M-system MDR2 Bedienungsanleitung

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

Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: info@m-system.co.jp

EM-8106 Rev.1 P. 1 / 3

INSTRUCTION MANUAL

LIGHTNING SURGE PROTECTOR FOR MULTI-CHANNEL USE

(high discharge current capacity) MODEL MDR2

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.

■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 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

• Protection for semiconductor switches of discrete outputs

against lightning surge damage

• Applicable to both negative and positive common signals

• Applicable to multi analog signals (non-isolation between

channels)

• Space saving with multi-channel protectors

• LED monitor indicating degradation of voltage limiter

• LED monitor driven by discrete I/O signal without auxil-

iary power supply

■SPECIFICATIONS

Max. Continuous operating voltage (Uc)

MDR2

-8NY -8NA -8PY -8PA

Between each of S1 to S8 lines ±30V

Each line to COM* +30V -30V

Each line or COM to Earth ±150V

* MDR2 is operational as an SPD despite less than +2V (for

MDR2-8PA) or more than -2V (for MDR2-8NA). However,

the function of the monitor LED is not guaranteed.

Voltage protection level (Up)

• @1kV / 100A (1.2 / 50µs)

MDR2

-8NY -8NA -8PY -8PA

Between each of S1 to S8 lines ±40V ±50V ±40V ±50V

Each line to COM +40V +50V -40V -50V

Each line or COM to Earth ±500V

• @4kV / 2kA (1.2 / 50µs)

MDR2

-8NY -8NA -8PY -8PA

Between each of S1 to S8 lines ±60V

Each line to COM +50V +60V -50V -60V

Each line or COM to Earth ±600V

Leakage current @max. voltage

Line to COM: 5μA

Line to line: 5μA

COM to Earth: 5μA

Response time: ≤ 4 ns

Max. discharge current (Imax)

Line to COM: 10kA

Line to line: 10kA

COM to earth: 10kA

Nominal current (IN): 150mA

Internal series resistance: 22Ω ±20%

MDR2

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

Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: info@m-system.co.jp

EM-8106 Rev.1 P. 2 / 3

POINTS OF CAUTION

■ENVIRONMENT

• Indoor use.

• When heavy dust or metal particles are present in the

air, install the surge protector inside proper housing with

sufﬁcient ventilation.

• Do not install the surge protector where it is subjected to

continuous vibration. Do not subject the unit to physical

impact.

• Environmental temperature must be within -5 to +55°C

(23 to 131°F) and relative humidity within 30 to 90% RH

in order to ensure adequate life span and operation.

■DIELECTRIC STRENGTH TEST

• DO NOT perform dielectric strength tests with wires con-

nected to the surge protector. Otherwise the element will

start discharging at discharge voltage, which can cause

insulation failure.

Be sure to return the wires after the test.

■AND ....

• We recommend that you keep spare surge protectors so

that you can replace them when necessary.

• Lightning surge can enter not only through signal lines

but also through power supply lines. We recommend that

you also use the surge protectors for power line for sufﬁ-

cient protection.

COMPONENT IDENTIFICATION

PROTECT

SIDE

MONITOR

SURGE

SIDE

COM

Body

*Only available with MDR2-8xA

LED Monitor

Protected Side

Terminal

Surge Side

Terminal

■REAR VIEW

Specifications

INSTALLATION

Refer to the ﬁgure below.

■EXTERNAL DIMENSIONS unit: mm (inch)

PROTECT

SIDE

MONITOR

SURGE

SIDE

COM

20–M3.5 SCREW

4–4.5 (.18) dia.

MTG HOLE

40 (1.57)

25 (.98)

95 (3.74)

70 (2.76)

160 (6.30)

145 (5.71)

130 (5.12)

LED MONITOR

*Only available with MDR2-8xA

MDR2

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

Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: info@m-system.co.jp

EM-8106 Rev.1 P. 3 / 3

TERMINAL CONNECTIONS

Connect the unit as in the diagram below.

Be sure to cross-wire between the ground terminal (G) and

that of the protected equipment.

TELEMETER

PLC

XMTR

M-RESTER

PROTECTE

EQUIPMENTM-RESTER

COM

RELAY

METAL

HOUSING

FIELD

COM

G G

COM

■GROUNDING

M-RESTER PROTECTED

EQUIPMENT

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.

■WIRING

PROTECT

SIDE

MONITOR

SURGE

SIDE

When the connections of serge and protecting sides get bun-

dled, the protection effect decreases. Be sure to wire them

separately.

Wiring to the terminals, please install wires according to

the above ﬁgure.

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

WIRING

1) Make sure that wiring is done as instructed in the con-

nection diagram.

2) Make sure that the ground terminal (G) is connected to

the metallic housing of protected equipment.

3) Make sure that the ground terminal (G) is grounded to

earth.

DISCHARGE ELEMENTS

Approximate checking can be conducted as following.

• MDR2-8xA (with LED monitor)

1) Make sure that the front LED monitor turns OFF while

the discrete signal is ON.

2) When leakage current exceeds the rating (5μA), the LED

becomes brighter gradually. In this case, please replace

the unit.

3) When the discrete signal is unable to be ON, take the

same procedure as MDR2-8xN.

• MDR2-8xY (without LED monitor)

Remove all wiring connected to M-RESTER when you test

the discharge elements.

1) Check resistance across the following terminals on the

high resistance range of multimeter and conﬁrm no con-

duction. (The meter will show 10MΩ or greater.)

Terminals (P1) or (P2) or (P3) or (P4) or (P5) or (P6)

or (P7) or (P8) – (COM), (COM) – (G)

When measuring across the Px to COM, apply the positive

voltage for MDR2-8N or negative voltage for MDR2-8P with

multimeter.

1) Check that discharging occurs across the same terminals

with a 500V DC/1000 MΩ insulation tester. (The tester

will show 20 MΩ or less.)

2) If any of the above tests shows negative, replace the

M-RESTER.

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