nVent RAYCHEM NGC-40-HTC3 Control and Monitoring Modules Installation Guide
- June 10, 2024
- nVent RAYCHEM
Table of Contents
NGC-40-HTC3 Control and Monitoring Modules
Product Information
The NGC-40-HTC and NGC-40-HTC3 are control and monitoring modules designed for
use with the nVent RAYCHEM NGC-40 system.
These modules are approved and certified for use in hazardous locations,
conforming to various FM and UL standards. The NGC-40-HTC is suitable for
single-phase heaters, while the NGC-40-HTC3 is suitable for three-phase
heaters. The modules come with temperature sensors, alarm relay, digital
input, CAN networking port, line current sensors, and ground-fault sensor,
among other features.
Kit Contents
- NGC-40-HTC module (single-phase heaters) or NGC-40-HTC3 module (three-phase heaters)
Installation Instructions
Installation of the NGC-40-HTC and NGC-40-HTC3 modules should be carried out by a qualified electrician. These modules are electrical devices and must be installed correctly to prevent shock or fire. Refer to the product manual for detailed installation instructions.
Product Usage
The NGC-40-HTC and NGC-40-HTC3 modules are designed to control and monitor heaters in hazardous locations. These modules can be used in various applications such as freeze protection and temperature maintenance of pipes, tanks, and vessels, among others.
The temperature sensors can be extended with a 2-wire shielded cable of up to 20 maximum per conductor. The alarm relay is programmable with NO and NC contacts available. The digital input is multi-purpose and can be configured to be active open or active closed. The CAN networking port allows communication between multiple devices in the NGC-40 system. The line current sensors can measure up to a maximum current with high accuracy. The ground- fault sensor detects any ground-faults and triggers the alarm relay.
Refer to the product manual for detailed usage instructions and programming options of the digital input and alarm relay.
NGC-40-HTC & NGC-40-HTC3
Control and monitoring modules for use with nVent RAYCHEM NGC-40 system Installation Instructions
APPROVALS AND
CERTIFICATIONS
Hazardous Locations
Class I, Div. 2, Groups A,B,C,D T4 Class I, Zone 2, AEx nC IIC T4 IP20 Ex nL
nC IIC T4 X
–40˚C ≤ Ta ≤ +65˚C
Conforms to:
FM Class Number 3600 (11/98) FM Class Number 3611 (10/99) ANSI/UL STD.
60079-15-2009 UL STD. 61010-1
Certified to:
CAN/CSA STD. C22.2 No. 213-M1987 (R2004) CAN/CSA STD. C22.2 No. 61010-1:2004
EN 61010-1 (2001)
CAN/CSA STD. E60079-15:02 (R2006)
IEC Ex Markings: IEC Ex ETL17.0062X Ex ec nC IIC T4 Gc
ATEX Markings: ITS17ATEX402833X
II 3 G Ex ec nC IIC T4 Gc
DESCRIPTION
The nVent RAYCHEM NGC-40-HTC (for single-phase heaters) and NGC-40-HTC3 (for three-phase heaters) modules are used to control either an external solid- state relay or a contactor within the NGC-40 control and monitoring system. These modules also have one alarm output and one digital input. The alarm output can be used to activate an external annunciator. The digital input is programmable and may be used for various functions such as forcing outputs on and off. Other features include ground-fault and line current sensing for both HTC and HTC3. The front panel of the HTC modules has LED indicators for various status conditions. The front panel also provides a ground-fault and heater test button.
TOOLS REQUIRED
- Small flat-blade screwdriver
ADDITIONAL MATERIALS
- Power supply 24 Vdc @100 mA per NGC-40-HTC/HTC3
- Custom built CAN cables with RJ-45 connections
- CAN Termination Resistor
- Custom built CAN cables with RJ-45 connections
- CAN Termination Resistor
KIT CONTENTS
| Item | Qty | Description |
|---|---|---|
| A | 1 | NGC-40-HTC module (single-phase heaters) |
or
B| 1| NGC-40-HTC3 module (three-phase heaters)
Special conditions of use
- The overall equipment is evaluated to type of protection “ec”. Sealed devices in the form of relays are additionally present in module NGC-40-HTC and NGC-40-HTC3 and comply with requirements for the type of protection nC.
- For full connection details see these installation instructions.
- The equipment shall only be used in an area of not more than pollution degree 2, as defined in IEC/EN 60664-1.
- The equipment shall be installed in an enclosure that provides a minimum ingress protection of IP54 in accordance with IEC/EN 60079-0.
- Transient protection shall be provided that is set a t a level not exceeding 140% of the peak rated voltage value at the supply terminals to the equipment.
WARNING: This component is an electrical device that must be installed correctly to ensure proper operation and to prevent shock or fire. For technical support, call nVent at 800-545-6258.
GENERAL
| Supply voltage | 24 Vdc ± 10% |
|---|---|
| Internal power consumption | < 2.4 W per NGC-40-HTC/HTC3 module |
| Ambient operating temperature | –40ºC to 65ºC (–40ºF to 149ºF) |
| Ambient storage temperature | –55ºC to 75ºC (–67ºF to 167ºF) |
| Environment | PD2, CAT III |
| Max. altitude | 2,000 m (6,562 ft) |
| Humidity | 5 – 90% noncondensing |
| Mounting | Din Rail – 35 mm |
ELECTROMAGNETIC COMPATIBILITY
Emissions| EN 61000-6-3 Emission standard for residential, commercial and
light industrial environments
---|---
Immunity| EN 61000-6-2 Immunity standard for industrial environments
TEMPERATURE SENSORS
Type| 100 Ω platinum RTD, 3-wire, α = 0.00385 ohms/ohm/ºC Can be extended with
a 3-conductor shielded cable of 20 Ω maximum per conductor 100 Ω, Ni-Fe,
2-wire Can be extended with a 2-wire shielded cable of 20 Ω maximum per
conductor
---|---
Quantity| One per NGC-40-HTC/HTC3 module
ALARM RELAY
Dry contact relay (voltage free)| Relay contact rated 250 V / 3 A 50/60 Hz
(EC) and 277 V / 3 A 50/60 Hz (cCSAus). Alarm relay is programmable. NO and NC
contacts available.
---|---
CONTACTOR OUTPUT RELAY
- Relay contact rated 250 V / 3 A 50/60 Hz (CE) and 277 V / 3 A 50/60 Hz (c-CSA-us).
DIGITAL INPUT|
---|---
Multi-purpose input| Multi-purpose input for connection to external dry
(voltage-free) contact or DC voltage. May be user programmable for: not used /
force off / force on functions. It can be configured to be active open or
active closed.
CAN NETWORKING PORT
Type| 2-wire isolated CAN-based peer to peer network. Isolated to 24 Vdc –
verified by 500 Vrms dielectric withstand test
---|---
Connection| Two 8-pin RJ-45 connectors (both may be used for Input or Output
connections)
Protocol| Proprietary NGC-40
Topology| Daisy chain
Cable length| 10 m (33 ft) maximum
Quantity| Up to 80 HTC/HTC3 and IO modules per network segment
Address| Unique, factory assigned
CONNECTION TERMINALS
| Wiring terminals | Cage clamp, 0.5 to 2.5 mm2 (24 to 12 AWG) |
|---|
HOUSING
| Size | 45.1 mm (1.78 in) wide x 87 mm (3.43 in) high x 106.4 mm (4.2 in) deep |
|---|
LINE CURRENT SENSORS
| Max current | 63 A |
|---|---|
| Accuracy | ± 2% of reading |
GROUND-FAULT SENSOR
| Range | 10 – 250 mA |
|---|---|
| Accuracy | ± 2% of range |
OUTPUTS
| SSR output | 12 Vdc @ 45 mA max per output |
|---|
System Components
Mounting the NGC-40-HTC/HTC3
Each NGC-40-HTC/HTC3 mounts on a DIN 35 rail.
MOUNTING: Insert the rear bottom of the module into the DIN rail, then
push up and inwards to engage the clip.
REMOVAL: Push the module upwards to disengage the clip, then rotate the module toward you.
Power Supply/CAN
The power supply/CAN connector is an RJ-45 connector.
The CAN termination device must be installed in the unused port of the last
module.
Connections are the same for the HTC3.
RTD Input Connections – North American Installation Technique
For all RTD terminations, the RTD field wires must be terminated on a
panel-mounted terminal block.
Connections are the same for the HTC3. 
RTD Input Connections – European Installation Technique
For all RTD terminations, the RTD field wires must be terminated on a
panel-mounted terminal block. The RTD cable shield from the field terminal
block to the HTC module should be terminated at the earth ground bar located
near the module.
Connections are the same for the HTC3. 
Power Supply/CAN
Terminals 9 and 11 switch voltage to the contactor coils. The internal
pilot relay will switch the supply voltage (up to 277 V) to the contactor
coil. Refer to the diagram at the end of this document called “NGC-40 CAN bus
Connections for Up to 10 Modules” for detail wiring.
Note: Exposure to some chemicals may degrade the sealing properties of
the relay output, manufactured by NAIS, PN JQ1P-12V. Periodically inspect the
relay output for degradation of properties and replace if any degradation is
found.
Connections are the same for the HTC3. 
WARNING: Shock Hazard. Disconnect from live voltage prior to accessing terminals.
HTC3 Relay Output to Contactor – Three-Phase 
WARNING: Shock Hazard. Disconnect from live voltage prior to accessing terminals.
HTC Output Connections to SSR – Single-Phase
Terminals 5 & 6 switch voltage to the SSR. The internal SSR driver will switch
the internal supply voltage (12 Vdc) to the SSR.
HTC3 Output Connections to SSR – Three-Phase
WARNING: Shock Hazard.
Disconnect from live voltage prior to accessing terminals.
Alarm
WARNING: Shock Hazard. Disconnect from live voltage prior to accessing
terminals.
Note: Exposure to some chemicals may degrade the sealing properties of
the alarm relay, manufactured by NAIS,
PN JQ1P-12V. Periodically inspect the alarm relay for degradation of
properties and replace if any degradation is found.
Multi-purpose. Alarm relay energized in normal state.
The alarm relay is configured as Fail Safe.
The alarm relay connections provide a form C dry contact, rated at 277 V max
(3 A).
The NO (normally open) contact is open in non-energized condition. When
energized, it closes during normal conditions and will open upon an alarm
condition or power failure.
The NC (normally closed) contact is closed in non-energized condition. When
energized, it opens during normal conditions and will close upon an alarm
condition or power failure.
Relay contact rated
250 V / 3A 50/60 Hz (CE)
277 V / 3A 50/60 Hz (c-CSA-us)
Connections are the same for the HTC3. 
Digital Input Connections – North American and European Installation Techniques
- Digital Input Multi-purpose input for connection to external dry (voltage free) contact or DC voltage.
- Rating 100 Ω max loop resistance or 5-24 Vdc @ 1 mA maximum
Connections are the same for the HTC3.
**Provide Suitable Panel Enclosure and Determine Locations for NGC-40-HTC or NGC-40-HTC3 Assembly in Panel***
-
Provide suitable panel enclosure
The NGC-40-HTC or NGC-40-HTC3 must be mounted in an enclosure to protect its electronic components. For indoor applications, use a minimum NEMA 1 enclosure (NEMA 12 recommended). For outdoor applications, use a NEMA 4 or NEMA 4X enclosure depending on the requirements.
Note: The nVent RAYCHEM NGC-40-HTC or NGC-40-HTC3 is designed for operation in ambient temperatures from –40°C to 65°C (–40°F to 149°F). If the ambient temperature is outside this range, a space heater and/or cooling fan will be required in the panel. -
Determine locations for the NGC-40-HTC or NGC-40-HTC3 assembly in the electrical panel.
The NGC-40-HTC or NGC-40-HTC3 should be located in the rear of the panel. The NGC-40-HTC or NGC-40-HTC3 assembly is an electronic unit and must not be located where it will be exposed to strong magnetic fields or excessive vibration.
- North American panel installation techniques
NGC-40 CAN Bus Connections for Up to 10 Modules 
** Power supply shall have a means for disconnect from line voltage
NGC-40 CAN Bus Connections for Up to 20 Modules 
** Power supply shall have a means for disconnect from line
voltage
NGC-40 CAN Bus Connections for Up to 40 Modules
** Power supply shall have a means for disconnect from line voltage
Servicing
The NGC-40-HTC/HTC3 contains no user serviceable parts. Contact your nVent
representative for service and an RMA number if required.
WARNING: Explosion Hazard – Substitution of components may impair suitability for Class I, Division 2 hazardous and nonhazardous locations
WARNING: Explosion Hazard – Do not replace NGC-40-PTM unless power has been switched off or the area is known to be nonhazardous
WARNING: Explosion Hazard – Do not disconnect equipment unless power has been switched off or the area is known to be nonhazardous
North America
Tel +1.800.545.6258 Fax +1.800.527.5703
thermal.info@nVent.com
Europe, Middle East, Africa
Tel +32.16.213.511
Fax +32.16.213.604 thermal.info@nVent.com
Asia Pacific
Tel +86.21.2412.1688 Fax +86.21.5426.3167
cn.thermal.info@nVent.com
Latin America
Tel +1.713.868.4800 Fax +1.713.868.2333
thermal.info@nVent.com
©2022 nVent. All nVent marks and logos are owned or licensed by nVent Services
GmbH or its affiliates. All other trademarks are the property of their
respective owners. nVent reserves the right to change specifications without
notice.
RAYCHEM-IM-H58087-NGC40HTC-EN-2202
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>