M-system MDP-65T User manual

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8223 Rev.1 P. 1 / 3
INSTRUCTION MANUAL
LIGHTNING SURGE PROTECTOR FOR
PHOTOVOLTAIC SYSTEM, INSTRUMENT SHELTER
MODEL MDP-65T
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 4 – 20mA DC and pulse signal
line including both 4-wire and 2-wire transmitters
• Absorbs surges only without affecting instrumentation
signal
• No interruption of signal by unplugging surge protector
element
■SPECIFICATIONS
LINE TO LINE LINE TO EARTH
Max. continuous oper-
ating voltage (Uc)
70V ±140V
Voltage protection level
(Up) @1kV (100A)
80V ±650V
Voltage protection level
(Up) @2kV (1kA)
110V ±800V
Leakage current ≤ 30µA
@70V DC
≤ 5µA
@±140V DC
Capacitance @1 MHz ≤ 1000 pF ≤ 100 pF
Response time ≤ 4 nsec. ≤ 20 nsec.
Max. discharge current (Imax) 5000A (8 / 20 µs)
Nominal current (IN) 100mA
Internal series resistance 20 Ω ±10% 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.
• Continuous operating voltage must be less than 75V.
■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 -20 to +80°C
(-4 to 176°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 signal lines
but also through power supply lines. We recommend that
you also use the surge protectors for power line for suf-
ficient protection.
COMPONENT IDENTIFICATION
M•RESTER
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.

MDP-65T
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8223 Rev.1 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)
25 (.97) min. 2–M4 SCREW
90 (3.54)
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
• 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.
DIN Rail Mounting Adaptor
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 Te r
minal
• 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-65T
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-8223 Rev.1 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.
M-RESTER
IN
M-RESTER
CURRENT LOOP SUPPLY
(protected device)
2-WIRE TRANSMITTER
(protected device)
CENTRAL
STATION
FIELD
G
FROM
FIELD
TO
CENTRAL
STATION
+
–
P–
P+
S–
S+
P–
P+
S–
S+
CABLE
GG
G
+
–
■ PROTECTING TWO-WIRE SIGNAL LINES ■ PROTECTING ELECTRONIC INSTRUMENTS’ I/O
P+
G
P–
S+
S–
+
–
+
–
U
V
G
Receiver
(protected device)
+
–
+
–
U
V
G
Transmitter
(protected device) M-RESTER
S+
G
S–
P+
P–
M-RESTER Signal
Line
*1
*2*2
*1. Install a circuit protector when the transmitter output current exceeds 100mA.
*2. The M-RESTER is designed in particular to protect signal lines.
To protect power supply lines, install other types of surge protectors.
■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
The M-RESTER Tester is available for checking the ele-
ment module of this surge protector.
If you do not have one, approximate checking can be con-
ducted as following.
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 ≥ 10 MΩ). When measuring
across (S+) – (S–), connect the multimeter so that positive
voltage is applied to (S+) terminal.
Terminals (S+) – (S–), (S+) – (G), (S–) – (G)
3) Check that discharging occurs across the same terminals
with a 500V DC 1000 MΩ insulation tester (The tester
shows ≤ 20 MΩ).
If any of the above tests shows negative, replace the protec-
tor.