lightning surge protector for rs-485 / rs-422 before use - M

lightning surge protector for rs-485 / rs-422 before use - M
MDP-4R
INSTRUCTION MANUAL
LIGHTNING SURGE PROTECTOR FOR
RS-485 / RS-422
MODEL
MDP-4R
BEFORE USE ....
POINTS OF CAUTION
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.
■ 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.
■ MODEL NO.
Confirm that the model number described on the product is
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 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.
GENERAL
■ FUNCTION & FEATURES
•Designed specifically for RS-485 or RS-422 transmission
line
•No interruption of signal by unplugging the protector element
■ 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 sufficient protection.
COMPONENT IDENTIFICATION
Base
Head Element
Specifications
Lot.NO
■ SPECIFICATIONS
5V min
B or C – A
±140V min
Voltage protection level
(Up) @2kV (1kA)
±20V max
2–3
20V max
2 or 3 – 1
±500V max
≤0.2mA
@±5V
B–C
≤0.2mA
@5V
B or C – A
≤10µA
@±140V
Leakage current
Capacitance @1 MHz
≤1000 pF
≤100 pF
Response time
≤4 nsec.
≤20 nsec.
Max. discharge current
(Imax)
M•RESTER
LINE TO EARTH
±5V min
B–C
MODEL
LINE TO LINE
Max. continuous
operating voltage (Uc)
MADE IN JAPAN N1430B
■ PACKAGE INCLUDES:
Surge protector.............................................................. (1)
Element is secured to Base
with screw when M-RESTER is
shipped from Factory.
Ground Terminal (G)
(used as mounting bracket)
5000A (8 / 20 µs)
Nominal current (IN)
100mA
Internal series resistance
Approx. 4.5Ω including return
Max. line voltage
±5V
Input attenuation
-0.5 dB or less @DC...2.0 MHz, Z0 = 110Ω
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-8232 Rev.4
P. 1 / 3
MDP-4R
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)
31.5 (1.24)
80 (3.15)
2–5 (.20) dia.
MTG HOLE
53 (2.09)
27 (1.06)
HEAD ELEMENT
3
2
1
45 (1.77)
80 (3.15)
90 (3.54)
100 (3.94)
BASE
6–M4 TERMINAL SCREW
C
B
A
GROUND TERMINAL (G)
(used as mounting bracket)
■ MOUNTING REQUIREMENTS unit: mm (inch)
2–M4 SCREW
90 (3.54)
33 (1.30) MIN.
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-8232 Rev.4
P. 2 / 3
MDP-4R
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
connected with a device which has no ground terminal such like M-System’s (See figure below), ground the M-Rester Ground
terminal (G) only.
■ Example: Protected devices have no SG terminals
Protected Device
MDP-4R
MDP-4R
Protected Device
LINE +
3
C
C
3
+ LINE
LINE –
2
B
B
2
– LINE
SG
*4
*2
G
A
1
G
*1
1
A
G
G
*3
Grounding
≤100Ω
*4
Grounding
≤100Ω
*1. Leave Terminal A when the shielded twisted-pair cable is not provided.
*2. Leave Terminal 1 when the protected device has no SG (Signal Ground) terminal.
*3. Cross wire to the surge protector’s G terminal when grounding the shield wire.
*4. Cross-over wire between G terminals of the surge protector and the protected device is required.
Ground only the surge protector if the protected device has no G terminal.
■ Example: Each SG terminal is connected with triplex cable
Protected Device
MDP-4R
MDP-4R
Protected Device
LINE +
3
C
C
3
+ LINE
LINE −
2
B
B
2
− LINE
SG
*3
G
A
1
G
A
1
G
*1
SG
G
*2
Grounding
≤100Ω
*3
Grounding
≤100Ω
*1. Provide electrical insulation with insulating tape and the like so that the live part is not exposed,
as over voltage may generate on the shield wire.
*2. Cross wire to the surge protector’s G terminal when grounding the shield wire.
*3. Cross-over wire between G terminals of the surge protector and the protected device is required.
Ground only the surge protector if the protected device has no G terminal.
■ GROUNDING
MAINTENANCE
M-RESTER
G
GROUNDING
(100 ohms or less)
PROTECTED
EQUIPMENT
G
CROSSOVER WIRE
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.
Check surge protectors periodically. Many cases of lightning 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 connection 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 a preliminary checking
of the surge protector’s head element.
If any of the above tests shows negative, replace the protector.
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-8232 Rev.4
P. 3 / 3
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