This page configures the temperature sensors. The IO-FEP2 contains an internal temperature sensor measuring the temperature on the circuit board. Additionally the IO-FEP2 offers inputs for up to four external (Pt-1000) temperature sensors which may be used to monitor the temperature of the equipment shelter, the antenna feed box or other locations. The IO-FEP2's temperature measurement-circuit is calibrated before delivery, That's the reason why the offset sometimes is not set to 0,0°C in delivery state.
The following properties may be configured for each temperature sensor.
Enable --- Setting this parameter to 'ENABLED' activates the monitoring for this sensor.
Name --- You may enter a descriptive name for the temperature value measured with this sensor. The name appears at the main ('State') page.
Offset --- Pt-1000 temperature sensors are very precise and do not require an individual calibration for simple monitoring applications. Nevertheless, a temperature offset may be defined for each sensor, e.g. to compensate for the cable resistance to the sensor. The displayed value is the sensor reading + the offset defined in this column. The IO-FEP2's temperature measurement-circuit is calibrated before delivery. That's the reason why the offset sometimes is not set to 0,0°C in delivery state.
Low/High Limit --- You may define temperature limits for each sensor. The IO-FEP2 signals a fault if a temperature is outside the given limits. To disable the limit checking, set the limits to values like -100 / +300.
Closed Loop --- Configures the IO-FEP2 to do perform closed loop temperature control with this sensor. This feature may be activated for the external sensors 2-5 and only if a sensor is activated. The following options may be set:
Target Temp --- The target temperature for the closed loop temperature control. (T_target)
Hysteresis --- The control loop hysteresis (T_hyst)
Control Output --- The output port used for the temperature control. Only outputs configured as TEMP-CTRL outputs may be used, you must configure the output before you can reference it in the temperature control.
Inhibit Input --- You may define an inhibit input which disables the control loop (forces the output to OFF) if active. All NORMAL or ALARM inputs may be used as inhibit input. Select 'none' if there shall be no input defined to inhibit the control loop.
The internal temperature sensor of the IO-FEP2 cannot be disabled, it's name is fixed to 'Board' and it's offset is fixed to '0.0'.