M-system MD-LC2 Service manual

EM-8228 Rev.3 P. 1 / 3
MD-LC2
BEFORE USE ....
Thank you for choosing M-System. Before use, check the
contents of the package you received as outlined below.
If you have any problems or questions on the product, please
contact M-System's Sales Office or representatives.
n PACKAGE INCLUDES:
Lightning surge protector ........................................... (1)
n MODEL NO.
Check that model No. described on specification label is
exactly what you ordered.
n INSTALLATION / INSTRUCTION MANUAL
This manual describes necessary points of caution when
you use this product, installation, and basic maintenance
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 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.
POINTS OF CAUTION
n ENVIRONMENT
• When heavy dust or metal particles are present in the
atmosphere, 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
(23 to 131°F) and relative humidity within 30 – 90% RH in
order to ensure adequate life span and operation.
n DIELECTRIC STRENGTH TEST
• The unit will start discharging when 15V or greater voltage
is applied bewteen lines and ground. Remote the unit from
the base socket when performing dielectric strength tests.
n AND ....
• We recommend that you keep spare M-RESTERs 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 sufficient protection.
COMPONENT IDENTIFICATION
SPECIFICATIONS
LIGHTNING SURGE PROTECTOR FOR STRAIN GAUGE USE
(6-wire remote sensing) MODEL MD-LC2
INSTALLATION / INSTRUCTION MANUAL
Body Base Socket
Specification
Label
SIG (L1 to L2) EXC (+ to –) EXC (S+ to S–) SIG (L1, L2) to GND EXC (S+, +) to G EXC (S–, –) to G
Discharge voltage ±0.3V min. 15V min. 15V min. ±15V min. +30/-15V min. ±15V min.
Max. surge voltage* ±20V max. 40V max. 40V max. ±40V max. +65/-40V max. ±40V max.
Leakage current ≤0.2µA
@±0.3V DC
≤2µA
@15V DC
≤2µA
@±15V DC
≤2µA
@±15V DC
Max. line voltage ±0.3V 15V 15V ±15V +30/-15V ±15V
Response time 4 nanosec.
Discharge current 5000A
(8/20 µsec.)
capacity
Int. series resist. approx. ≤10Ω approx. ≤4Ω approx. ≤10Ω —
(each line)
Max. load current 100mA 200mA 100mA —
(each line)
*The maximum voltage that could pass through M-RESTER. Protected equipment must be able to withstand this voltage for a very short time period.

EM-8228 Rev.3 P. 2 / 3
MD-LC2
INSTALLATION
Detach the yellow clamps located at the top and bottom of the
unit for separating the body from the base socket.
nDIN 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.
nWALL MOUNTING
Refer to the drawing in the
next page.
TERMINAL CONNECTIONS
Connect the unit as in the diagram below.
Be sure to connect the shield wire to the Shield terminal (3 and 8) and ground the terminal 8 of the MD-LC2.
n GROUNDING
A cross-over wire between M-RESTER and ground or metallic
housing of equipment is required for protection. When the
protected equipment has no ground terminal, ground only
the M-RESTER.
M-RESTER
2
11
4
12
M-RESTER
5
4
12
2
11
15
14 14
15
(PROTECTED EQUIPMENT)
9
1
10
8
7
3
6
7
9
Remote Sensing
Strain Gauge Transmitter LC2/LCS2
SHIELD
1
2
OUTPUT
8
7
POWER
EXC
INPUT
1 5
6
10
8 3
EXC +
EXC –
(+)
(–)
OUTPUT
Strain Gauge
(PROTECTED EQUIPMENT)
SHLD
4
5
10
11
6
9
3
S+
S–
–
GSHLD
+
–
U(+)
V(–)
+
L1
L2
metal housing
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.
M-RESTER PROTECTED
EQUIPMENT
G
G
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.

EM-8228 Rev.3 P. 3 / 3
MD-LC2
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:
n CHECKING
WIRING
• Make sure that wiring is done as instructed in the con-
nection diagram.
• Make sure that only the ground terminal (No. 8) of the
central MD-LC2 is grounded.
DISCHARGE ELEMENTS
Remove all wiring connected to M-RESTER when you test
the discharge elements.
• Check resistance across the following terminals on the
high resistance range of multimeter (infinite standard).
When measuring across (2) – (9) and (11) – (15), connect
the multimeter so that positive voltage is applied to (2) and
(11) terminal.
Terminals (2) – (9), (11) – (15), (2) – (8), (9) – (8),
(11) –(8), (15) – (8), (1) – (8), (10) – (8)
EXTERNAL DIMENSIONS mm (inch)
• Check resistance across the terminal (1) – (10) on the
high resistance range of multimeter of 0.3V or less (innite
standard).
• Check that discharging occurs across the same terminals
with a 500V DC insulation tester. (Indicator of the tester
reaches over-scale.)
• If any of the above tests shows negative, replace the M-
RESTER.
M-SYSTEM WARRANTY
M-System warrants such new M-System product which it manufactures to be free from defects in materials and workmanship during the 36-month period following the date that such
product was originally purchased if such product has been used under normal operating conditions and properly maintained, M-System’s sole liability, and purchaser’s exclusive
remedies, under this warranty are, at M-System’s option, the repair, replacement or refund of the purchase price of any M-System product which is defective under the terms of this
warranty. To submit a claim under this warranty, the purchaser must return, at its expense, the defective M-System product to the below address together with a copy of its original
sales invoice.
THIS IS THE ONLY WARRANTY APPLICABLE TO M-SYSTEM PRODUCT AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. M-SYSTEM SHALL HAVE NO LIABILITY FOR CONSEQUENTIAL, INCIDENTAL OR
SPECIAL DAMAGES OF ANY KIND WHATSOEVER.
M-System Co., Ltd., 5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN, Phone: [phone], Fax: [phone], E-mail: [e-mail]
80 (3.15)
50 (1.97)
72 (2.83) [3.3 (.13)]
80 (3.15)
20
(.79)
35.4 (1.39)
60 (2.36)
72 (2.83)
7.8 (.31)
CLAMP
(top & bottom)
DIN RAIL
35mm wide
2–4.5 (.18) dia.
MTG HOLE
25 (.98) deep
14–M3.5
SCREW
• When mounting, no extra space is needed between units.
12 56 14
11 1 1015
4
3
2
7
9
8
103 (4.06)
132 (5.20)