Watlow CLS200 - Manual (Page 45)

CLS200 Series User’s Guide Chapter 2: Installation
Doc.# 0600-3050-2000 Watlow Anafaze 29
Digital Input Test
Use the following procedure to test digital inputs before
connecting to field devices:
1. Disconnect any system wiring from the input to be
tested.
2. Go to the DIGITAL INPUTS test in the MANUAL I/O
TEST menu. (See Digital Inputs on page 103.) This test
shows whether the digital inputs are H (high, or open)
or L (low, or closed).
3. Attach a wire to the terminal of the digital input you
want to test. See tables 2.5 to 2.7 on pages 40 to 42 for
connections.
a) When the wire is connected only to the digital in-
put terminal, the digital input test should show
that the input is H (high, or open).
b) When you connect the other end of the wire to the
controller common (TB50 terminal 3 or TB18 ter-
minal 2), the digital input test should show that
the input is L (low, or closed).
Sensor Wiring
This section describes how to properly connect thermocou-
ples, RTDs, current and voltage inputs to your controller.
The controller can accept any mix of available input types.
Some input types require that special scaling resistors be
installed (generally done by Watlow Anafaze before the
controller is delivered).
All inputs are installed at the CH input connectors (TB1) at
the back of the controller. The illustrations below show the
connector locations for all the CLS200 series controllers.
CAUTION! Never run input leads in bundles with high
power wires or near other sources of EMI.
This could inductively couple voltage onto
the input leads and damage the controller, or
could induce noise and cause poor measure-
ment and control.