M-system MD74R Instruction Manual

INSTRUCTION MANUAL
LIGHTNING SURGE PROTECTOR FOR
RS-485 / RS-422
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.
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.
Table 1. Specifications
Max. continuous operating voltage (Uc)
Voltage protection level (Up)
@4kV (1.2 / 50 µs)
Leakage current @Uc
Response time
Approx. capacitance @ 100 kHz
Max. discharge current (Imax)
Nominal current (I )
N
Internal series resistance
Input attenuation
*1. Values for the MD74R-FF. Shortcircuited for the MD74R-FG.
SEN TRONIC
(ultra-slim)
GENERAL
■ 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
■ SPECIFICATIONS
See Table 1.
LINE TO LINE LINE TO SG
±5V 5V
±25V 25V
≤ 200µA ≤ 200µA
≤ 4 nsec. ≤ 4 nsec.
300 pF 300 pF
20kA (8 / 20 µs), 1.0kA (10 / 350 µs)
-0.5 dB max. @DC...2.0 MHz, Z0 = 110Ω
056 222 38 18 mailbox@sentronic.com
AG
MODEL
LINE/SG TO EARTH
±160V
±800V
≤ 10µA
≤ 20 nsec.
100 pF
100mA
2Ω ±10% per line
www.sentronic.com
MD74R
SHLD TO EARTH
±160V *
1
±800V *
1
≤ 10µA*
1
≤ 20 nsec.*
1
100 pF
EM-8058 Rev.6 P. 1 / 4