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User Guide
8. Burning and Tracing
When the cable fault is a disruption or a weak
connection (high resistance), the burning procedure
should be followed.
WARNING
Hazardous voltage on terminals. Keep hands
away from terminals and connected cable.
WARNING
If the heating cables are not completely covered
by non-flammable materials such as sand or
concrete, and close to flammable material, cable
burning procedure should be undertaken with
great caution as the heating cable will burst into
open flames at the fault location.
WARNING
Burning can produce smoke – secure ventilation
of the room.
Fig. 22: Photo of HVU-treated heating cable installed
in open air on sand
20 | ©Danfoss | FEC | 2022.07
DEVItector™ II V2
Overload protection
The DEVItector™ II V2 unit has several built-in overload
protection modes.
Burning mode
A software-controlled reversible thermofuse monitors
two power resistors. If their temperature exceeds 75 °C
the display will show the message "Power Resistors
Overheated" and you will have to let the HVU cool
down for several minutes before proceeding.
Note: Do not switch power OFF when HVU is cooling
down because of possible work of fans.
The temperature sensor itself is monitored. If it should
disconnect, the display will show the message "NTC
disconnected". If it is shorted, the display will show
"NTC shorted". In both cases, authorized repair will be
needed.
The DC voltage is limited by software to yield a
maximum of 3A current. The limiting is automatic and
requires no user intervention.
Resetable thermo fuses
If DEVItector™ is in Burning mode and does not
produce sparks the resettable thermo fuse could be
OFF. The thermo fuse will automatically restore On
condition after approx. 10–20 min.
Note: Do not switch power OFF when HVU is cooling
down.
BC421332622232es-ES0101
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