M-system MDK-LC Instruction Manual

INSTRUCTION MANUAL
LIGHTNING SURGE PROTECTOR FOR STRAIN GAUGE USE
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 strain gauge transmitters
from lightning surge damage that enters on the wiring
between the strain gauge and the transmitter
• Absorbs surges only without affecting transmitted sig-
nals.
■ SPECIFICATIONS
OUTPUT SIDE EXC. SIDE
Discharge voltage ±0.3V min.
Max. surge voltage* ±15V max.
Response time
Discharge current 100A
capacity (8/20 µsec.)
Leakage current ≤0.2µA
@±0.3V DC
Maximum voltage ±0.3V
Int. series resist.
*The maximum voltage that could pass through M-RESTER.
Protected equipment must be able to withstand this voltage
for a very short time period.
LINE TO GND
15V min. ±15V min.
30V max. ±30V max.
≤5 nsec.
50A 50A
(8/20 µsec.) (8/20 µsec.)
≤0.2µA ≤0.2µA
@15V DC @±15V DC
15V –––
≤0.1Ω
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
MODEL
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 – 90% RH
in order to ensure adequate life span and operation.
■ DIELECTRIC STRENGTH TEST
• The unit will start discharging when 15V or greater volt-
age is applied bewteen lines and ground. DO NOT per-
form dielectric strength tests with wires connected to the
unit.
■ 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
Specification
Label
Connection
Diagram Label
MDK-LC
EM-8136 Rev.4 P. 1 / 3