M-system MDPA-24, MDPA-65 Instruction Manual

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]

EM-8258 Rev.2 P. 1 / 3

INSTRUCTION MANUAL

LIGHTNING SURGE PROTECTOR FOR

STANDARD SIGNAL LINE & PULSE USE (life monitor)

MODEL

MDPA-24
MDPA-65

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:

Surge protector (Head element + Base) ........................... (1)

DIN rail mounting adaptor* .............................................. (1)

Screws for DIN rail mounting (M4 × 8)* .......................... (2)

*Included with option code /A33
(Base section is optional.)

■ 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 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 4 – 20mA DC and pulse signal
line including both 4-wire and 2-wire transmitters

• Life monitor function helps you to decide when you
should replace the surge protector; reduces maintenance
and prevents downtime

• Pressing CHK (Check) button confirms the degradation
and life span of the surge protection circuits with LEDs

• Absorbs surges only without affecting instrumentation signal

• No interruption of signal by unplugging surge protector element

■ SPECIFICATIONS

LINE TO LINE LINE TO

EARTH

MDPA-24 MDPA-65

Max. continuous
operating voltage (Uc)

30V 70V ±160V

Voltage protection level
(Up) @1kV (100A)

45V 85V ±650V

Voltage protection level
(Up) @2kV (1kA)

50V 100V ±650V

Leakage current
(new device)

≤ 5µA

@30V DC

≤ 5µA

@70V DC

≤ 5µA

@±140V DC
Capacitance @1 MHz ≤ 1000 pF ≤ 1000 pF ≤ 100 pF
Response time ≤ 4 nsec. ≤ 4 nsec. ≤ 20 nsec.
Max. line voltage 30V 70V ---­Max. discharge current (Imax)

5000A (8 / 20 µs)

Nominal current (I

N) 100mA

Internal series resistance

20 Ω ±10% including return

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) with relative humidity within 30 to 85% RH
in order to ensure adequate life span and operation.

■ WIRING

• Do not install cables close to noise sources (relay drive
cable, high frequency line, etc.).

• Do not bind the surge protector’s cables together with
those in which noises are present. Do not install them in
the same duct.

■ DIELECTRIC STRENGTH TEST

• Loosen the screw located at the left-center of the element
and remove the element module from the base before
conducting a dielectric strength testing. Otherwise the
element will start discharging at a voltage exceeding the
max. continuous operating voltage (Uc), which can cause
insulation failure of the module.

Be sure to return the element and fasten securely after

the test.

■ BATTERY LIFE

• The battery’s life is assured for 10 years from the manu­facturing date indicated at the right-top of the specifica­tion label (when used ≤ 2 minutes/month).

• The battery continues to discharge even while it is un­used. We recommend not to store the Element module for
a long period of time.

■ 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 suffi­cient protection.

MDPA-24 / MDPA-65

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]

EM-8258 Rev.2 P. 2 / 3

COMPONENT IDENTIFICATION

M·RESTER

MADE IN JAPAN

SER.NO

BAT

ALM

MODEL

Ground Terminal (G)
(used as mounting bracket)

Head Element

Base

Specifications

Head Element is secured to Base
with screw when the surge protector
is shipped from Factory.

■ FRONT PANEL CONFIGURATION

P–P+

S

–

S+

BAT Indicator LED

ALM Indicator LED

CHK Check Button

INSTALLATION

In order to separate the head element from the base, loosen
the screw located at the left-center of the element.

■ WALL MOUNTING

Refer to the drawings below.

• EXTERNAL DIMENSIONS unit: mm (inch)

P–P+

S–S+

23.5 (.93)

80 (3.15)

2–5 (.20) dia.
MTG HOLE

90 (3.54)

100 (3.94)

4–M4 TERMINAL SCREW

GROUND TERMINAL (G)
(used as mounting bracket)

27 (1.06)53 (2.09)

80 (3.15)

45 (1.77)

HEAD ELEMENT

BASE

1 (.04)

• MOUNTING REQUIREMENTS unit: mm (inch)

25 (.97) min.

2–M4 SCREW

90 (3.54)

■ DIN RAIL MOUNTING (Only for /A33)

1. MOUNTING ONTO THE ADAPTOR

Before DIN rail mounting, secure the mounting bracket of
MDP to the mounting adaptor with a screw provided with
this product. In this step, secure at one point.

DIN Rail Mounting Adaptor

M•RESTER

2. DIN RAIL MOUNTING

Set the base socket so that its mounting slider is at the bot­tom. Position 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 mounting slider utilizing a minus
screwdriver and pull.

DIN Rail Mounting Slider

35 mm wide

DIN Rail

3. GROUNDING

Secure the mounting bracket at the other point with the
other screw. In this step, secure the grounding wire togeth­er with the screw.

M•RESTER

Solderless Ter

minal

• MOUNTING REQUIREMENTS unit: mm (inch)

80 (3.15)

45 (1.77)

8.5

(.33)

1 (.04)

[3.3 (.13)]

DIN RAIL
35mm wide

4

(.18)

2–M4 MOUNTING SCREW
(used as ground terminal (G))