Watlow CPC400 - Manual (Page 41)

CPC400 Series User’s Guide Chapter 2: Installation
Doc. 0600-2900-2000 Watlow Anafaze 27
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 I/O tests menu.
This test shows whether the digital inputs are off
(open) or on (closed).
3. Attach a wire to the terminal of the digital input you
want to test. See Table 2.5 on page 37 for TB 18 con-
nections or Table 2.6 on page 38 for TB50 connections.
a) When the wire is connected only to the digital in-
put terminal, the digital input test should show
that the input is off (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 on (closed).
Sensor Wiring
This section describes how to properly connect thermocou-
ples, RTDs, current and voltage inputs to the 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 CPC400 series controllers.
CAUTION! Never run input leads in bundles with high power
wires or near other sources of EMI. This could in-
ductively couple voltage onto the input leads and
damage the controller, or could induce noise and
cause poor measurement and control.