6-30
I
Troubleshooting
Checking the RTD
WARNING: Electrical Shock Hazard
Only qualified service personnel who have been trained on electrical testing and
the procedures for avoiding the hazards should diagnose or correct problems that
require opening the unit with power on.
The Thermolator uses a Pt100 RTD to monitor the “to process” and “from process”
temperature. One Pt 100 RTD is installed in the wall of the heater tank at the “to pro-
cess” outlet. The other is installed in the mixing tank (or heat exchange) near the “from
process” outlet.
Sensor error codes (
Er.
) displayed by the temperature controller may indicate RTD
failure.
To check a RTD after a sensor error:
1
Disconnect and lockout the main power.
2
Open the electrical enclosure door.
Turn the screw on the front panel counterclock-
wise to open.
3
R
emove RTD wiring terminal strip.
Refer to the wiring diagrams that came with
your unit.
4
Verify the resistance of the RTD using a VOM. Polarity does not matter. If in-
correct, replace.
Refer to the table on the nest page.
(Continued)
Summary of Contents for Thermolator TW-P
Page 6: ...iv I Table of Contents ...
Page 12: ...1 6 I Introduction ...
Page 36: ...3 14 I ...
Page 58: ...4 22 I Operation ...
Page 72: ...5 14 I Maintenance ...
Page 128: ...E 4 I Appendix ...
Page 134: ...G 4 I Appendix ...
Page 136: ...H 2 I Appendix ...