ShuntNormalizedTemperatureFactor Parameter
Default Value: 0
Minimum Value: 0
Maximum Value: None
Units: None
Type: float
HARDWARE: This parameter applies only to the iXC6e, XC6e, and the -SX1 options of the iXC4, XC4, iXC4e, and XC4e.
The ShuntNormalizedTemperatureFactor parameter is used to calculate the temperature of the shunt resistor. If the shunt resistor temperature is more than 200° C, an Amplifier Temperature Fault occurs. The calculation of the shunt resistor temperature is an open loop estimation. Therefore, the ShuntNormalizedTemperatureFactor parameter must be set correctly for shunt temperature monitoring to operate correctly.
You can calculate an appropriate value for the ShuntNormalizedTemperatureFactor with the equation that follows.
Where
Tss is the steady-state shunt resistor temperature if it was to be left on indefinitely at the average bus voltage level.
For the internal shunt resistor of the iXC6e or XC6e, you should set the ShuntNormalizedTemperatureFactor as follows:
-
iXC6e or XC6e with -240V option = 40
-
iXC6e or XC6e with -480V1 or -480V2 option = 57
If you are using an external shunt resistor, you must experiment to get the value for the ShuntNormalizedTemperatureFactor parameter. Accurate calculation of the shunt resistor temperature depends on the specific resistor and the application details.
To disable shunt temperature monitoring, set the ShuntNormalizedTemperatureFactor parameter or the ShuntThermalTimeConstant Parameter to 0.
