Watlow CPC400 - Manual (Page 158)

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