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nVent.com/RAYCHEM RAYCHEM-OM-EU2032-NGCUIT3EX-EN-2203
nVent RAYCHEM NGC-
This nVent manual describes how both the nVent RAYCHEM Elexant 5010i, nVent RAYCHEM NGC-20 and nVent RAYCHEM NGC-30
can be programmed via the User Interface Terminal (nVent RAYCHEM NGC-UIT3-EX). The Elexant 5010i, NGC-20 and NGC-30 are part
of the same family of controllers.
The Elexant 5010i and NGC-20 is a compact networked single point heat-trace controller with an approved integral safety temperature
limiter (SIL 2). The controllers are approved for use in Zone 1 and Zone 2 hazardous areas and can be mounted directly on the
heat-traced pipe. Up to 247 individual controllers can be connected in a single RS-485 multi drop “daisy chained” network and
communicate to a central user interface, the NGC-UIT3-EX. Up to two temperature sensors can be connected directly to the controller.
The limiter has its own temperature sensor.
The NGC-30 is a multipoint electronic control, monitoring and power distribution system for heat-tracing used in process-temperature
maintenance and freeze-protection applications. The NGC-30 system can control up to 260 heat-tracing circuits with multiple
networked panels. Each panel can control up to 40 individual heat-tracing circuits and monitor up to 128 temperature inputs, with
optional power distribution. The NGC-30 is available with two output types: Electromechanical Relays (EMRs) or Solid-State Relays
(SSRs). Both types allow switching up to 60 amps at 600 Vac with single or three-phase power. Up to four Resistance Temperature
Detector (RTD) sensor inputs for each heat-tracing circuit allows for a variety of combinations of temperature control, monitoring, and
alarming. Systems can be configured for nonhazardous and hazardous locations. The ability to monitor and configure the controller
is available both locally and remotely with the nVent RAYCHEM Supervisor software.
NGC-UIT3
NGC-30
Panel
Field located
RMM2
To next
RMM2
N
-
P
n
RS-485
Fig. 1.1 NGC-30 system, system example
The NGC-30 measures temperatures with 3-wire, 100-ohm platinum RTDs connected directly to the unit, or through optional Remote
Monitoring Modules (RMM2 module). Each RMM2 module accepts up to eight RTDs. The RMM2 modules are typically located near
the desired measurement location (RTDs). Multiple RMM2 modules are networked over a single cable to the
NGC-30, significantly reducing the cost of RTD field wiring. The NGC-30 system supports 260 temperature inputs via the CRM/
CRMS boards. Using RMM2 modules, an additional 128 temperature inputs can be supported for a maximum of 388 temperature
inputs. With EMRs and SSRs, the NGC-30 can be configured for On/Off, ambient sensing, and proportional ambient sensing modes.
Additionally, with SSRs, the panel can be configured for proportional, power limiting, and soft start modes.
The controllers can monitor multiple independent Electrical Heat-Tracing (EHT) parameters. The controllers monitor continuously
temperature, voltage, current and ground fault current leakage and report the values including alarms to the UIT. An automated self-
check feature is available where the systems periodically checks the heating cables for faults and report the result to the UIT. This
helps to avoid costly downtime. Dry contact relays are provided for alarm annunciation back to a Distributed Control System (DCS).
NEC
National electrical codes (NEC - North America) require ground-fault equipment protection on all heat-tracing circuits. Heat-tracing
circuits equipped with NGC-30 controllers do not require additional ground-fault detection equipment, simplifying installation and
reducing costs. When applying the IEC standards, additional RCD circuit breaker is required.
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