Watlow CLS200 - Manual (Page 53)

CLS200 Series User’s Guide Chapter 2: Installation
Doc.# 0600-3050-2000 Watlow Anafaze 37
Configuring Outputs
Keep in mind the following points as you choose outputs for
control and alarms:
• You can enable or disable the control outputs. The de-
fault setting is heat outputs enabled, cool outputs dis-
abled.
• You can program each control output individually for
on/off, time proportioning, distributed zero crossing, or
Serial DAC control.
• You can individually program each control output for
direct or reverse action.
• Alarm outputs other than the global alarm are non-
latching.
• Alarms can be suppressed during process start up and
for preprogrammed durations. See Alarm Delay on
page 103.
• Alarm outputs can be configured as a group as normal-
ly on (low) or normally off (high). See Digital Output
Polarity on Alarm on page 81.
Control and Alarm Output Connections
Typically control and alarm outputs use external optically
isolated solid state relays (SSRs). SSRs accept a 3 to 32V
Î
(dc) input for control, and some can switch up to 100 Amps
at 480 V
Å (ac). For larger currents, use silicon control rec-
tifier (SCR) power controllers up to 1000 Amps at 120 to
600V
Å (ac). You can also use SCRs and a Serial DAC for
phase-angle fired control.
The 34 control and alarm outputs are open collector out-
puts referenced to the CLS200’s common. Each output
sinks up to 60 mA
Î (dc) to the controller common when on.
NOTE! Control outputs are SINK outputs. They are
Low when the output is ON. Connect them to
the negative side of solid state relays.
Figure 2.23 shows sample heat, cool and alarm output con-
nections.
Figure 2.23 Sample Heat, Cool and Alarm
Output Connections
Cool Output
Alarm Output
+5V Î (dc)
+ - + - + -
SSR SSR SSR
TB50 or TB18
Heat Output