Section 3
3.8 Remote
Diagnostics
To setup the remote control on the furnace for troubleshooting by FurnacePros from the factory, make sure
the system is connected to the internet. Use wireless USB port if hard wiring is not feasible.
Do not disconnect the network cable connected to the furnace computer motherboard
TCP/IP port. This port is dedicated to communication with the furnace PLC.
Enable LogMeIn by clicking on blue icon on lower right of screen and enable.
Contact factory service tech and indicate system is on-line and available for troubleshooting.
See 2.10 Remote Access for more information on how to setup for remote diagnostics.
3.9 Process
Problems
3.9.1 Belt
speed
Measure the belt speed with a stopwatch. If it differs from the value on the process screen by more than 5%
(1 IPM off for each 20 IPM of belt speed), re-calibrate the belt speed. Follow the Belt Speed Calibration
procedure in the furnace Reference Manual, Chapter 7.
3.9.2 Temperature or large power fluctuation
If the temperature fluctuates by more than 5 degrees in less than 20 seconds after you reached ready state, it
might be a problem with the PID. Go to the PID tuning screen for that particular zone.
If the SCR is out of calibration, most likely it will not be noticeable in the medium range of the temperature.
Only at low temperature (<100°C) or near the maximum temperature, will there be deviation from the
setpoint. See the SCR Calibration procedure in the Documentation Section.
3.10 Abnormal sensor behavior
There are numerous sensors (standard and optional) on the furnace, from thermocouple to a board counter,
gas analyzer, and so on. If one particular sensor seems to behave erratically, you will need to look into the
value reported by the control subsystem.
The errors could be
• a temperature with a negative value,
• a gas analyzer readout that never changes value,
• a board counter that doesn’t count.
For the digital sensors, first locate the relay module connected to that sensor on the OPTO panel, using the
Channel Assignment configuration sheet. The red LED should toggle every time the sensor changes state. If
it doesn’t, the problem is with the sensor or the wiring. Most unlikely the relay module itself.
If the relay does toggle, make sure the module is talking to the controller; the TX LED should be flashing.
The analog inputs cannot be checked visually.
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