across the terminals indicated below.
(Indicator of the tester shows ≥10MΩ.)
(1) – (8), (1) – (2), (8) – (2)
• Check that discharging occurs across the same terminals
with a 500V DC megger. (Indicator of the megger shows
≤20MΩ.)
• If any of the above tests shows negative, replace the whole
MRESTER unit.
MDH
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8169 Rev.5 P. 3 / 3