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User Guide
Burning procedure
Preparations
1.
Choose a mains outlet to supply the HVU.
2.
Disconnect all other equipment which are
connected to the supply line of that outlet.
3.
Connect the HVU to the mains outlet.
4.
Switch OFF the HVU.
5.
Disconnect the heating cable from the controller /
thermostat.
6.
Connect heating cable to the sockets of the
HVU outlet cables. Make sure that other cable
terminals (e.g. the floor sensor cable) will not
touch the HVU outlet terminals. Generally, the
optimal pair of conductors of a screened twin
heating cable is the pair exhibiting the lowest
resistance.
7.
Insert safety key.
Burning
8.
Switch ON the HVU. The HVU initializes through
the Start menu and enters the Main menu.
9.
Select the Setup menu if you want to use the
Autostop current feature.
• Select Set menu and enter the desired Autostop
current allowed through the carbon bridge, e.g.
1.20 A.This setting will stop the burning process
when the chosen current has been obtained.
The Autostop current will protect the insulation
material against a too violent burning which
ultimately may destroy the carbon bridge. An
Autostop value of 0,00 Ampere indicates no
Autostop current and you will have to stop the
burning process manually.
• Exit to the main menu by choosing the Back
menu.
10. Select the Burn menu.
11. Select "HVon" and activate (the circular indicator
in the display is highlighted). The role of the HV-
pulse is to "shoot" through the insulation thus
paving the way for the DC current.
BC421332622232fr-FR0101
DEVItector™ II V2
12. Select menu "DC" and activate (highlight the
circular indicator in the display). The role of the DC
current is to form the carbon bridge.
13. Select "Start" and activate by pressing and releasing
the knob and then press and hold the safety button
during the burning process. Clicks of the relay will
be heard. Pulses of high voltage, 10 kV, will be sent
to the heating cable and lead to a breakdown/short
circuit" of the cable's faulty section.
14. To build-up the carbon bridge, increase the DC
voltage by turning the knob stepwise. You may
at any time pause the burning operation by
releasing the safety button.The burning will stop
once the Autostop current has been reached. If
you have not activated the Autostop current, you
will have to observe the current shown in the
display until a desired value has been reached.
If the current does not settle but varies between
zero and a higher value, do increase the voltage
one step further. When it does settle, stop the
burning by pressing the knob. You are now back
in the Main menu.
15. Check the stability of the carbon bridge by the
following procedure: Leave the HVon disabled, do
enable the DC voltage and start burning. Turn the
knob to achieve 100 V and observe if the current is
of the magnitude 0,5 A or higher, that is the carbon
bridge has a resistance of 200 Ohms or less.
Note: If water has entered the heating cable, the
burning of a carbon bridge may last considerably
longer, say 10–20 minutes.
16. If the carbon bridge turns out to be unstable it is
necessary to repeat all operations from step 9, 10.
17. After reaching a stable burning current, stop
pressing the Safety Button to stop the burning.
18. Select menu "Back" of the burn menu to reach the
main menu.
19. Switch OFF the device.
2022.07 | FEC | ©Danfoss | 21
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