Danfoss DEVIpipeguard EX Operating guide

Self-limiting heating cables - DEVIpipeguard EX

Installation Guide

Self-limiting heating cables - DEVIpipeguard EX

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DEVI

VIIWB302

Installation Guide		Self-limiting heating cables - DEVIpipeguard Ex
	Table of Contents
1	Receipt of Goods		2
2	Storage		2
3	Length of Heating Circuit		2
4	Protective Measures		3
5	Installation Instructions		3
6	Test and Commissioning		4
7	Operation and Maintenance:		4

1	Receipt of Goods

After receipt of the goods check the cables and the accessories and compare with the data on the delivery note to ensure that the correct material was supplied.

Attention: Ensure that the data sheet has been supplied. The data sheet is necessary for a correct

2 Storage

installation. The installation is not to be done without presence of the data sheet.

Hazardous Area applications: Ensure that the corresponding approval certificates are supplied. The number of the certificate must be according to the number printed on the heating cable.

The goods have to be stored in a dry place at an ambient temperature of –20 … +60°C. If a dry storage is impossible, the heating cable has to be

3	Length of Heating Circuit

closed with an end termination set. This is also necessary if a heating circuit cannot be finished at the end of a shift.

The max. allowable length of a heating circuit (according to the corresponding data sheet) for unilateral feed depends on the admissible voltage drop (we recommend not to exceed a voltage

drop of 10%) and the utilization of the circuit Breaker (recommended: 16 A CB with “C” characterization, utilization 80%)

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VIIWB302

Installation Guide		Self-limiting heating cables - DEVIpipeguard Ex
4	Protective Measures

•We highly recommend using a ground fault protection device (30mA).

•For use of the cable as trace heater according to IEC EN 62395-1 and IEC EN 60519-10 as well as for use in Hazardous Areas, a leakage current protection device (30mA) is mandatory!

•When using the heating cables on metal surfaces, they also have to be protected against indirect contact acc. to DIN VDE 100, part 410 (or equivalent standards) before operation of the system.

5	Installation Instructions

•When using the heating cable with metallic braid (protection braiding), this has to be connected to the potential earth. When using the cable without metallic braid (protection braiding), the heating system must be protected with a metallic outer sheath. This metallic sheath (pipeline or cladding of the thermal insulation resp.) has to be connected to the potential earth.

•For outdoor use of the heating cables without outer protective sheath, measurements have to be taken on site to protect the metallic sheath (protection braiding) against mechanical or chemical damage.

•Remove any sharp objects on the surface to be heated

•Clean and degrease the surface

•The installation of a heating circuit has to be carried out using original accessories acc. to the installation instructions.

Attention: Do not use adhesive tape with emollients (i.e. PVC)!

Attention: Install according to the min. bending radius and installation temperature stated on the data sheet.

An overlapping or contacting installation of the heating cable does not cause overheating due to the self-regulating heating characteristic

•The heating cable is to be fully covered (the entire length) with aluminium foil in order to prevent insulation material slipping between the cable and surface to be heated. If the insulation is covered with a metal cladding, an insulation entry kit has to be used to avoid mechanical damage of the heating cable.

•The connection and end termination of a heating circuit has to be carried out using

original DEVI accessories acc. to the DEVI termination instructions. Deviations will void the guarantee.

Attention: To avoid short circuit, do not connect the two bus wires of the heating cable to each other. Under all circumstances observe the termination and maintenance instructions for the connection and termination of the heating cables.

Hazardous Area applications: Only termination material approved by a notified body may be used with the corresponding heating cable. The required air gap and creeping distances are to be followed according to the corresponding termination instructions.

Hazardous Area applications: The free cable end is to be connected either outside the Hazardous Area or to a connection box which is approved according to a standardized type of protection.

•To save energy and to keep process temperatures constant, the application of superior control units are recommended. Please ask our project engineers when in doubt.

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VIIWB302

Installation Guide	Self-limiting heating cables - DEVIpipeguard Ex

Special conditions for safe use:

The connection method, the temperature class, and the requirements made on the qualification of the staff putting the regulations into practice, have to be defined in the certification of final installation system.

The manufacturer’s instructions must be followed.

Hazardous Area applications:

An approved safety temperature limiter is to be used to limit the sheath temperature of the heating cable to comply with maximum surface

6	Test and Commissioning

temperature as indicated in certificate EPS 14 ATEX 1743 U (80°C (T6)).

Attention: Make sure that the heating cables are never used at or exposed to temperatures above the nominal exposure temperature ratings.

Attention: When using the self-limiting heating cables in the industrial range not only the requirements of the standard DIN VDE 0100 but also DIN VDE 0721 part 1 and DIN VDE 0721 part 2A3 (or equivalent standards) have to be met.

After the completion of a heating circuit and prior to the installation of the thermal insulation, the following steps have to be taken:

•A visual check of the heating cable regarding possible mechanical damages and/or incorrect installation.

•Insulation resistance test

•The insulation resistance of each heating circuit is to be measured between each single bus wire and the metal sheath (protection braiding). The measurement values are to be noted. Test voltage: min 500 VDC, preferably 2500 VDC.

•Independent of the heating circuit length, the insulation resistance must not be lower than 20 MOhm. In case of a lower insulation resistance, the source of defect has to be determined and eliminated.

7	Operation and Maintenance:

•Check of the function of the heat circuit (only in connection with the required temperature controller and/or limiter).

•Eventual damages must be repaired/ replaced immediately. With short heating circuits, the heating cable may be replaced completely. With longer heating circuits, the defect is to be eliminated by cutting out the damaged part and replacing it by a new piece of heating cable according to the termination instructions.

•Repeat the tests after applying the thermal insulation.

Identification: Electrically heated parts have to be identified in reasonable distances with

warning labels “Electrical Heating” on the thermal insulation (approx. 5 m distance between each label on pipelines or at least 1 warning label per pipe-branch respectively.

The local laws and regulations for the use of electrical heating cables are to be followed. The permissible operating specifications stated in the data sheets (i.e. voltage, amperage, exposure temp., operating temp., IP protection classification) are to be followed accordingly.

•Self-limiting heating cables are generally maintenance free, although it is recommended that the heating cables be checked

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by qualified personnel in regular intervals for damages and insulation resistance.

•The heating cable has to be protected against damages that may occur during repair work on heated components.

•Hazardous Area applications: The opening of controllers, junction boxes and terminations are permitted only when the heating system is not under current.

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