M-system MD7LC User manual

EM-8063 Rev.3 P. 1 / 4

INSTRUCTION MANUAL

LIGHTNING SURGE PROTECTOR FOR

STRAIN GAUGE (ultra-slim) MODEL MD7LC

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....................................................................(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.

When using this product in potentially explosive atmos-

phere or hazardous (classiﬁed) location, you have to follow

the safety procedure to install it. Please refer to “SAFE IN-

STALLATION MANUAL” for each type of certiﬁcation.

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

•High discharge current capacity 20 kA (8 / 20 µs), 1 kA

(10 / 350 µs)

•Ultra-thin 7-mm-wide module can be mounted in high

density

•Excellent protection employing multi-stage SPD circuits

•DIN rail mounting and grounding

•Shield terminal provided

•Protects strain gauges and transmitters

■SPECIFICATIONS

See Table 1.

Table 1. Specications

MODEL NO. MD7LC-0 MD7LC-1

Max. continuous operating voltage (Uc)

Output voltage ±0.2V

Excitation 15V

Line to Earth*1±15V

Voltage protection level (Up) Output voltage ±15V @0.2kV (1.2 / 50 µs) ±40V @6kV (1.2 / 50 µs)

Excitation 30V @0.2kV (1.2 / 50 µs) 50V @6kV (1.2 / 50 µs)

Line to Earth*1±30V @0.2kV (1.2 / 50 µs) ±50V @6kV (1.2 / 50 µs)

Leakage current @Uc Output voltage ≤0.2µA

Excitation ≤2µA

Line to Earth*1≤2µA

Response time ≤4 nsec.

Max. discharge current (Imax) 100A (8 / 20 µs)

20kA (8 / 20 µs), 1kA (10 / 350 µs)

Nominal current (IN) ---- 250mA

Internal series resistance ---- 1.5Ω ±10% per line

*1. Measured across the terminal 2 and DIN rail, the terminal 7 and DIN rail.

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SENTRONIC AG

MD7LC

EM-8063 Rev.3 P. 2 / 4

POINTS OF CAUTION

■ENVIRONMENT

•Indoor use.

•When heavy dust or metal particles are present in the

air, install the unit inside proper housing with sufﬁcient

ventilation.

•Do not install the unit where it is subjected to continuous

vibration. Do not subject the unit to physical impact.

•Environmental temperature must be within -25 to +85°C

(-13 to +185°F) with relative humidity within 30 to 90%

RH in order to ensure adequate life span and operation.

•This unit needs a DIN rail as earth grounding bar. Ox-

ide coating of an aluminium rail may lower the electric

conductivity between this module and the ground. Use a

steel or copper rail.

■DIELECTRIC STRENGTH TESTING

•The surge protector starts discharging when a voltage

greater than 15V is applied between lines and earth. Re-

move the grounding wire before conducting a test. Be

sure to return the wire 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 Lightning Surge Protector for Power

Lines for adequate protection.

COMPONENT IDENTIFICATION

Body

Spring Loader

DIN Rail Mounting

Adaptor (for grounding)

Connection

Diagram

(left side)

Model No.

Indication

INSTALLATION

Mount the unit on a DIN rail. Once installed, do not move

it to another DIN rail.

■MOUNTING THE UNIT ON A DIN RAIL

A)Hang the upper hook of the DIN rail mounting adaptor at

the rear side of unit, on the DIN rail.

B)Push in the lower in keeping pressing the unit to the DIN

rail.

C)DIN rails generally have slight individual variability in

size. If you ﬁnd it difﬁcult to push in the lower part, go

back to (A) and hang the upper part more deeply onto the

rail and try (B) again.

DIN Rail

■REMOVING THE UNIT

A)Push down the spring loader utilizing a minus screwdriv-

er.

B)Conﬁrm that it is pulled enough down and pull out the

lower part of the unit.

C)Detach the upper part from the DIN rail.

Spring Loader

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SENTRONIC AG

MD7LC

EM-8063 Rev.3 P. 3 / 4

TERMINAL CONNECTION

Connect the unit as in the diagram below.

Be sure to ground the DIN rail on which the unit is mounted and cross-wire between the rail and FG terminal of the protected

device as shown in Figure 1 in order to equalize the earth potential.

When the unit is connected with a device which has no FG terminal, ground the surge protector only.

■EXTERNAL DIMENSIONS unit: mm (inch)

95 (3.74)

(.28)

98 (3.86) [1.5 (.06)]

8–M3 EURO

TERMINAL

DIN RAIL

(35 mm wide)

DIN RAIL

ADAPTOR

WIRE INSERTION ANGLE: approx. 20°

57 (2.24)

1.9 (.07)

■Figure 1. GROUNDING

M-RESTER PROTECTED

EQUIPMENT

CROSSOVER WIRE

Cross-wire from the DIN rail to the metal housing of the protected device

to equalize the ground potential.

Ground only the surge protector when the protected device has no

grounding terminal.

DIN RAIL ADAPTOR

(for grounding)

DIN RAIL

Grounding

Note: No need of cross wiring for the protected devices connected to the

MD7G.

■CAUTION WHEN WIRING

Hold the module steady at the front when you

tighten/loosen screw terminals.

056 222 38 18 mailbox@sentronic.com www.sentronic.com

SENTRONIC AG

MD7LC

EM-8063 Rev.3 P. 4 / 4

■CONNECTION DIAGRAM

Strain Gauge

Transmitter

(protected device)

Strain Gauge

Shield Wire

EXC.

OUTPUT

M-RESTERsurge

side

surge

side

protected

side

protected

side

MD7G

OUTPUT

POWER

EXC.

INPUT

–

DIN RAIL ADAPTOR

(for grounding)

DIN RAIL

Grounding

DIN RAIL ADAPTOR

(for grounding)

MD7G

DIN RAIL ADAPTOR

(for grounding)

5 2

6 3

4 1

M-RESTER

DIN RAIL ADAPTOR

(for grounding)

2 5

3 6

1 4

*1. Without the MD7G, cross-wire between the DIN rail and the metal housing of the protected device to equalize the earth potential.

*2. Oxide film on the surface of an aluminium rail may lower the electric conductivity between this module and the ground. Use a steel or copper rail.

*3. Be sure to ground the DIN rail. Recommended grounding resistance ≤100Ω.

DIN RAIL

Grounding

*1*1

WIRING INSTRUCTIONS

■EURO TERMINAL

Torque: 0.3 N·m

Applicable wire size: 0.2 – 2.5 mm2

Stripped length: 8 mm

MAINTENANCE

Check surge protectors periodically. Many cases of light-

ning are ignored, and even lightning at a far distance often

causes inductive surges.

We recommend that you check your surge protector 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 DIN rail is connected to the metal

enclosure of protected device.

3) Make sure that the surge protector is securely attached

to the DIN rail, and that the rail is grounded to earth.

■DISCHARGE ELEMENT

1) Remove all wiring connected to the surge protector when

you test the module.

2) Check resistance across the following terminals on the

high resistance range of multimeter (measuring current

≤ 0.25 µA) and conﬁrm no conduction.

Terminals (4) – (5), (6) – (8),

(5) – (DIN rail), (8) – (DIN rail)

The tester should show 1 MΩ or greater for the terminals

(6) – (8), 10 MΩ or greater for other sets of terminals.

When measuring across (4) – (5), connect the tester’s

probe so that the positive voltage is applied to (4).

3) Conﬁrm conduction across the same terminals with a 500

V DC 1000 MΩ insulation tester The tester should show

20 MΩ or less.

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

surge protector.

056 222 38 18 mailbox@sentronic.com www.sentronic.com

SENTRONIC AG

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