Red Lion CSRTD6 - Manual (Page 3)

3 3
a. Using a snubber, which is a resistor-capacitor (RC) network or metal oxide
varistor (MOV) across an AC inductive load is very effective at reducing
EMI and increasing relay contact life.
b. If a DC inductive load (such as a DC relay coil) is controlled by a transistor
switch, care must be taken not to exceed the breakdown voltage of the
transistor when the load is switched. One of the most effective ways is to
place a diode across the inductive load. Most RLC products with solid state
outputs have internal zener diode protection. However external diode
protection at the load is always a good design practice to limit EMI.
Although the use of a snubber or varistor could be used.
RLC part numbers: Snubber SNUB0000
Varistor ILS11500 or ILS23000
Note: Reference manufacturer’s instructions when installing any EMI
suppression device.
7. Also care should be taken when connecting input and output devices to the
instrument. When a separate input and output common is provided, they
should not be mixed. Therefore a sensor common should NOT be connected
to an output common. This would cause EMI on the sensitive input common,
which could effect the instrument’s operation.
Visit RLC’s web site at www.redlion.net for more information on EMI
guidelines, Safety and CE issues as they relate to Red Lion Controls products.
PORT 3
ETHERNET
B
ISOLATED
A
POWER
SUPPLY +
-
24VDC
CSMSTR - MASTER CSTC8ISO
PORT 2
A
COMMUNICATIONS
A
PORT 1
PROGRAMMING ISOLATED
POWER
SUPPLY
INPUT 8
ISOLATED INPUT 7
ISOLATED INPUT 6
ISOLATED INPUT 5
ISOLATED INPUT 4
ISOLATED INPUT 3
ISOLATED INPUT 2
ISOLATED INPUT 1
BLOCK DIAGRAM
HARDWARE INSTALLATION
MODULE
1
BASE
2
ATTACH THE MODULE BASE
TO THE DIN RAIL
MODULE BASE
5
4
3
ATTACH MODULE TO BASE SEPARATE BASE
FROM MODULE