7037/7038/7040/7041
User's Guide
56
Problem
Causes and Solutions
The display flashes “cutout” and an
incorrect process temperature
The problem may be that the controller’s voltmeter
circuit is not functioning properly. A problem could
exist with the memory back-up battery. If the battery
voltage is insufficient to maintain the memory, data
may become scrambled causing problems. A nearby
large static discharge may also affect data in memory.
The memory may be reset by holding the “SET” and
“EXIT” keys down while power to the controller is
switched on. The display shows “—init—” indicating
the memory is being initialized. At this point, each of
the controller parameters and calibration constants
must be reprogrammed into memory. You can obtain
the calibration constants from the test results sheet of
the calibration report.
If the problem reoccurs, the battery should be
replaced. Contact an Authorized Service Center for
assistance. If initializing the memory does not remedy
the problem, there may be a failed electronic
component. Contact an Authorized Service Center for
assistance.
The displayed process temperature is in
error and the controller remains in the
cooling or the heating state at any set-point
value
Possible causes may be either a faulty control probe
or erroneous data in memory. The probe may be
disconnected, burned out, or shorted. Check that the
probe is connected properly. The probe may be
checked with an ohmmeter to see if it is open or
shorted. The probe is a platinum 4-wire Din 43760
type, therefore, the resistance should read 0.2 to 2.0
ohms between pins 1 and 2 on the probe connector
and 0.2 to 2.0 ohms between pins 3 and 4. The
resistance should read from 100 to 300 ohms
between pins 1 and 4 depending on the temperature.
If the probe is defective, contact an Authorized
Service Center for assistance.
If the problem is not the probe, erroneous data in
memory may be the cause. Re-initialize the memory
as discussed in the problem “The display flashes
“cutout” and an incorrect process temperature” above.
If the problem remains, the cause may be a defective
electronic component, contact an Authorized Service
Center for assistance.
