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.
■
INSTALLATION / INSTRUCTION MANUAL
This manual describes necessary points of caution when
you use this product, including installation, and basic main-
tenance procedure.
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
• Specifically designed to protect 4 to 20mA DC signal line
including both 4-wire and 2-wire transmitters from dam-
age caused by lightning surges
• Absorbs surges only without affecting transmitted sig-
nals.
■
SPECIFICATIONS
BETWEEN LINES
LINE TO
GND
MGD-24
MGD-65
Discharge voltage
30V min.
70V min.
±500V max.
Max. surge voltage*
40V max.
80V max. ±650V max.
Leakage current
≤5μA
@30V DC
≤
5μA
@70V DC
≤
5μA
@±140V DC
Max. line voltage
30V DC
70V DC
–––
Response time
≤
0.1 μsec.
Discharge current
1000A (8 / 20 μsec.)
Max. load current
100mA
Internal series resist.
approx. 20Ω including return
POINTS OF CAUTION
■
ENVIRONMENT
• When heavy dust or metal particles are present in the at-
mosphere, install M-RESTER inside proper housing and
ventilate it.
• Do not install the M-RESTER where it is subjected to
continuous vibration. Do not apply physical impact to the
M-RESTER.
• 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 unit. Otherwise the element will start dis-
charging at discharge voltage, which can cause insulation
failure. Be sure to return the wires after the test.
■
AND ....
• We recommend that you keep spare M-RESTERs 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 Lightning Arrester for Power Lines for
sufficient protection.
COMPONENT IDENTIFICATION
Body
Terminal Cover
Specification Label
LIGHTNING SURGE PROTECTOR FOR
STANDARD SIGNAL LINE & PULSE USE
MODEL
MGD-24/MGD-65
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-8211 Rev.4 P. 1 / 4
INSTRUCTION MANUAL
