Watlow Series D8 - Manual (Page 45)

Series D8 User’s Guide Chapter 2: Installation
Doc. 0600-3120-2000 Watlow Anafaze 27
Digital Input Test
Use the following procedure to test digital inputs before con-
necting 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 2.6 on page 36 for TB 18 connections
or Table 2.7 on page 37 for TB50 connections.
a) When the wire is connected only to the digital input
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 D8 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.