nVent RAYCHEM NGC-40-SLIM User manual

Safety Temperature Limiter for use
with nVent RAYCHEM NGC-40 System
Sicherheitstemperaturbegrenzer für das
nVent RAYCHEM NGC-40-System
Limiteur de température pour système
nVent RAYCHEM NGC-40
ОГРАНИЧИТЕЛЬ ТЕМПЕРАТУРЫ ДЛЯ
ИСПОЛЬЗОВАНИЯ С СИСТЕМОЙ
nVent RAYCHEM NGC-40
NGC-40-SLIM
NGC-40 SAFETY TEMPERATURE LIMITER
STATUS
NETWORK
CURRENT
TS1
RESET
TS2
TS3
TRIP
ALARM
RESET
TRIP
RESET
SET
CONFIG

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Contents
1 Introduction .............................................................................................................................................................3
1.1 Certification .....................................................................................................................................................................3
1.2 Warranty ...........................................................................................................................................................................3
1.3 Limitation of warranty .....................................................................................................................................................3
1.4 Exclusive remedies..........................................................................................................................................................3
1.5 Statement of compliance................................................................................................................................................3
1.6 Area of use....................................................................................................................................................................... 4
1.7 Safety instructions ..........................................................................................................................................................4
1.8 Conformity with standards .............................................................................................................................................4
1.9 Approvals and certifications ..........................................................................................................................................5
2 Technical data .........................................................................................................................................................5
2.1 Product Description.........................................................................................................................................................5
2.1.1 Tools Required .................................................................................................................................................................... 5
2.1.2 Additional Materials required ........................................................................................................................................... 5
2.1.3 Kit Contents......................................................................................................................................................................... 5
2.1.4 General information ........................................................................................................................................................... 5
2.1.5 Measuring range................................................................................................................................................................. 5
2.1.6 Electromagnetic Compatibility......................................................................................................................................... 6
2.1.6.1 Emissions............................................................................................................................................................. 6
2.1.6.2 Immunity .............................................................................................................................................................. 6
2.1.7 Temperature Sensors ........................................................................................................................................................... 6
2.1.8 Alarm Relay............................................................................................................................................................................. 6
2.1.9 Contactor Output Relay. ...................................................................................................................................................... 6
2.1.10 Digital Input........................................................................................................................................................................... 6
2.1.11 CAN Networking Port ......................................................................................................................................................... 6
2.1.12 Connection terminals ......................................................................................................................................................... 6
2.1.13 NGC-40 Safety Limiter........................................................................................................................................................ 6
2.1.14 NGC-40-SLIM accessories and associated components..................................................................................6
2.1.15 Dimensions .......................................................................................................................................................... 7
2.2 Mounting and wiring NGC-40-SLIM module ..................................................................................................................8
3 Safety instructions for NGC-40-SLIM .....................................................................................................................13
3.1 Area of use.....................................................................................................................................................................13
3.2 Safety function of temperature limiter in NGC-40-SLIM .............................................................................................13
3.3 Temperature limiter (schematic)..................................................................................................................................13
3.4 Reset Safety Temperature Limiter................................................................................................................................14
3.5 Temperature setting secured and locked to prevent manipulation............................................................................14
3.6 Changing limiter set point.............................................................................................................................................14
3.7 Procedure to write new temperature set point to limiter ............................................................................................14
3.8 Test in the event of a fault.............................................................................................................................................14
3.9 Safety related system characteristics..........................................................................................................................15

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1 INTRODUCTION
Please read all instructional literature carefully and thoroughly before starting. Refer to the inside front cover for the
listing of Liabilities and Warranties.
NOTICE: The information contained in this document is subject to change without notice. Please read these Operating
Instructions before commissioning the instrument. Keep the operating instructions in a place that is accessible to all
users at all times. Please assist us to improve these operating instructions, where necessary. We are always grateful for
your suggestions.
Should any difficulties arise during start-up, you are asked not to carry out any unauthorized manipulations on the
instrument as this could affect your warranty rights! Please contact the nearest nVent subsidiary or the head office.
If any servicing is required, the instrument must be returned to the head office.
1.1 Certification
nVent certifies that this product meet its published specifications at the time of shipment from the Factory.
1.2 Warranty
This nVent product is warranted against defects in material and workmanship for a period of 12 months from the date
of installation or 30 months maximum from the date of shipment, whichever occurs first. During the warranty period,
nVent will, at its option, either repair or replace products that prove to be defective.
For warranty service or repair, this product must be returned to a service facility designated by nVent. The Buyer shall
prepay shipping charges to nVent and nVent shall pay shipping charges to return the product to the Buyer. However, the
Buyer shall pay all shipping charges, duties, and taxes for products returned to nVent from another country.
nVent warrants that the software and firmware designated by nVent for use with a product will execute its programming
instructions properly when installed on that product. nVent does not warrant that the operation of the hardware, or
software, or firmware will be uninterrupted or error-free.
1.3 Limitation of warranty
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Buyer,
Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the specifications for
the product, or improper installation.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. NVENT DISCLAIMS THE IMPLIED ARRANTIES OF MERCHANTA
BILITY AND FITNESS FOR A PARTICULAR PURPOSE.E.
1.4 Exclusive remedies
THE REMEDIES PROVIDED HEREIN ARE THE BUYER’S SOLE AND EXCLUSIVE REMEDIES. NVENT SHALL NOT BE LIABLE
FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT,
TORT, OR ANY OTHER LEGAL THEORY.
1.5 Statement of compliance
This equipment has been tested and found to comply with the low voltage directive 2006/95/EC and the electromagnetic
compatibility directive 2004/108/EC. These limits are defined to provide reasonable protection against harmful
interference in a residential installation (technical data mentions industrial application). This equipment generates uses
and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more
of the following measures:
• Reorientate or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

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1.6 Area of use
nVent RAYCHEM NGC-40-SLIM limiters are used for temperature limiting of electrical heaters in industrial and potentially
explosive atmospheres. The NGC-40-SLIM is a safety temperature limiter. NGC-40-SLIM units are approved for use in
non-hazardous areas. Where needed the temperature sensor of the unit can be placed in Zone 1, Zone 2, Zone 21 and
Zone 22 when the sensor is hazardous area approved.
1.7 Safety instructions
During operation, do not leave this Instruction Manual or other objects inside the enclosure. Use the limiter only for its
intended purpose and operate it only in clean, undamaged condition. Do not make any modifications to the temperature
controller and limiter that are not expressly mentioned in this installation manual.
Whenever work is done on the temperature limiter, be sure to observe the national safety and accident
prevention regulations and the safety instructions given in this Instruction Manual.
1.8 Conformity with standards
NGC-40-SLIM units meet the requirements of the following functional safety standards and are developed, manufactured
and tested in accordance with state-of-the-art engineering practice.
Title Comment Standard Explanation
Electro Magnetic
Compatibility
Complies to
applicable EU
directives
EN-61326:2002 Interference emission: Class B, immunity to
interference: to Industrial requirements
New Approach Directives Harmonized Standards
Electrical Safety Low Voltage
Directive (LV)
Test voltages according
to
EN 60730-1 table 13.2
EN 60730-1 Automatic electrical controls for
household and similar use – Part 1: General
requirements
Low Voltage
Directive (LV)
EN61010-1:2004 Safety requirements for electrical equipment for
measurement, control and laboratory use –
Part 1: general requirements
2004/108/EC Electromagnetic
compatibility (EMC)
EN61000-6-3:2006
EN61000-6-2:2005
EN55011:2007
EN61010-1:2004
Vibration IEC 60068-2-6 Edition
7.0 2007-12
Frequency 10-55 Hz,@ 0.35MM(0 – Pk),Sweep
Rate: 1O ct/Min, Total: 10 Sweep Cycles/Axis,
Duration: 49Min/Axis
Shock IEC 60068-2-27 Edition 4
2008-02
Acceleration 50 g, half sine-wave, 11 msec
duration 3 pulses in 6 directions
Table 1: Standards overview

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1.9 Approvals and certifications
IECEx Markings:
IECEx ETL17.0062X
Ex ec nC IIC T4 Gc
ATEX Markings:
ITS17ATEX402833X
II 3 G Ex ec nC IIC T4 Gc
(Russia, Kazakhstan, Belarus)
For other countries contact your local nVent representative.
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-SLIM 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.
2 TECHNICAL DATA
2.1 Product Description
The NGC-40-SLIM module is used as safety temperature limiter within the NGC-40 control and monitoring system. The
module has one output for the contactor, one alarm output and one digital input. The alarm output can be used to control
an external annunciator. The digital input can be used for resetting the limiter remotely. The module has 3 temperature
inputs which can be used all in case of a three phase heat-tracing system. The limiter is equipped as smart limiter where
the current measurements are done in the associated controller. The front panel of the SLIM module has LED indicators
for various status conditions.
The front panel also provides “Set Config”, “Trip Reset” and “Alarm Reset” buttons.
2.1.1 Tools Required
• Small flat-blade screwdriver
2.1.2 Additional Materials required
• Power supply 24 Vdc @100 mA per NGC-40-SLIM, CE Certified
• Custom built CAN cables with RJ-45 connections
• CAN Bus Termination Block (part nr.: 10392-043)
2.1.3 Kit Contents
Item Quantity Description
NGC-40-SLIM 1 Safety Temperature Limiter
INSTALL-171 1 NGC-40-SLIM installation instructions
2.1.4 General information
• Supply voltage 24 Vdc ± 10%
• Internal power consumption < 2.4 W per NGC-40-SLIM module
• Ambient operating temperature 0˚C to 65˚C (32˚F to 149˚F)
• Ambient storage temperature –55˚C to 75˚C (–67˚F to 167˚F)
• Environment PD2, CAT III
• Max. Altitude 2,000 m (6,562 ft)
• Humidity 5 – 90% non condensing
• Mounting Din Rail – 35 mm
2.1.5 Measuring range
Temperature range limiter from +70˚C to +500˚C (158˚F to 932˚F)

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2.1.6 Electromagnetic Compatibility
2.1.6.1 Emissions
EN 61000-6-3, Emission standard for residential, commercial and light industrial environments
2.1.6.2 Immunity
EN 61000-6-2, Immunity standard for industrial environments
2.1.7 Temperature Sensors
Type: 100 Ω platinum RTD, 3-wire, α = 0.00385 ohms/ohm/˚C. Can be extended with a 3-conductor shielded cable of 20 Ω
maximum per conductor
Quantity: 3 per NGC-40-SLIM module
2.1.8 Alarm Relay
Dry contact relay (voltage free). Relay contact rated 250 V / 3 A, 50/60 Hz (CE). Alarm relay is programmable. N0 or NC
can be configured.
2.1.9 Contactor Output Relay.
Relay contact rated 250 V / 3 A, 50/60 Hz (CE)
2.1.10 Digital Input
Digital input is used for resetting the safety temperature limiter remotely.
The Digital Input will be for connection to external dry (voltage free) contactor or DC voltage. The input would be 5 – 24
VDC/1 mA max with 100 ohms of loop resistance and configured as active low.
2.1.11 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, terminate with TTC, CAN termination block (see Figure 8).
• Cable length: 10 m (33 ft) maximum
• Quantity: Up to 80 modules per network segment
• Address Unique, factory assigned
2.1.12 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 outputs
• Form-A 250 Vac/3 A dry contact (voltage-free) alarm relay, programmable for steady or flashing on alarm.
• Form-A 250 Vac/3 A contactor coil drive relay. This output is used in conjunction with the terminals to provide
switched LINE voltage to an external contactor coil.
2.1.13 NGC-40 Safety Limiter
Product name: NGC-40-SLIM
Part number: 1244-010700
2.1.14 NGC-40-SLIM accessories and associated components
Product name Part number
NGC-40-HTC 10730-003
NGC-40-HTC3 10730-004
NGC-40-IO 10730-001
NGC-40-BRIDGE 10730-002
NGC-40-PTM 10730-005
MONI-RMC-PS24 972049-000

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2.1.15 Dimensions
NGC-40 SAFETY TEMPERATURE LIMITER
STATUS
NETWORK
CURRENT
TS1
RESET
TS2
TS3
TRIP
ALARM
RESET
TRIP
RESET
SET
CONFIG
87
45.1
87
45.1
45.1
106.4
45.1
106.4
C
D
A
B
A: WIRING TERMINALS
C: RESET
D: STATUS LEDS
Front Top Bottom Back
Figure 1: Dimensions NGC-40-SLIM module
A: WIRING TERMINALS:
Term Limiter Module
1 Output relay
2 Output relay
3 Alarm relay
4 Alarm relay
5 --
6 TS1 common
7 TS1 sense
8 TS1 source
9 TS2 common
10 TS2 sense
11 TS2 source
12 TS3 common
13 TS3 sense
14 TS3 source
15 Digital In +
16 Digital In -
Table 2: Wiring terminals
A: WIRING TERMINALS
B: CAN BUS/MODULE POWER
C: RESET
D: STATUS LEDS

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State LED
Status Network Current TS 1 TS 2 TS 3 Trip
OFF No Power No current No alarm No alarm No alarm Not Tripped
RED Device-reset
alarm is active
Tripped
GRN Normal
operation, no
internal faults
Flicker on
receipt of CAN
packet
Current
YEL In Boot Loader
mode
Flicker on
transmission
of CAN packet
Flash RED Internal Fault:
• Lost
calibration
TS 1sensor
failure alarm
TS 2 sensor
failure alarm
TS 3 sensor
failure alarm
Flash GRN
Flash YEL Tripper and
non-latching
Flash RED/
GRN
Factory unlock /
un-calibrated
Flash RED/
YEL
Flash YEL/
GRN
Table 3: LED status of NGC-40-SLIM module
Note: For the SLIM module, when ALL LEDs are flashing red, the unit has lost factory calibration, cannot be
communicated with, and must be returned to the factory for repair/replacement.
2.2 Mounting and wiring NGC-40-SLIM module
Mounting the NGC-40-SLIM
2
1
2
1
Each NGC-40-SLIM mounts on a DIN35 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,
than rotate the module toward you.
Figure 2: Mounting NGC-40-SLIM module onto DIN rail

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Power Supply/CAN
The power supply/CAN connector is an RJ-45 connector
Cable from
another module or
power supply
CAN termination
here if last one in
chain
The CAN termination device must be installed
in the unused port of the last module.
NGC-40 SAFETY TEMPERATURE LIMITER
STATUS
NETWORK
CURRENT
TS1
RESET
TS2
TS3
TRIP
ALARM
RESET
TRIP
RESET
SET
CONFIG
NGC-40 SAFETY TEMPERATURE LIMITER
STATUS
NETWORK
CURRENT
TS1
RESET
TS2
TS3
TRIP
ALARM
RESET
TRIP
RESET
SET
CONFIG
Sensor 1 Sensor 2 Sensor 3
Common
(white)
6 9 12
Sense (red) 7 10 13
Source (red) 8 11 14
Figure 3: Power via CAN cable connector
Figure 4: Temperature sensor connections to terminals
Figure 5: Contactor terminals
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.
Contactor Relay
Contactor relay uses terminal 1 and 2, Form A, NO dry contact,
rated at 250 Vac max, 3 A.
Contact is energized & closed during normal conditions and will
open upon an trip or power failure condition.
RTD Terminals

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NGC-40 SAFETY TEMPERATURE LIMITER
STATUS
NETWORK
CURRENT
TS1
RESET
TS2
TS3
TRIP
ALARM
RESET
TRIP
RESET
SET
CONFIG
NGC-40 SAFETY TEMPERATURE LIMITER
STATUS
NETWORK
CURRENT
TS1
RESET
TS2
TS3
TRIP
ALARM
RESET
TRIP
RESET
SET
CONFIG
Figure 6: Alarm terminals
Figure 7: Trip reset digital input
Alarm via Digital Output
Alarm relay using terminal 3 and 4,
Form A, NO dry contract, rated at 250 V max, 3 A.
Contact is energized & closed during normal conditions
and will open upon an alarm condition.
Trip reset (Digital Input)
Terminal 15 and 16.
100 Ω max loop resistance or 5-24 Vdc @ 1 mA maximum

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Power/
Termination
Module
CAN/Tem CAN/24 Vdc
Primary Supply*
24 Vdc
20 modules
per Power Supply
+
–
Redundant
Supply*
24 Vdc
20 modules
per Power Supply
+
–
Bridge
Module
80 Modules
per bridge
Module 1
CAN / 24 Vdc
CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc
IN OUT
HTC/HTC3
or
I/O
or
SLIM
Module 2
CAN / 24 Vdc
IN OUT
Module 3
CAN / 24 Vdc
IN OUT
Module 4
CAN / 24 Vdc
IN OUT
Module 10
CAN / 24 Vdc
IN OUT
Termination
Block
Termination
Block
Optional redundant supply
100-240 Vac In
100-240 Vac In
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
* Power supply shall have a means for disconnect from line voltage
NGC-40 CAN Bus Connections for up to 10 Modules
Power/
Termination Module
CAN/Tem CAN/24 Vdc
Primary Supply*
24 Vdc
20 modules
per Power Supply
+
–
Redundant Supply*
24 Vdc
+
–
Bridge
Module
80 Modules
per bridge
Module 1
CAN / 24 Vdc
CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc
IN OUT
HTC/HTC3
or
I/O
or
SLIM
Module 2
CAN / 24 Vdc
IN OUT
Module 3
CAN / 24 Vdc
IN OUT
Module 4
CAN / 24 Vdc
IN OUT
Module 10
CAN / 24 Vdc
IN OUT
Termination
Block
Optional redundant supply
100-240 Vac In
100-240 Vac In
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
* Power supply shall have a means for disconnect from line voltage
NGC-40 CAN Bus Connections for up to 20 Modules
Bridge
Module
80 Modules
per bridge
Module 1
CAN / 24 Vdc
CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc
CAN / 24 Vdc
CAN / 24 Vdc CAN / 24 Vdc
IN OUT
HTC/HTC3
or
I/O
or
SLIM
Module 2
CAN / 24 Vdc
IN OUT
Module 3
CAN / 24 Vdc
IN OUT
Module 4
CAN / 24 Vdc
IN OUT
Module 10
CAN / 24 Vdc
IN OUT
Termination
Block
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
Power/
Termination Module
CAN/Tem CAN/24 Vdc
Figure 8: CAN network connections for up to 10 modules
Figure 9: CAN network connections for up to 20 modules

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* Power supply shall have a means for disconnect from line voltage
NGC-40 CAN Bus Connections for up to 40 Modules
Power/
Termination Module
CAN/Tem CAN/24 Vdc
Primary Supply*
24 Vdc
20 modules
per Power Supply
+
–
Redundant Supply*
24 Vdc
+
–
Bridge
Module
80 Modules
per bridge
Module 1
CAN / 24 Vdc
CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc
IN OUT
HTC/HTC3
or
I/O
or
SLIM
Module 2
CAN / 24 Vdc
IN OUT
Module 3
CAN / 24 Vdc
IN OUT
Module 4
CAN / 24 Vdc
IN OUT
Module 10
CAN / 24 Vdc
IN OUT
Termination
Block
Optional redundant supply
100-240 Vac In
100-240 Vac In
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
Bridge
Module
80 Modules
per bridge
Module 1
CAN / 24 Vdc
CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc
CAN / 24 Vdc
CAN / 24 Vdc CAN / 24 Vdc
IN OUT
HTC/HTC3
or
I/O
or
SLIM
Module 2
CAN / 24 Vdc
IN OUT
Module 3
CAN / 24 Vdc
IN OUT
Module 4
CAN / 24 Vdc
IN OUT
Module 10
CAN / 24 Vdc
IN OUT
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
Power/
Termination Module
CAN/Tem CAN/24 Vdc
Power/
Termination Module
CAN/Tem CAN/24 Vdc
Primary Supply*
24 Vdc
20 modules
per Power Supply
+
–
Redundant Supply*
24 Vdc
+
–
Bridge
Module
80 Modules
per bridge
Module 1
CAN / 24 Vdc
CAN / 24 Vdc
CAN / 24 Vdc
CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc
IN OUT
HTC/HTC3
or
I/O
or
SLIM
Module 2
CAN / 24 Vdc
IN OUT
Module 3
CAN / 24 Vdc
IN OUT
Module 4
CAN / 24 Vdc
IN OUT
Module 10
CAN / 24 Vdc
IN OUT
Optional redundant supply
100-240 Vac In
100-240 Vac In
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
Bridge
Module
80 Modules
per bridge
Module 1
CAN / 24 Vdc
CAN / 24 Vdc CAN / 24 Vdc CAN / 24 Vdc
CAN / 24 Vdc
CAN / 24 Vdc CAN / 24 Vdc
IN OUT
HTC/HTC3
or
I/O
or
SLIM
Module 2
CAN / 24 Vdc
IN OUT
Module 3
CAN / 24 Vdc
IN OUT
Module 4
CAN / 24 Vdc
IN OUT
Module 10
CAN / 24 Vdc
IN OUT
Termination
Block
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
HTC/HTC3
or
I/O
or
SLIM
Power/
Termination Module
CAN/Tem CAN/24 Vdc
Figure 10: CAN network connections for up to 40 modules
The location of the SLIM module is free to choose after the bridge module. Via configuration tools the limiter will be
linked to the associated controller.

nVent.com/RAYCHEM | 13
Functional Safety Limiter block diagram
Limiter
Inputs
Temperature
Input 1
Temperature
Input 3
Temperature
Input 2
Temp 1
Comparison
Temp 3
Comparison
Temp 2
Comparison
Limiter
Latching Limiter
LEDs
Limiter main support circuitry including processor
Limiter
Output
Limiter
Relay
Output
Limiter
Setpoint
Figure 11: Safety Temperature Limiter block diagram
3.3 Temperature limiter (schematic)
3 SAFETY INSTRUCTIONS FOR NGC-40-SLIM
3.1 Area of use
Safety temperature limiters are required in all areas where thermal processes need to be prevented from overheating,
and where the system must be set to a safe operating condition in the event of a fault.
Typical examples of such installations could be surface heating installations in Hazardous area Zone 1
3.2 Safety function of temperature limiter in NGC-40-SLIM
The safety function will invoke, when the permissible temperature limit is reached or in case a fault occurs (such as
probe break, probe short-circuit, component failure, or supply failure) even when the process conditions are within the
permissible temperature range. In all these cases the equipment is immediately switched off. If the fault is no longer
present, than the safety temperature function must be manually reset before the unit goes back to normal operation.
NGC-40-SLIM units can be reset by means of a Trip Reset push button, an external hardwired signal or via dedicated
software. The output of the unit will only be enabled when all conditions are safe; meaning that the temperature
measured by the limiter RTD has dropped below the limiter set point and when there are no other faults being detected.
In other words, the unit will only reset after the normal operating conditions have returned.

14 | nVent.com/RAYCHEM
Figure 12: “Trip Reset” button
3.4 Reset Safety Temperature Limiter
The safety temperature limiter is designed such that after the temperature limiter has tripped the device needs to be
reset manually. Resetting is possible only after the normal, safe operating conditions have returned. In order to RESET
the limiter after it has tripped, the user needs to press the Trip Reset pushbutton as is shown in Figure 12. Alternatively
the safety temperature limiter can be reset via nVent RAYCHEM Supervisor, nVent RAYCHEM TOUCH 1500. Refer to the
operating manual of the specific units for more detailed instructions on how to use these devices.
3.5 Temperature setting secured and locked to prevent manipulation
The lock out temperature (set point) of the safety temperature limiter must be set in such a way that maximum T-class
temperature cannot be exceeded. The surface temperature of the heat-tracing cables is limited to the temperature
applicable in this T class -5 K for temperatures below or equal to 200°C or –10 K for temperatures greater than 200°C.
Refer to section 3.7 below for the procedure to change the safety limiter set point. The safety temperature limiter
operates totally independent of the temperature control system and has its own temperature inputs (RTD Limiter).
In case of a defect to any part of the NGC-40-SLIM unit the device shall be de-energized before replacing the defective
equipment.
3.6 Changing limiter set point
Changing the set point of the limiter requires the combination of the SET CONFIG button on the SLIM and an external
user interface.
3.7 Procedure to write new temperature set point to limiter
In order to write a new set point to the safety temperature limiter a safety procedure needs to be followed. Changing
the set point of the temperature limiter requires the combination of the limiter “Set Config” button and a programming
device. For a programming device one can use Supervisor software or the TOUCH 1500.
The procedure to change the limiter set point is the same for all user interfaces. The configuration software will write the
new set point to the input buffer of the NGC-40-SLIM controller only when the “Set Config” button is pressed. The limiter
set point button needs to be activated within a certain time after the buffer has been loaded with the new set point.
If the button has not been pressed before the programming window is elapsed, the buffer will be emptied and the old
value remains unchanged. Once the new set point has been written the new, or in case the write procedure was not
successful, the old set point will be read back by the programming device as confirmation to the user. After changing
the limiter set point the user shall verify whether the set point has been updated correctly. Each time after the limiter set
point has been altered a functional test as per paragraph 3.9 should be performed.
3.8 Test in the event of a fault
In the event of a system fault, the limiter switches off the load. This condition is indicated by the LED “TRIP” which will
light up. The fault is signalled simultaneously by the alarm relay which changes state. Press the “TRIP RESET” button
(at least 2 sec) until the limiter tripped LED is off. If the safety circuit remains open, the system and the RTD circuit have
to be checked.
Press the “TRIP RESET” button again. If the limiter remains inhibited after pressing the reset button the unit should be
replaced.
NGC-40 SAFETY TEMPERATURE LIMITER
STATUS
NETWORK
CURRENT
TS1
RESET
TS2
TS3
TRIP
ALARM
RESET
TRIP
RESET
SET
CONFIG

nVent.com/RAYCHEM | 15
3.9 Safety related system characteristics
The failure types of; sensor break, sensor short, sensor misconnected and random hardware failure are permanently
monitored.
IMPORTANT NOTICE
In case a failure of the safety system is detected either during operation or during routine maintenance when executing
a function test the unit should be switched off and taken out of service. Defects in the safety system cannot be repaired
in the field. Defective units are to be replaced and returned to the manufacturer for investigation. Please contact your
nearest nVent representative for more instructions. A list of worldwide representations can be found on the last page of
this document or on www.nVent.com.

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