Common Current Sensor Monitoring

Common current sensor is used for all the zones in the group. If three phase zones are used then three current sensors are required for each phase. User needs to define following variables for common sensor current monitoring.

Selecting single or three phase current monitoring:

System will understand whether single or three phase heaters are used using “TECT_PROCESS_SET_TYPE“ Structure “wControlWord“ variable bit 14. If this bit is turned on then it means three phase current monitoring is selected else single phase current monitoring is selected.

xEn_Co_Monitor:

User can must set “xEn_Co_Monitor“ variable TRUE in the group data to turn on current monitoring feature for common current sensor.

rRated_Current:

User should use this variable from “TECT_MACHINE_SET_TYPE “ structure for connecting rated current of the heater. For 3 phase heaters same rating is used for balancing. Hence only one variable for rated current is sufficient for all three phases.

arActual_Current:

User should use this variable from “ TECT_GROUP_DATA_TYPE“ structure for connecting actual current measured from the sensor. If single phase heater is used then only first array element should be connected. For 3 phase heaters sensor input needs to be connected to 3 array elements respectively.

timMonitorCycle_Time:

Monitor cycle can be defined in seconds by user in “ TECT_GROUP_DATA_TYPE“ structure varaiblevariable. At the start of this duration Zones enter in current monitoring function. One after another zones are checked untilluntil “timMonitorStep_Time“ is elapsed. After this monitoring function is stopped, zone number is stored internally and control of the zones goes back to process till “timMonitorCycle_Time“ elapsed. On next cycle monitoring function starts from internally stored zone number. Once all zones are checked, function will start monitoring from zone 1 again.

It is recommended that user should set a value around 150-300 seconds.

timMonitorStep_Time:

Monitor cycle can be defined in seconds by user in “ TECT_GROUP_DATA_TYPE“ structure variable. In the monitoring cycle when this time is elapsed current monitoring function stops and control of the zones goes back to process.

wErrors2:

This variable in TECT_PROCESS_STATUS_TYPE structure shows current monitoring status of the zone. If error is condition is removed, then error will be removed and it does not require RESET.

timLastMeasurement

This variable in “TECT_GROUP_DATA_TYPE“ structure shows time taken by all the zones to complete monitoring function in the last measurement.