M-system MDR2 User manual

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
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: [phone] Fax: [phone] E-mail: [e-mail]
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
1
2
3
4
5
6
7
8
SURGE
SIDE
S1
S2
S3
S4
S5
S6
S7
S8
COM
G
P1
P2
P3
P4
P5
P6
P7
P8
COM
G
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
1
2
3
4
5
6
7
8
SURGE
SIDE
S1
S2
S3
S4
S5
S6
S7
S8
COM
G
P1
P2
P3
P4
P5
P6
P7
P8
COM
G
*
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: [phone] Fax: [phone] E-mail: [e-mail]
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
D
EQUIPMENTM-RESTER
P1
P2
P8
G
COM
RELAY
METAL
HOUSING
FIELD
S1
S2
S8
COM
S1
S2
S8
G G
COM
P1
P2
P8
COM
■GROUNDING
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.
■WIRING
PROTECT
SIDE
MONITOR
1
2
3
4
SURGE
SIDE
S1
S2
S3
S4
S5
P1
P2
P3
P4
P5
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.