MDP-PM
P. 1 / 3
EM-8115 Rev.7
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
LIGHTNING SURGE PROTECTOR FOR
POTENTIOMETER USE
MODEL
MDP-PM
INSTRUCTION MANUAL
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 that the model number described on the product is
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 certain
extremely high voltages caused by a direct or almost di-
rect hit by lightning.
M-Rester must be installed according to this installation
/ instruction manual.
CAUTION (DISCHARGE CAPACITY)
The discharge capacity
of this unit has been in-
creased to 5000 Amps.
However, using an older
style base socket with
any upgraded head ele-
ment could decrease the
overall effectiveness of
the unit.
The upgraded version
element and socket are
distinguished by blue labels affixed to them. If you are re-
placing the head element only, be sure to check the label
color of the base socket that is already installed.
GENERAL
■
FUNCTION & FEATURES
• Designed specifically for potentiometer or slidewire cir
-
cuits
• Protects potentiometer transmitters from lightning surge
damage that enters on the wiring between the potentiom-
eter and the transmitter
• Absorbs surges only without affecting instrumentation
signal
•
No interruption of signal by unplugging the protector element
■
SPECIFICATIONS
POINTS OF CAUTION
■
ENVIRONMENT
• When heavy dust or metal particles are present in the air,
install the surge protector inside proper housing with suf-
ficient 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.
M•RESTER
New Element Label
Blue: 5000A
(Black: 2000A)
New Base Label
Blue: 5000A
(White: 2000A)
LINE TO LINE
LINE TO
EARTH
Max. continuous
±7.5V
7.5V
±140V
operating voltage (Uc)
B – C
B or C – A
Voltage protection level ±16V max 16V max ±650V max
(Up) @1kV (100A)
2 – 3
2 or 3 – 1
Voltage protection level ±25V max 25V max ±800V max
(Up) @2kV (1kA)
2 – 3
2 or 3 – 1
Leakage current
≤10µA
≤10µA
≤10µA
@±7.5V DC @7.5V DC @±140V DC
B – C
B or C – A
Capacitance @1 MHz
≤2000 pF
≤100 pF
Response time
≤0.1 microsecond
Max. discharge current
5000A (8 / 20 µs)
(Imax)
Nominal current (I
N
) 100mA
Internal series resistance
10Ω ±0.1%, 30 ppm/°C (17 ppm/°F)
