M-system MMA 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 10 amps
• Discharge current capacity 10000A
• Absorbs surges only without affecting instrumentation
signal
• Indicator LED turns off with surge absorber anomaly
• Fuse provided for preventing ignition caused by failure of
surge absorber
■SPECIFICATIONS
BETWEEN LINES LINE TO
GND
MMA-100 MMA-200
Discharge voltage 190V min. 410V min. 680V min.
Max. surge voltage* 350V max. 700V max. 800V max.
Leakage current ≤4mA
@150V DC
≤4mA
@300V DC
≤0.1mA
@300V DC
Response time ≤0.01 µsec.
Discharge current 10000A (8 / 20 µsec.)
Max. load current 10A
Internal series resist. ≤0.5Ω including return
*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
• The discharge element incoporated in the M-RESTER is
grounded to its housing. Therefore, DO NOT do an insu-
lation test. If you do, the element will start discharging
between line and ground at the discharge voltage value.
■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.
■AND ....
• We recommend that you keep spare M-RESTERs so that
you can replace them when necessary
COMPONENT IDENTIFICATION
U
V
G
Terminals,
Protected Equipment Side
Body
Specification
Label
Terminals,
Cable Side
Alarm Indicator LED
■FRONT PANEL CONFIGURATION
U
V
G
u
v
SURGE
SIDE
PROTECT
SIDE
ALM
LIGHTNING SURGE PROTECTOR FOR POWER SUPPLY USE
(10A; high discharge current capacity) MODEL MMA
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8173 Rev.5 P. 1 / 3
INSTRUCTION MANUAL

INSTALLATION
Refer to the drawings below.
■EXTERNAL DIMENSIONS mm (inch)
50 (1.97)
110 (4.33)
70 (2.76)
20 (.79)65 (2.56)
77 (3.03)
85 (3.35)
8 (.31)
U
V
G
u
v
4–4 (.16) dia.
SURGE
SIDE
PROTECT
SIDE
ALM
■MOUNTING REQUIREMENTS mm (inch)
50 (1.97)
77 (3.03)
90 (3.54) min.
77 (3.03) 4–M3
SCREW
TERMINAL CONNECTIONS
Connect the unit as in the diagram below.
Be sure to cross-wire between the Ground terminal (G) and metallic housing of the protected equipment. (100Ω max.)
MMD-24
S2
S1
P2
P1
–
+
4 – 20mA
DC
MMA-100
MMA-200
BREAKER
Be sure to
install
the breaker.
V
U
v
u
AC
Source
V
U
G
G
G
EQUIP-
MENT
■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.
MMA
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8173 Rev.5 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
season. Check whenever you experience a strong lightning
occurence.
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 (G) is connected to
the metallic housing of protected equipment.
• Make sure that the Ground terminal (G) is grounded to
earth.
ALARM INDICATOR LED
• M-RESTER is designed to protect the equipment even
when subjected to a lightning surge exceeding its dis-
charge current capacity to certain extent. However, in
such a case, the insulation of its discharge element may
fail. When it happens, the fuse is blown and the green
LED on the front panel of M-RESTER turns off.
• Maximum surge voltage in this condition may be up to
800V.
• When the green LED is off despite that power is supplied,
replace the M-RESTER.
DISCHARGE FUNCTION
• Remove all wiring connected to M-RESTER and test its
discharge capability as follows:
• Check resistance across the following terminals (infinite
standard). Terminals (U) – (V), (U) – (G), (V) – (G)
• Check that discharging occurs across the following ter-
minals with a 500V DC megger. (Indicator of the megger
reaches over-scale.)
Terminals (U) – (V), (U) – (G), (V) – (G)
LEAKAGE CURRENT (between lines)
Apply supply voltage across the terminals (U) – (V) with
no load, and measure current at the terminal (U). (≤5mA
standard)
• If any of the above tests shows negative, replace the M-
RESTER.
MMA
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8173 Rev.5 P. 3 / 3