My control channel reads P.OP or a very low or high value. How do I check it?
A simple check can be made to verify that the analog board input is functional. This check can not be used for RTD inputs. Thermocouple or Linear input types: Go to the Controller configuration and select Degrees C for the Units and Type_T_TC for the Input. Remove the sensor wires from the input terminal block. Using a jumper (a piece of wire or paper clip works nicely) short the thermocouple input pins probe 1 (or 2) plus and minus. The control channel should read the temperature of the Cold Junction Device, approximately 25 to 40 deg C and be stable. If not, contact TMC Services for repair options. If it is good a calibration may be necessary. Configure the channel for its correct units and input type and perform a calibration. RTD: Disconnect the three wires from the RTD to the input terminal strip. Connect a 100 ohm resistor across the Probe 1 plus and minus input pins. Connect a jumper across the ISO GND and negative input pins. The controller should read 0.0. If the reading is of
