nVent RAYCHEM Elexant 4010i/4020i User Manual
RAYCHEM-AR-H60624-40X0iOpsManual-EN-1905 nVent.com
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3.1.2.1 On/Off (Default)
The controller monitors the temperature of the heating circuit and compares it to the setpoint tempera-
change its state.
Control Sensor Temperature Output State
Setpoint + deadband Off
Setpoint or below On
Within deadband No change
Table 3 - On/Off Control Status
3.1.2.2 PASC (Proportional Ambient Sensing Control)
-
ture, while minimizing energy consumption and wear on the contactor.
maintain a near-constant pipe temperature.
PASC takes advantage of the fact that the heat loss from a pipe is proportional to the temperature differ-
3.1.2.3 Proportional
The Proportional algorithm monitors the temperature of the heating circuit and compares it to the
is applied to the heat trace circuit with a duty cycle of 100%. If the temperature is equal to or greater than
-
perature is constantly monitored, and the output duty cycle is adjusted proportionally once per second.
Control Sense Temperature Duty Cycle
0%
50%
Setpoint 100%
Table 4 - Proportional Control vs Duty Cycle
Note:
3.1.2.4 Always On
The controller output is permanently switched on and power is applied to the heat trace circuit.
3.1.2.5 Always Off
The controller output is permanently switched off and power is removed from the heat trace circuit.
3.1.3 Output Overrides
Loss, and Limiter Trip.
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