Is there a flashing “S1 or S2” in the ALM: field on the front panel?
If the S1 or S2 is flashing the offending channel will also be displaying either P.OP or RANGE in the PV field on the front panel display. P.OP – indicates a probe open condition. Either the thermocouple or RTD input is open or the current or voltage input is out of the usable range. Correct the open probe condition and the control channel will immediately read the current PV value. If the P.OP condition can not be corrected the Analog input board of the instrument may be damaged. Contact TMC Services for repair services. RANGE – indicates that programmed or manual setpoint entered is outside of the Span-Setpoint Limits range configured for the control channel. If the setpoint appears to be within the desired usable range check the controllers Span-Setpoint limits. They may have been changed and not restored. The limits determine the Max and Min setpoints that can be entered. They also determine the total span of the controller. A Max of 200 and Min of -100 establish a span of 300. Man
