MG MAX Bedienungsanleitung

EM-8175 Rev.7 P. 1 / 4

MAX

MG CO., LTD. www.mgco.jp

5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN

LIGHTNING SURGE PROTECTOR FOR POWER SUPPLY USE

(5A; high discharge current capacity) MODEL MAX

INSTRUCTION MANUAL

BEFORE USE ....

Thank you for choosing us. 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 our sales ofﬁce or representatives.

■PACKAGE INCLUDES:

Lightning surge protector

(body + base socket + surge absorber element) ............... (1)

■MODEL NO.

Conﬁrm that the model number described on the product is

exactly what you ordered.

■INSTRUCTION MANUAL

This manual describes necessary points of caution when you

use this product, including installation, connection and basic

maintenance procedures.

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 direct

hit by lightning.

M-Rester must be installed according to this installation /

instruction manual.

GENERAL

■ FUNCTION & FEATURES

• Designed speciﬁcally for AC power supplies up to 5 amps

• Discharge current capacity 10000 A

• Absorbs surges only without affecting instrumentation signal

• No power supply interruption even when the surge absorber

is broken

• Relay contact turns ON with surge absorber failure

• Surge absorber element replaceable without power interruption

■ SPECIFICATIONS

BETWEEN LINES LINE TO

GND

MAX-100 MAX-200

Discharge voltage (p-p)

190 V min. 410 V min. 640 V min.

Max. surge voltage* 350 V max. 700 V max. 800 V max.

Leakage current ≤ 1 mA

@150V DC

≤ 1 mA

@300V DC

≤ 1 mA

@300 V DC

Response time ≤0.01 µsec.

Discharge current 10000 A (8 / 20 µsec.)

Max. load current 5 A

Internal series resist. ≤ 0.5 Ω including return

*The maximum voltage that could pass through M-RESTER. Pro-

tected equipment must be able to withstand this voltage for a very

short time period.

POINTS OF CAUTION

■ ENVIRONMENT

• Indoor use.

• When heavy dust or metal particles are present in the atmos-

phere,install M-RESTER inside proper housing and ventilate it.

• Do not install the M-RESTER where it is subjected to continu-

ous vibration. Do not apply physical impact to the M-RESTER.

• Environmental temperature must be within -10 to +55°C (14

to 131°F) with relative humidity within 30 to 90% RH in order

to ensure adequate life span and operation.

■ WIRING

• Remove cables connected to the ground terminals (2 or 7) from

the base socket before insulation test. Otherwise the element

will start discharging at discharge voltage, which can cause

insulation failure. 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

MAX

Model No. Label

for Surge Absorber Element

Body Base Socket

Specification

Label

Surge Absorber

Failure Indicator Hole

Surge Absorber Element

(model: MEL)

■FRONT PANEL CONFIGURATION

Model No. Label

for Surge Absorber

Element

Surge Absorber

Failure Indicator Hole

Surge Absorber

Element

Model sufﬁx code of the surge absorber element (model: MEL)

changes according to the line voltage. Use correct model and

sufﬁx code when ordering.

EM-8175 Rev.7 P. 2 / 4

MAX

MG CO., LTD. www.mgco.jp

5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN

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 next drawings.

■ GROUNDING

A cross-over wire between M-RESTER and ground or metallic

EM-8175 Rev.7 P. 3 / 4

MAX

MG CO., LTD. www.mgco.jp

5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN

EXTERNAL DIMENSIONS unit: mm (inch)

3456

2187

80 (3.15)

50 (1.97) 103 (4.06)

123 (4.84)7 (.28) [3.3 (.13)]

80 (3.15)

(.79)

35.4 (1.39)

40 (1.57)

50 (1.97)

7.8 (.31)

CLAMP

(top & bottom)

DIN RAIL

35mm wide

SURGE ABSORBER

ELEMENT (model: MEL)

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. (100 Ω max.)

ALARM OUTPUT

PROTECTED

EQUIPMENT

(load side)

POWER

SOURCE

(surge side)

BREAKER

Be sure to install

the Breaker.

■ GROUNDING

M-RESTER PROTECTED

EQUIPMENT

CROSSOVER WIRE

GROUNDING

(100 Ωor less)

A crossover wire between M-RESTER ground and the ground or

metallic housing of the equipment is required for protection.

SURGE ABSORBER ELEMENT

When a strong lightning surge exceeding discharge current

capacity of lightning arrester enters to power supply cables,

conventional lightning arrester cuts off the supply line with its

fuse blown in order to prevent ignition.

The model MAX is designed to separate its surge absorber element

(model: MEL) from power supply lines when there is anomaly

with the element. It ensures no interruption of power supply

and thus the plant itself.

The MEL indicates its failure with contact output (ON) and front

indicator (turns white). In such condition, maximum surge volt-

age may be up to 800 V. Replacing the MEL as soon as possible

is recommended.

■ REPLACING THE MEL

Replacing the MEL is very simple without interruption of power

supply.

Pull the MEL off from the main body, and replace with a new one.

Insert it to the connector. (See the ﬁgure below.)

The replacement MEL is available with following model No.

MEL-100: for 100V/110V/120V AC power

MEL-200: for 200V/220V/240V AC power

We recommend that you keep spare MELs so that you can replace

them when necessary.

MEL Connector

MEL

EM-8175 Rev.7 P. 4 / 4

MAX

MG CO., LTD. www.mgco.jp

5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN

MAINTENANCE

Check M-RESTER periodically. Many cases of lightning are

ignored, and even lightning at a far distance often causes in-

ductive 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

WIRING

• Make sure that wiring is done as instructed in the connection

diagram.

• Make sure that the Ground terminal (2 or 7) is connected to

the metallic housing of protected equipment.

• Make sure that the Ground terminal (2 or 7) is grounded to earth.

ALARM CONTACT AND INDICATOR

• M-RESTER is designed to protect the equipment even when

subjected to a lightning surge exceeding its discharge cur-

rent capacity to certain extent. However, in such a case, the

insulation of its discharge element may fail. When it hap-

pens, a relay contact turns ON and the indicator on the front

panel of M-RESTER turns white.

Replace the surge absorber element, model MEL according

to the procedure described in the left.

DISCHARGE FUNCTION

Remove the MEL and test its discharge capability as follows:

• Check resistance across the terminals (B) – (L) (inﬁnite

standard).

• Check that discharging occurs across the same terminals with a

1000V DC megger. (Indicator of the megger reaches over-scale.)

MEL SIDE VIEW

LEAKAGE CURRENT (between lines)

Return the MEL and apply supply voltage across the terminals

(1) – (8) with no load, and measure current at the terminal (1).

(≤ 1 mA standard)

• If any of the above tests shows negative, replace the MEL 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.

MAIN BODY UNIT TEST

• Remove the MEL and all wiring and check resistance across

the following terminals. (≤ 0.5 Ω standard)

Terminals (1) – (4), (5) – (8)

• With the MEL and all wiring detached,check resistance across

the following terminals. (inﬁnite standard)

Terminals (1) – (8), (1) – (7), (7) – (8)

• Check that discharging occurs across the same terminals with a

1000V DC megger. (Indicator of the megger reaches over-scale.)

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