Lievers HFO/E User manual

HD HFO Upgrade
Instruction Manual
Sept 2021 1
model: HFO/E 2,5kVA 230V
Applies to serial numbers:
CF14694 –DF15091

SURVEY
Sept 2021 4
Model: HFO/E 2,5kVA 230V
Condition: The inverter has to be used at maximum load in a higher ambient temperature.
Symptoms: Inverter might stop after approximately 45 minutes.
After some time the inverter starts again when switching On.
Causes: Electronic inverter measures a too high temperature. (protection mode will be activated)
Insufficient aircooling inside inverter housing.
Solution: Improve air flow inside yellow housing.
Adaptions: Create air inlet holes on bottom side.
Place protective strip
Add cooling fan.
Materials: Replacement panel with hole for cooling fan. (available in kit. No. 145400)
Protective strip to cover air inlet holes
Tools: Screwdrivers: Ph2 / Slotted 8mm / Wrench 13

1) Position the inverter on it’s back side.
2) Unscrew the 4 bolts out of the rubber dampers on the bottom side and remove the outside frame.
3) Put the housing back on right and remove the screws of the housing U-shape cover plate and open the housing.
4) Disconnect the following wires from the inverter:
Input AC power L1+L2
Output power U + V + W
Ground wire
5) Detach the inverter and take it out.
6) Dril 5 holes in the bottom of the housing according drawing.
6) Detach the separation panel between inverter and transformer.
7) Replace the panel with the modified one with cooling fan.
8) Mount the inverter again and connect the mains supply L1 and L2 and the wires to the transformer
at the U, V and W terminal.
9) Connect the red wire from the ventilator to the P24 terminal and the black one to CM terminal.
10) Place all plastic covers back again to the inverter.
11) Perform a function test of inverter and check if blower is working. If yes.
12) Close metal housing of inverter.
Sept 2021 3
Working Instruction

Sept 2021 4
Working Instruction Visuals
12
3
1) Separation panel
2) 5 air inlet holes
3) Connection of cooling fan
4) Mount holes cover
4