EM-8063 Rev.3 P. 1 / 4
INSTRUCTION MANUAL
LIGHTNING SURGE PROTECTOR FOR
STRAIN GAUGE
(ultra-slim)
MODEL
MD7LC
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)
■
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.
When using this product in potentially explosive atmos-
phere or hazardous (classified) location, you have to follow
the safety procedure to install it. Please refer to “SAFE IN-
STALLATION MANUAL” for each type of certification.
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
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FUNCTION & FEATURES
•
High discharge current capacity 20 kA (8 / 20 µs), 1 kA
(10 / 350 µs)
•
Ultra-thin 7-mm-wide module can be mounted in high
density
•
Excellent protection employing multi-stage SPD circuits
•
DIN rail mounting and grounding
•
Shield terminal provided
•
Protects strain gauges and transmitters
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SPECIFICATIONS
See Table 1.
Table 1. Specifications
MODEL NO.
MD7LC-0
MD7LC-1
Max. continuous operating voltage (Uc)
Output voltage
±0.2V
Excitation
15V
Line to Earth*
1
±15V
Voltage protection level (Up)
Output voltage
±15V @0.2kV (1.2 / 50 µs)
±40V @6kV (1.2 / 50 µs)
Excitation
30V @0.2kV (1.2 / 50 µs)
50V @6kV (1.2 / 50 µs)
Line to Earth*
1
±30V @0.2kV (1.2 / 50 µs)
±50V @6kV (1.2 / 50 µs)
Leakage current @Uc
Output voltage
≤0.2µA
Excitation
≤2µA
Line to Earth*
1
≤2µA
Response time
≤4 nsec.
Max. discharge current (Imax)
100A (8 / 20 µs)
20kA (8 / 20 µs), 1kA (10 / 350 µs)
Nominal current (I
N
)
----
250mA
Internal series resistance
----
1.5Ω ±10% per line
*1. Measured across the terminal 2 and DIN rail, the terminal 7 and DIN rail.
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