Appendix B. Proportional Control; Appendix C. Proportional Ambient Sensing Control (Pasc) - Raychem nvent NGC-UIT3-EX Programming Manual

Appendix B. Proportional Control
Table B.1 Proportional Control Temperature Band
Control Sensor Temperature
Setpoint + 2.22°C
Setpoint + 1.11°C
Setpoint
Table B.2 Approximate Time On/Off for 50/60 Hz Frequencies
Temperature
Set Point + 2.22°C
Set Point + 2.17°C
Set Point + 2.11°C
Set Point + 2.06°C
Set Point + 2.00°C
Set Point + 1.94°C
Set Point + 1.89°C
Set Point + 1.83°C
Set Point + 1.78°C
Set Point + 1.72°C
Set Point + 1.67°C
Set Point + 1.61°C
Set Point + 1.56°C
Set Point + 1.50°C
Set Point + 1.44°C
Set Point + 1.39°C
Set Point + 1.33°C
Set Point + 1.28°C
Set Point + 1.22°C
Set Point + 1.17°C
Set Point + 1.11°C
Appendix C. Proportional Ambient Sensing Control (PASC)
The power to the heat tracing is proportioned based upon on the ambient temperature. If the ambient temperature is at or below
the "minimum design ambient –16.1°C (3°F)" the heaters will be on 100%. If the measured ambient is at or above the "maintain
temperature –19.4°C (–3°F)" the heaters will be on 0%.
For any measured ambient between "minimum design ambient" and "maintain temperature," the heaters will be on a percentage of
the time equal to (maintain temperature – measured ambient) / (maintain temperature – minimum design temperature).
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Duty Cycle
0%
50%
100%
On Time/ Off Time/
Second (ms) Second (ms)
0 1000
25 975
50 950
75 925
100 900
125 875
150 850
175 825
200 800
225 775
250 750
275 725
300 700
325 675
350 650
375 625
400 600
425 575
450 550
475 525
500 500
Minimum
ambient
temperature
Temperature
Set Point + 1.06°C
Set Point + 1.00°C
Set Point + 0.94°C
Set Point + 0.89°C
Set Point + 0.83°C
Set Point + 0.78°C
Set Point + 0.72°C
Set Point + 0.67°C
Set Point + 0.61°C
Set Point + 0.56°C
Set Point + 0.50°C
Set Point + 0.44°C
Set Point + 0.39°C
Set Point + 0.33°C
Set Point + 0.28°C
Set Point + 0.22°C
Set Point + 0.17°C
Set Point + 0.11°C
Set Point + 0.06°C
Set Point + 0.00°C
Ambient temperature
Pipe
maintain
temperature
On Time/ Off Time/
Second (ms) Second (ms)
525 475
550 450
575 425
600 400
625 375
650 350
675 325
700 300
725 275
750 250
775 225
800 200
825 175
850 150
875 125
900 100
925 75
950 50
975 25
1000 0
RAYCHEM-OM-EU2032-NGCUIT3EX-EN-2203