Red Lion ProducTVity Station - Manual (Page 4)

4
COMMUNICATION PORTS
COMM
USB/PG
+24V
COMMON
+24 V
CHASSIS GND
WIRING
POWER CONNECTION
PROGRAMMING PORTS
RS232
RTS
COMM
Tx
COMM
CTS
Rx
YELLOW LED
GREEN/AMBER LED
CBLPROG0
CBLUSB00
OR
Ethernet (Crossover)
OR
STS
CF
ET HERN
ET
RS485
RS232
USB HOST
RS232/PG
DV I
Tx
RS232
RTS
COMM
COMM
CTS
Rx
CBLxxxxx* CHASSIS GND
OR
CBLPROG0
REM
SLC 5/03 CPU
RUN BATT FLT RUN
RS232 DH485 FORCE
PROG
VDC PWR OUT +24
PWR OUT COM
VAC NEUT 120/240 VAC
USER POWER
POWER
STS
CF
ET HERN
ET
RS485
RS232
USB HOST
RS232/PG
DV I
RS232/PG
USB/PG
ETHERNET
RS232/PG
6. To protect relay contacts that control inductive loads and to minimize radiated
and conducted noise (EMI), some type of contact protection network is
normally installed across the load, the contacts or both. The most effective
location is across the load.
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
7. 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 affect the instrument’s operation.
Visit RLC’s web site at http://www.redlion.net/Support/InstallationConsiderations.
html for more information on EMI guidelines, Safety and CE issues as they
relate to Red Lion Controls products.