- 40 -
No/poor temperature control
On Digital Plus controllers, check Serial Communication Mode on or off.
Check controller PID values. See next page for factory preset values.
NOTE: Using high viscosity fluids at low temperatures may require PID adjust-
ment, contact Thermo.
Calibrate internal temperature sensor.
Check optional external sensor connection. Perform calibration.
High Temperature Cutout activated, see page 28.
No serial communications
All units are tested for serial communications before they leave the factory.
Ensure the Computer indicator on the controller is on.
Check all settings and commands, they must be exact. See Appendix B.
Check all wiring for proper connections or possible shorts.
Software to verify serial communication is available from Thermo.
Service Assistance
If, after following these troubleshooting steps, your unit fails to operate
properly, contact our Service Department for assistance, see back cover.
Before calling, please obtain the following information:
- unit BOM number
- unit serial number
- software version
- voltage of power source
- fluid used
PID Values
The factory set PID values for most units are:
PI D PI D
Cool 0.6 0.6 0.0 Heat 0.6 0.6 0.0
The factory set COOL PID values for 100V and 115V RTE 740s are:
PI D
Cool 0.4 0.6 0.0
The factory set HEAT PID values for 230V RTE 740s are:
PI D
Heat 1.2 0.6 0.0
Thermo does not recommend changing the PID values. Incorrect PID values
will hamper unit performance.
Troubleshooting
To Next Page
Loading...
Need help?
General
