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nVent.com/RAYCHEM RAYCHEM-OM-EU2032-NGCUIT3EX-EN-2203
Fig. 2.13 Setup | Circuit window and Fail Safe button
Pressing the Fail Safe toggle button alternates the Fail Safe mode between Power Off and PowerOn. This selection tells the
NGC-30-CRM/-CRMS if the heater should be turned on or off ifall of the RTD(s) for this Circuit fail.
If the main concern is to prevent pipes from freezing, then Power On is a good choice. However, ifthe heater is oversized and
overheating is a concern, then Power Off could be a better choice.
Fig. 2.14 Setup | RTDs window
• The NGC-30 program first checks to see if the default RTD is available. On any NGC-30-CRM/-CRMS board, the first RTD input is
automatically coupled with the first relay output; the second RTD is linked with the second output relay, etc. (In the case an RMC -
RMM2 combination is chosen, then the user must define himself which RTD Device address is coupled with the RMC output.)
• Here an RTD has been connected to the RTD 1 terminal block, so the RTD set-up window indicates the default assignment is
already completed
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