M-system MDP-D Series User manual

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8203 Rev.2 P. 1 / 3
INSTRUCTION MANUAL
LIGHTNING SURGE PROTECTOR
FOR DC POWER SUPPLY USE MODEL MDP-D
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)
DIN rail mounting adaptor*...............................................(1)
Screws for DIN rail mounting (M4 × 8)* ...........................(2)
*Included with option code /A33
■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
• Designed specifically for 12V/24V DC power supplies of
small capacity
• Absorbs surges only without affecting instrumentation
signal
• Monitor LED
■SPECIFICATIONS
LINE TO LINE LINE TO
EARTH
MDP-D12 MDP-D24
Max. continuous
operating voltage (Uc)
14V 27V ±160V
Voltage protection level (Up) 20V 40V ±650V
Leakage current ≤ 3mA
@14V DC
≤ 6mA
@27V DC
≤ 0.1mA
@±160V DC
Response time ≤ 4 nsec. ≤ 4 nsec. ≤ 20 nsec.
Max. line voltage 14V 27V ----
Max. discharge current (Imax) 5000A (8 / 20 µs)
Nominal current (IN) 1A
Internal series resistance ≤ 0.6Ω including return
POINTS OF CAUTION
■CONFORMITY WITH EU DIRECTIVES
• The actual installation environments such as panel con-
figurations, connected devices, connected wires, may af-
fect the protection level of this unit when it is integrated
in a panel system. The user may have to review the CE
requirements in regard to the whole system and employ
additional protective measures to ensure the CE conform-
ity.
■ENVIRONMENT
• 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 90% RH
in order to ensure adequate life span and operation.
■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.
■AND ....
• We recommend that you keep spare surge protectors so
that you can replace them when necessary.
• Lightning surge can enter not only through power supply
lines but also through signal lines. We recommend that
you also use the surge protectors for signal line for suffi-
cient protection.
COMPONENT IDENTIFICATION
Ground Terminal (G)
(used as mounting bracket)
Head Element Base
Specifications
Monitor LED
Head Element is secured to Base
with screw when the surge protector
is shipped from Factory.
MODEL

MDP-D
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8203 Rev.2 P. 2 / 3
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)
33 (1.30) min. 2–M4 SCREW
90 (3.54)
G
S+
G P+
S–
P–
31.5 (1.24)
2–5 dia.
MTG HOLE
MONITOR LED
6–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
80 (3.15) 90 (3.54)
100 (3.94)
• MOUNTING REQUIREMENTS
unit: mm (inch)
■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.
M•RESTER
2. DIN RAIL MOUNTING
Set the base socket so that its mounting slider is at the bot-
tom. 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 togeth-
er with the screw.
M•RESTER
Solderless Terminal
• MOUNTING REQUIREMENTS unit: mm (inch)
8.5
(.33)
[3.3 (.13)]
DIN RAIL
35mm wide
80 (3.15)
45 (1.77)
4
(.18)
2–M4 MOUNTING SCREW
(used as ground terminal (G))

MDP-D
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8203 Rev.2 P. 3 / 3
TERMINAL CONNECTION
Connect the unit as in the diagram below.
Be sure to cross-wire between the Ground terminal (G) and that of the protected equipment. When the surge protector is con-
nected with a device which has no ground terminal such like M-System’s (See figure below), ground the M-RESTER Ground
terminal (G) only.
P+
G
P–
S+
S–
POWER
+
–
G
Electronic Device
(protected device)
+
–
G
DC Power Source
(protected device) MDP-D
S+
G
S–
P+
P–
MDP-D*1*1
*2
*3
The MDP-D is not applicable to protect two-wire transmitters. To protect two-wire transmitters.
model MDP-24-1 designed to yield only small leakage current is suitable.
*1. Confirm the polarity of the terminals when connecting this module to a protected device.
*2. Use a DC power source with the overload current protection function. (maximum output current 1A)
*3. Install a current limiting element (capacity 1A) when the output current exceeds 1A.
Grounding Grounding
■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.
When the M-RESTER is mounted with DIN Rail Mounting Adapter,
connect the grounding wire to the mounting screw of the M-RESTER.
WIRING INSTRUCTIONS
■SCREW TERMINAL
Torque: 0.8 N·m
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 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 FUNCTION
Confirm that the front monitor LED is turned on while the
power is supplied. If the LED is off despite the power sup-
plied, replace the surge protector to a new one.
The M-RESTER Tester is available for a preliminary check-
ing of the surge protector’s head element.
Approximate testing procedure without using the Tester is
explained as below.
1) Remove all wiring connected to the surge protector when
you test the element module.
2) Check resistance across the following terminals on the
high resistance range of multimeter and confirm no con-
duction. The meter shows the same value as it will show
when these terminals are open.
Terminals (S+) – (G), (S–) – (G)
3) Check that discharging occurs across the following ter-
minals with a 500V DC 1000MΩ insulation tester. (The
tester shows ≤20MΩ.)
Terminals (S+) – (G), (S–) – (G), (S+) – (S–)
4) With no load connected, insert a DC power source across
(S+) and (S–) terminals and measure current at (S+).
The meter shows 3mA or less (MDP-D12) or 6mA or less
(MDP-D24).
If any of the above tests shows negative, replace the pro-
tector.