Appendix D. Proportional Ambient Sensing Control (Pasc); Appendix E. Rtd Device / Rtd Number Entry Windows; Monitor-Only Mode; Control Mode With Local Rtd Installed - Pentair raychem ngc-30/uit2 Programming Manual

aPPendiX d. ProPortionaL amBient sensinG ControL (PasC)

aPPendiX e. rtd deViCe / rtd numBer entry WindoWs

industrial heat tracing solutions
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 +3°F" the heaters will be on
100%. If the measured ambient is at or above the "maintain temperature –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).
Ambient temperature
Minimum
ambient
temperature

monitor-onLy mode

Select one to four RTDs to monitor the temperature of a pipe, vessel etc. An RTD can be used from
another Relay/RTD or from a RMM2 module mounted in the panel or remotely.

ControL mode With LoCaL rtd instaLLed

If the local RTD is installed, up to three additional RTDs can be used to monitor the temperature
of the pipe, vessel, etc. An RTD can be used from another Relay/RTD or from a RMM2 module
mounted in the panel or remotely. If more than one RTD is assigned to a Circuit, the NGC-UIT2 will
display the lowest temperature detected on the main window. However, it will alarm (high and low
temperature) based upon all RTDs assigned to that Circuit.

ControL mode Without LoCaL rtd instaLLed

If the local RTD is not installed, up to four additional RTDs can be used to monitor the temperature
of the pipe, vessel, etc. An RTD can be used from another Relay/RTD or from a RMM2 module
mounted in the panel or remotely. If more than one RTD is assigned to a Circuit, the NGC-UIT2 will
display the lowest temperature detected on the main window. However, it will alarm (high and low
temperature) based upon all RTDs assigned to that Circuit.
imPortant: If an address entered is lower than any NGC-30-CRM/-CRMS board found on the
system, the Raychem NGC-30 software defaults to 0. Since 0 is not a valid address for any board,
selecting 0 tells the program that this Circuit will not be used for any output control; by default, it
will be a "Monitoring Only" Circuit. This is the method for setting up a Circuit as an "Alarm Only"
channel.
imPortant: The NGC-UIT2 displays the parameters of heaters. It also is a means to input
information to the NGC-30-CRM/-CRMS. Once the system is set up, the NGC-30-CRM/-CRMS
controls the heater Circuits, and even if the NGC-UIT2 display loses communications between
the NGC-30-CRM/-CRMS and the NGC-UIT2, the heaters are still being controlled by the NGC-
CRM/-CRMS. A feature of the -CRM/-CRMS is that if it is hardwired to the system, the system still
continues to work.
EN-RaychemNGC30UIT2Programming-AR-H58186 02/16
Pipe
maintain
temperature
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