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I have a model with a heater controller connected to a thermal load. When
looking at the applied load value, it does not match what I specified in the
thermal load object. Why am I not seeing the full value I specified?
Solution
There are three types of heater controllers available in NX Thermal/Flow:
Proportional, PID controller, and Thermostat. The first two, Proportional and
PID controller, scale the load based on how far the sensor element is away
from the defined set point(s). They vary in how the scaling is defined, but
they are both proportional type controllers.
If the desire is to have a simple on/off for your load, then the user needs to
select the third type, thermostat. With the thermostat heater controller when
the temperature of the sensor element, or average temperature of the sensor
elements, is below the cut-in temperature, the full load is applied. When the
temperatuer of the sensor element reaches the cut-off temperature, then the
load is turned fully off.
For more details on these heater contollers see the following documents:
PID and Proportional heater controllers:
https://docs.plm.automation.siemens.com/tdoc/nx/10.0.3/nx_help/#uid:index_advan
ced:xid389653:id1126083:id624386:id628376
Thermostat heater controller:
https://docs.plm.automation.siemens.com/tdoc/nx/10.0.3/nx_help/#uid:index_advan
ced:xid389653:id1126083:id624386:id628636
Notes