Watlow CLS200 - Manual (Page 51)

CLS200 Series User’s Guide Chapter 2: Installation
Doc.# 0600-3050-2000 Watlow Anafaze 35
Wiring Control and Digital I/O
This section describes how to wire and configure the control
outputs for the CLS200 series controller.
NOTE! Control outputs are connected to the
CLS200’s common when the control output
is on (low). Be careful when you connect ex-
ternal devices that may have a low side at a
voltage other than controller ground, since
you may create ground loops.
If you expect grounding problems, use isolat-
ed solid state relays and isolate the control
device inputs.
The CLS200 provides dual PID control outputs for each
loop. These outputs can be enabled or disabled, and are
connected via TB50 or TB18.
Output Wiring Recommendations
When wiring output devices, use multicolored, stranded,
shielded cable for analog outputs and digital outputs con-
nected to panel-mounted solid state relays.
• Analog outputs usually use a twisted pair.
• Digital outputs usually have 9 to 20 conductors, de-
pending on wiring technique.
Cable Tie Wraps
Once you have wired outputs to the TB50, install the cable
tie wraps to reduce strain on the connectors.
Each row of terminals has a cable tie wrap hole at one end.
Thread the cable tie wrap through the cable tie wrap hole.
Then wrap the cable tie wrap around the wires attached to
that terminal block.
Digital Outputs
The CLS200 series provides dual control outputs for up to
16 loops. The controller’s default configuration has all heat
outputs enabled and all cool outputs disabled. Disabling a
heat output makes that output available to be used as a
control or an alarm output. See Enable or Disable Heat or
Cool Outputs on page 94. The CPU watchdog timer output
can be used to monitor the state of the controller with an
external circuit or device. See CPU Watchdog Timer on
page 38.