M-system MMH-1 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 + arrester module + power relay) .........................(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 cer-
tain extremely high voltages caused by a direct or almost
direct hit by lightning.
M-RESTER must be installed according to this installa-
tion / instruction manual.
GENERAL
■FUNCTION & FEATURES
The model MMH, designed specifically for power require-
ments of medium capacities (10 or 30 amps), protects elec-
tronic equipment from lightning surges induced through
power cables.
Conventional lightning arrester utilizes a fuse to prevent
fire when it is damaged by surges far more exceeding its
capacity. It shuts the power supply line off, and eventually
affects overall plant operations.
The MMH, on the other hand, only separates the damaged
arrester module model MEH from the line by driving the
power relay.
When a leakage current detected inside the MEH exceeds
approx. 100mA, the MMH drives and latches the power
relay, which is indicated by closed alarm contact and red
ALARM LED on the front.
The alarm contact is reset when the MEH is removed from
its socket or when the power is turned off.
When the alarm is indicated, the surge voltage between
lines is increased up to 800V. Replace the MEH with a new
one as soon as possible.
■SPECIFICATIONS
BETWEEN LINES LINE TO
GND
MMH-1 MMH-2
Discharge voltage
130V AC min. 285V AC min. 285V AC min.
Max. surge volt. (p-p)* 350V max. 700V max. 800V max.
Leakage current ≤50mA
@110V AC
≤30mA
@220V AC
≤1mA
@220V AC
Response time ≤0.01 µsec.
Discharge current 10000A (8 / 20 µsec.)
Max. load current 10A (MMH-x10) or 30A (MMH-x30)
Voltage drop ≤1V (50/60 Hz)
*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 at-
mosphere, 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
and humidity within 30 – 90% RH in order to ensure ad-
equate life span and operation.
■DIELECTRIC STRENGTH TEST
• DO NOT perform dielectric strength tests for the MMH.
The arrester module is grounded to the metallic hous-
ing inside the unit. The discharge element will start
discharging between line and ground when a dielectric
strength test is performed.
■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 supply side of the M-RESTER.
■ALARM CONTACT
• During NORMAL operation, it is possible for the ALARM
LED to remain OFF and the ALARM contact to turn ON
momentarily when experiencing lightning surges. Please
continue use of the unit as this is standard operation.
LIGHTNING SURGE PROTECTOR FOR POWER SUPPLY USE
(10 – 30A; replaceable arrester module) MODEL MMH
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8179 Rev.4 P. 1 / 4
INSTRUCTION MANUAL

COMPONENT IDENTIFICATION
Terminal Assignment Label
(bottom)
Terminal Board
(power supply side)
Specification Label
Terminal Assignment Label
(top)
Body
Specification Label for MEH
Alarm LED
RUN LED
Terminal Board
(protected
equipment side)
Power Relay
Arrester Module
(model: MEH)
■FRONT PANEL CONFIGURATION
ARRESTER MODULE (model: MEH)
ALARM LED
RUN LED
Specification Label
for MEH (top)
The MEH’s model suffix codes change
according to the power input voltage.
Check the specification on the label.
MMH
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8179 Rev.4 P. 2 / 4

INSTALLATION
Refer to the drawings below.
■EXTERNAL DIMENSIONS unit: mm (inch)
10 (.39)
6 (.24)
40 (1.57)20 (.79) 20 (.79) 147 (5.79)
80 (3.15)
230 (9.06)10 (.39) 10 (.39) 250 (9.84)
8–M4 SCREW
TERMINAL
10 (.39)
4 5 6 7
1 2 3
ALARM LED
ARRESTER MODULE
(model: MEH)
RUN LED
■MOUNTING REQUIREMENTS mm (inch)
230 (9.06)
40 (1.57)
4–M5 SCREWS
TERMINAL CONNECTIONS
Connect the unit as in the diagram below.
Be sure to cross-wire between the terminal 3 and the ground terminal of the protected equipment. (100Ω max.)
6
4
3 G
5
1
2
U
V
B
BREAKER
AC POWER
SOURCE
Be sure to install a breaker.
M-RESTER PROTECTED
EQUIPMENT
ALARM
*
*Turns on at the alarm condition.
7
■GROUNDING
M-RESTER PROTECTED
EQUIPMENT
G
G
CROSSOVER WIRE
GROUNDING
(100 ohms or less)
A crossover wire between M-RESTER ground and ground or metallic
housing of equipment is required for protection.
If the protected equipment has no ground terminal, ground the
M-RESTER only.
MMH
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8179 Rev.4 P. 3 / 4

ARRESTER MODULE ELEMENT
The MEH indicates its failure with contact output (ON) and
front indicator LED (red). In such condition, replace the
MEH as soon as possible.
■REPLACING THE MEH
Remove the screws attaching the clamps to the MMH body,
and pull the MEH off. Plug a new MEH into the socket and
secure the clamps with the screws. (See the figure below.)
MEH Socket
MEH
MEH MTG HOLE
2–3 (.12) dia.
• Clamps
Clamp Guide
Clamp
The replacement MEH is available with following model No.
MEH-1: for 100V/110V AC power
MEH-2: for 200V/220V AC power
We recommend that you keep spare MEHs so that you can
replace them when necessary.
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 season. Check whenever
you experience a strong lightning occurrence.
Checking procedure is explained in the following:
■CHECKING
A) ALARM Contact and LED:
Check the ALARM contact relay status and its LED on
the front of the MEH. When the red light is turned ON,
unplug the MEH and return it again, and check that the
light is still ON. Then replace the MEH according to the
procedure described in the left. If the light turns OFF
when you return it, continue use of the unit as this is
standard operation.
B) RUN LED:
If the RUN LED (green) remains OFF when you turned
the power supply ON, replace the MEH.
C) Wiring:
Make sure that the terminal (3) is connected to the me-
tallic
housing of the unit and that of protected equipment.
D) Discharge Function of the MEH:
Remove the MEH and test its discharge capability as fol-
lows:
• Check resistance across the following terminals: (3) – (4),
(3) – (6), (4) – (6) (infinite standard).
• Check that discharging occurs across the same terminals
with a 1000V DC megger. (Indicator of the megger reach-
es overscale.)
•
E) Leakage Current (between lines)
Return the MEH and apply supply voltage across the
terminals (1) – (2) with no load, and measure current at
the terminal (1). (≤50mA standard for MEH-1; ≤30mA
for MEH-2)
4
1
5
8
3
2
6
7
MEH
Rear View
(pin terminals)
F) If any of the above tests shows negative, replace the MEH
after that you confirm that the main body unit functions
properly with the following tests. If the following tests
show negative, replace the whole M-RESTER unit.
G) Main Body Unit Test
• Remove the MEH and all wiring and check resistance
across the following terminals. (≤0.5Ω standard)
Terminals (1) – (4), (2) – (5)
• With the MEH and all wiring detached, check resistance
across the following terminals. (infinite standard)
Terminals (1) – (2), (1) – (3), (2) – (3)
• Check that discharging occurs across the same terminals
with a 1000V DC megger. (Indicator of the megger reach-
es overscale.)
MMH
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8179 Rev.4 P. 4 / 4