5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: info@m-system.co.jp
EM-8232 Rev.5 P. 1 / 3
INSTRUCTION MANUAL
LIGHTNING SURGE PROTECTOR FOR
RS-485 / RS-422
MODEL
MDP-4R
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 the network
• No interruption of transmission signal by unplugging the
head element module
■
SPECIFICATIONS
LINE TO LINE
LINE TO
EARTH
Max. continuous
operating voltage (Uc)
±5V
B – C
5V
B or C – A
±140V
Voltage protection level
(Up) @2kV (1kA)
±20V
2 – 3
20V
2 or 3 – 1
±500V
Leakage current
≤ 0.2mA
@±5V
B – C
≤ 0.2mA
@5V
B or C – A
≤ 10µA
@±140V
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
Approx. 4.5 Ω including return
Max. line voltage
±5V
Input attenuation
-0.5 dB or less @DC...2.0 MHz, Z0 = 110 Ω
POINTS OF CAUTION
■
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 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
Ground Terminal (G)
(used as mounting bracket)
Base
Element is secured to Base
with screw when M-RESTER is
shipped from Factory.
M•RESTER
MADE IN JAPAN N1430B
Lot.NO
MODEL
Head Element
Specifications
