Advice, Fault Messages And Servicing - nVent RAYCHEM VIA-DU-20 Mode D'emploi

5. ADVICE, FAULT MESSAGES AND SERVICING

EN
5.1 What to do during set up
When the device is first put into operation it carries out an auto-test. During this test the display indicates, "POWER-
DE
UP TESTS". If the device finds a fault during this test, it displays a number on the second line of the display.
FR Otherwise the device goes into the standard operating mode.
IT
* This parameter is indicated only when "local detection" is selected.
RU
If a fault is identified, you should carry out another test by switching the device off and on again. If the fault message
is displayed again, the device is faulty and must be replaced.
If the fault message is displayed indicating the number '6', perhaps one of the buttons is stuck. In this case, the
keyboard must be checked. Then switch the device off and on again for another test.
5.2 What to do in the event of a loss of power
If there is a loss of power, all parameters will remain saved in the memory. Both relays (heating and alarm) will stop
working.
After the power failure, the device will continue to operate in its state when the power loss occurred. The timers will
remain constant during power loss (no reserve power supply).
5.3 Sensor monitoring
The ground temperature and moisture sensor and the air temperature sensor are monitored for faults (breakage and
short circuits) by the control device. If a fault occurs, the alarm relay switches and the display indicates, "SENSOR
FAULT" and a corresponding fault message is emitted. The following fault messages are used:
Display
SHORT GROUND TMP
OPEN GROUND TMP
MOISTURE
SHORT AIR TMP
OPEN AIR TMP
SHORT SENSHEATER
OPEN SENSHEATER
A failure will interrupt heating times, such as the post-heating period. The heating output will be turned on or off as
set under the parameter "IN THE CASE OF FAILURE HEATING..."
* The monitoring of air temperature is only active when "local detection" is selected.
5.4 Trouble shooting
Symptoms
Heating is on, but there
is no moisture
The device shows
moisture 0, while
sensor is moist
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8 nVent.com/RAYCHEM
Type of fault
Ground sensor short circuit
Ground sensor interrupted
General fault in the moisture measurement device. Possible faults: there are conductive objects
touching one or both sensors or the control device input is faulty.
Short circuit in the air temperature sensor*
Interruption of air temperature sensor*
Short circuit in the sensor heating (is recognised if the temperature of the ground sensor
remains below +2°C for longer than 2 hours)
Sensor heating interrupted
Probable
Setting overruling
BY BMS is selected
Setting moisture threshold OFF is selected
The device has detected a temperature drop
and heating is on for post heating period
The sensors surface it soiled (oily)
The moisture on the sensor is frozen
Correction
If necessary change settings
If necessary change settings
This is normal operation
Clean the surface of the ground sensor with a flannel
and water. The surface of the sensor must not be
scratched with sharp objects.
Set the temperature threshold to a higher value. This
gives a higher set point for sensor heating, too.