Figure
22
-
DC Output (Open
Collector),
output
2
Option "C"
Wiring
Diagram.
Figure 23
-
6 Amp Mechanical
Relay,
Output 2,
Option
"D"
Wiring Diagram.
Output 2 Option
“C",
DC Output (Open Collector)
Model#
98_A-
C 0-0000
__
-
.
.
.
.
.
.
.
’
9
-
8 Heat, Cool
+
#
or Alarm
Switched DC
Watlow’s
solid state switch is a low
current
DC output (open collector) used to switch an
external
power
switching device such as a
SSR
or an electromechanical relay. The input
specifications of the power switching device must match those listed for the SS switch
output. The power switching device must provide isolation between the SS switch
output and load power since the SS switch output is a non-isolated output. Minimum
load resistance is
5 0 0 o h m s.
Available current is
9mA
minimum and
22mA
maximum.
Output 2 Option
“D”,
6
Amp
Mechanical Relay
Model#
98_A-
D 0 -
0000--Mechanical
Relay
Mechanical
Relay
The electromechanical relay is an electrical and mechanical device with moving parts.
When power is
applied
to the relay solenoid, contact closure is created through move-
ment of the “common” contact of the relay. Off state impedance is 20K ohms minimum.
20
WATLOW
Series
980/985
User’s
Manual
InstaIl
and Wire, Chapter 2