Testing control output devices, Testing the tb18 and tb50, Testing control and digital outputs – Watlow CLS200 User Manual
Page 189: Testing digital inputs
CLS200 Series User’s Guide
Chapter 9:Troubleshooting and Reconfiguring
Doc.# 0600-3050-2000
Watlow Anafaze
173
Testing Control Output Devices
Connect the solid state relay (SSR) control terminals to the
CLS200 control output and connect a light bulb (or other
load that can easily be verified) to the output terminals on
the SSR. Put the loop in manual mode and set the output
to 100%. The ac load should turn on.
Do not attempt to measure ac voltage at the SSR’s output
terminals. Without a load connected, the SSR’s output ter-
minals do not turn off. This makes it difficult to determine
whether the SSR is actually working. Measure the voltage
across a load or use a load that can be visually verified,
such as a light bulb.
Testing the TB18 and TB50
1.
Turn on power to the controller.
2.
Measure the +5V
Î
(dc) supply at the TB18 or TB50.
The voltage should be +4.75 to +5.25V
Î
(dc):
a)
Connect the voltmeter’s common lead to the TB18
screw terminal 2 or TB50 screw terminal 3.
b)
Connect the voltmeter’s positive lead to the TB18
or TB50 screw terminal 1.
Testing Control and Digital Outputs
1.
Turn off power to the controller.
2.
Disconnect any process output wiring on the output to
be tested.
3.
Connect a 500
Ω
to 100 k
Ω
resistor between the
+5V terminal (TB18 or TB50 screw terminal 1) and the
output terminal you want to test.
4.
Connect the voltmeter’s common lead to the output
terminal, and connect the voltmeter’s positive lead to
the +5V terminal.
5.
Restore power to the controller.
6.
If you are testing a PID control output, use the
MAN/
AUTO key to turn the output on (100%) and off (0%).
When the output is off, the output voltage should be
less than 1V. When the output is on, the output volt-
age should be between +3.75 and +5.25V.
7.
If you are testing a digital output not used for control,
use the MANUAL I/O TEST menu to turn the output on
and off. See Manual I/O Test on page 103.
Testing Digital Inputs
1.
Turn off power to the controller.
2.
Disconnect any system wiring from the input to be
tested.