
Chapter 6: Troubleshooting and Reconfiguring CPC400 Series User’s Guide
144 Watlow Anafaze Doc. 0600-2900-2000
Control mode of one
or more loops
changes from auto-
matic to manual
Failed sensor
Check the display or HMI software for a
failed sensor message.
BCD job selection feature
loaded a different job
Check whether the new job was supposed
to be loaded. If not, check the BCD job
load setup:
Check the settings of the BCD job load
parameters in the
Global setup
menu.
Use the
Digital inputs
parameter in the
I/O
tests
menu to test the BCD job load
input(s).
Check the device that is used to activate
job selection.
All loops are in man-
ual mode at 0 per-
cent power
Intermittent power
Check wiring and service. See
Wiring the
Power Supply on page 24
.
Use a separate dc supply for the controller.
Provide backup power (uninterruptible
power system).
In the
Global
menu, set the
Power up loop
mode
parameter to
from memory
if safe for
your application. See
Power Up Loop
Mode on page 100
.
Analog reference voltage
overloaded
Disconnect any wiring from the +5V Ref
connection on TB1.
Hardware failure
Check the controller display for a hardware
alarm. See
System Alarms on page 143
.
Logic does not run
No logic program loaded
Load a logic program. For more informa-
tion, see the
LogicPro User’s Guide
.
Controller not set to run logic
on powerup
Run the logic program; see
Logic Program
on page 99
. If desired, set the controller to
start the logic program automatically upon
powerup; see
Power Up With Logic on
page 100
.
Controller does not
behave as expected
Corrupt or incorrect values in
RAM
Clear the RAM. See
Clearing the RAM on
page 153
.
Symptom Possible Causes Recommended Action
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