Wintriss SmartPAC 2, User Manual

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SmartPAC 2 with WPC 2000 Integration User Manual 1128600
Installation 2-69
12.
To reduce electrical noise and to extend the life of the relays, do the following:
a.
AC loads
: Install arc suppressors across each inductive load (motors, coils, etc.) that is
connected to a cam relay (see Figure 2-34). Suppressors are supplied with each relay.
Install the suppressors across the load or as close to the load as possible. Attach
suppressors by connecting leads across existing terminals or junction points.
b.
DC loads
: Install a diode across each DC load, such as relays, solenoids and PLC
inputs (see Figure 2-35).
Figure 2-34. Installing Suppressors Across an AC Load
Figure 2-35. Installing a Diode Across a DC Load
RIGHT
WRONG
ACCEPTABLE
not recommended
c n/o
Power
in
Power
Return
Suppressor
Relay
c n/o
Power
in
Suppressor
Power
Return
Power
Return
Relay
c n/o
Power
in
Suppressor
Power
Return
Relay
+ DC IN –
DC RETURN
Relay
C N/O
IN4001 or equivalent