M-system MGA-100 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...................................................(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
• Designed specifically for AC power supplies up to 2 amps
• 2A fuse provided to protect the power source in case of
breakdown of discharge element itself due to surges in far
excess of peak voltage
• Power indicator LED provided
• Simple installation with compact plug-in construction
■SPECIFICATIONS
BETWEEN LINES
LINE TO GND
MGA-100 MGA-200
Discharge voltage (p-p) 190V min. 410V min. 410V min.
Max. surge voltage* 400V max. 800V max. 800V max.
Leakage current <2mA
@150V DC
<2mA
@300V DC
<1mA
@300V DC
Response time <0.1 μsec.
Discharge current 1000A (8 / 20 μsec.)
Max. load current 2A
Rated line voltage 120V AC or 170V DC (MGA-100)
250V AC or 350V DC (MGA-200)
*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
in order to ensure adequate life span and operation.
■WIRING
• DO NOT perform dielectric strength tests with wires con-
nectedtotheunit.Otherwisetheelementwillstartdischarg-
ing at discharge voltage,which can cause insulation failure.
Be sure to return the wires after the test.
■FUSE
• Even when a strong lightning surge exceeding discharge
current capacity of lightning arrester enters to power
supply cables, the MRESTER protects the equipment to
some extent but its discharge element may fail. The fuse
will be blown in such a case, which is indicated with the
monitor LED turned OFF. We recommend that you im-
mediately replace the M-RESTER with a new one.
■AND ....
• We recommend that you keep spare M-RESTERs so that
you can replace them when necessary.
COMPONENT IDENTIFICATION
Body
Monitor LED
Terminal Cover
Specification Label
LIGHTNING SURGE PROTECTOR FOR POWER SUPPLY USE
(2A; rack-mounted) MODEL
MGA-100/MGA-200
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8271 Rev.4 P. 1 / 3
INSTRUCTION MANUAL

INSTALLATION
Refer to the following drawings.
■EXTERNAL DIMENSIONS unit: mm (inch)
102 (4.02)
3 (.12)
51 (2.01)
80 (3.15)
TERMINAL COVER
2–4.3 (.17) dia.
MTG HOLE
7–M3.5 SCREW
8 (.31)
91 (3.58)
99 (3.90 )
25 (.98)
12
3
56
78
MONITOR LEDs
ch.1
ch.2
■MOUNTING REQUIREMENTS mm (inch)
91 (3.58) 83 (2.27)
26 (1.02)
ANGLE BRACKET
2–M3.5 SCREW
TERMINAL CONNECTIONS
Connect the unit as in the diagram below.
Be sure to cross-wire between the Ground terminal (3) and
metallic housing of the protected equipment. (100W max.)
M-RESTER
PROTECTED
EQUIPMENT
7
1
V(–)
U(+)
V(–)
U(+)
3
5
G
Connection example with Ch.1
■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.
MGA-100 / MGA-200
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8271 Rev.4 P. 2 / 3

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:
■CHECKING
WIRING
• Make sure that wiring is done as instructed in the con-
nection diagram.
• Make sure that the Ground terminal (3) is connected to
the metallic housing of protected equipment.
• Make sure that the Ground terminal (3) is grounded to
earth.
■DISCHARGE FUNCTION
Remove all the wires connected to the M-RESTER and test
its discharge capability as follows:
• Apply 150V DC across the terminals (1) – (7) and (2) – (8)
with a resistor of approx. 10kW in serial. Measure leak-
age current. (≤1mA standard) Check also that the power
indicator LED is ON.
• Then apply 250V DC and check that discharging occurs.
(≥2mA standard)
• Apply 300V DC across the following terminals and meas-
ure leakage current. (≤1mA standard)
Terminals (1) – (3), (7) – (3), (2) – (3), (8) – (3)
• Then apply 500V DC and check that discharging occurs.
(≥2mA standard)
• If DC power source is not available, check resistance
across the following terminals on the high resistance
range of multimeter (infinite standard).
Terminals (1) – (7), (1) – (3), (7) – (3), (2) – (8), (2) – (3), (8) – (3)
• Check that discharging occurs across the same terminals
with a 500V DC megger. (Indicator of the megger reaches
over-scale.)
• If any of the above tests shows negative, replace the whole
M-RESTER unit.
MGA-100 / MGA-200
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8271 Rev.4 P. 3 / 3