30
|
nVent.com/RAYCHEM RAYCHEM-OM-EU2032-NGCUIT3EX-EN-2203
In general, up to three additional RTDs can be associated with this Circuit. When the system is fully functional, the lowest RTD value
from the list of four will be used for control temperature. If no RTD is connected to the input terminals for this Circuit, then all four
lines can be used to assign RTDs from elsewhere in the system. However, in the event of a communications or UIT3 failure, no RTD
input is available and the relay output for this Circuit goes to the failsafe mode established in the Setup|Circuit window.
Fig. 3.11 Setup | RTDs window- Four RTDs are assigned to the circuit
Each RTD can be set to operate in two modes: Control or Monitoring. If an SES is used as a Continuity sensor, a third option for
Continuity is also selectable. If an RTD is set to Control, the output of the Circuit will be based on this RTD in conjunction with any
other Control RTDs in Auto On/Off mode. These RTDs will also trigger temperature alarms and cutouts. However, if an RTD is set to
Monitoring, its temperatures will not be used to control the circuit's relay output. RTDs set to Monitor will trigger temperature alarms
but not high temp cutout. A RTD mode set to Continuity will only report that power has reached the SES module.
The table below indicates the RTD Mode (RTD application) options for each RTD device.
.
RS-
Hard-wired, local CRM/CRMS the same
circuit
Direct X -- --
Hard-wired, not local CRM/CRMS
another circuit Direct X X --
Hard-wired, local Elexant 5010i / NGC-20 Direct X -- --
Serial RMM2 Direct X X --
Serial PLI-SES/SPC via SES-RTD X X --
Serial PLI-SES/SPC No RTD -- -- X
Serial PLI-SES/SPC via SES-SPC X X --
Serial PLI-TT via 700-TT X X --
The SES-CONT device does not have any RTDs, thus can not control or monitor the temperature. Therefore, the only
RTD Mode that can be selected is Continuity. In Continuity Mode, the integrity of the heat-tracing system is monitored.
To Next Page
Loading...
Need help?
General
