EM-8283-A Rev.3
P. 1 / 6
MD6x-24
MD6x-65
BEFORE USE ....
Thank you for choosing M-System. Before use, check the
contents of the package you received as outlined below.
If you have any problems or questions on the product, please
contact M-System’s Sales Office or representatives.
■
PACKAGE INCLUDES:
Lightning surge protector .......................................... (1)
■
MODEL NO.
Check that model No. described on the specification label is
exactly what you ordered.
■
INSTALLATION / INSTRUCTION MANUAL
This manual describes necessary points of caution when you
use this product, including installation and basic mainte-
nance procedure.
When using this product in potentially explosive atmosphere
or hazardous (classified) location, you have to follow the
safety procedure to install it. Please refer to “SAFE INSTAL-
LATION MANUAL” for each type of certification.
LIMITATION APPLICABLE TO M-RESTER
The M-Rester will protect electronics equipment from dam-
age 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.
INSTRUCTION MANUAL
MODEL
LIGHTNING SURGE PROTECTOR FOR STANDARD
SIGNAL LINE & PULSE USE
(conduit mount, weather-proof)
MD6x-24
MD6x-65
GENERAL
■
FUNCTION & FEATURES
• Designed specifically to protect 4 to 20mA DC and pulse
signal line including both 4-wire and 2-wire transmitters
• Direct mount in a wiring conduit of outdoor enclosures
• Absorbs surges only without affecting transmitted signals
■
SPECIFICATIONS
BETWEEN LINES
LINE TO GND
MD6x-24
MD6x-65
Discharge voltage 30V min.
70V min.
±
160V min.
(peak voltage)
Max. surge voltage* 40V max.
100V max.
±
650V max.
Leakage current
≤
5
µ
A
≤
5
µ
A
≤
5
µ
A
@30V DC
@70V DC
@
±
160V DC
Max. line voltage
30V DC
70V DC
–––
Response time
≤
4 nsec.
≤
4 nsec.
≤
20 nsec.
Capacitance
≤
2500 pF
≤
2500 pF
≤
100 pF
@1kHz
@1kHz
@1kHz
Discharge current
10000A (8 / 20
µ
sec.)
Max. load current
100mA
Internal series resist.
approx. 22
Ω
including return
*The maximum voltage that could pass through M-RESTER.
Protected equipment must be able to withstand this voltage
for a very short time period.
POINTS OF CAUTION
■
GENERAL PRECAUTION
• Before you remove the unit or mount it, turn off the signal
input and the power supply to the connected devices for
safety.
■
ENVIRONMENT
• 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 -40 to +85
°
C
(-40 to +185
°
F) in order to ensure adequate life span and
operation.
■
INSULATION RESISTANCE TEST
• Before conducting an insulation test, remove the unit from
the protected signal line. Use a megger of 125V DC at the
maximum. If you use a higher-rated megger, the discharge
elements will start discharging, which will be detected falsely
as insulation failure.
■
AND ....
• We recommend that you keep spare M-RESTERs so that
you can replace them when necessary.
