Danfoss DLX 4.6 Betriebsanweisung PDF herunterladen (Seite 80)

80 User Guide DLX Series L00410623-1

Figure 8.2.4: Heat sink cleaning

• Vacuum cleaner

• Soft brush

• Compressed air

8.2.7. Fan

The fan circulates the air inside the inverter, which distributes heat and thereby maintains

the conversion capacity. The replacement of the fan requires removal of the inverter upper

cover and must be performed by Danfoss authorized service personnel only!

• A message is shown in the display when the fan needs replacement. Refer to 7.2. Table of

Events.

• If the fan fails, the inverter continues to feed the maximum amount of power available

until a certain high temperature threshold, at which point it starts to reduce power to

protect itself against overheating.

8.2.9. Varistors (VDR)

Varistors have a finite life expectancy, and therefore need regularly inspections (at least

once per year). When exposed to transients they degrade and lose their protective

function and need to be replaced. The replacement requires removal of the inverter lower

cover and the use of the VDR service tool, and must be performed by qualified personnel

only!

8.2.9.1. DC Side

• A message is shown in the display when a DC varistor needs replacement. Refer to 7.2.

Table of Events.

• Replace the damaged varistor with LX Varistor Kit ordered from your local Danfoss

representative, part number 139B0570.

• The two varistors on the DC side are located above the network connection on the left

side of the customer connection area.

• Note the orientation of the varistors if they need to be replaced.

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Danfoss DLX 4.6 Betriebsanweisung Seite 80