Ultra
Assembly, installation and operating instructions
10
2.3
Risk from electrocution!
DANGER!
Risk of fatal injury from electrocution!
Contact with live parts will lead to fatal injury from electrocution. Damage to the insulation or individual
components can lead to a fatal injury.
Only permit qualified electricians to work on the electrical system.
Immediately disconnect the system from the power supply and repair it in the event of damage to the in-
sulation.
Keep live parts away from moisture. This can cause a short circuit.
Properly earth the unit.
DANGER!
Risk of fatal injury from electrocution!
Where multiple EC fans are connected in parallel, an electrical charge (>50 C) is present between line
conductor and protective earth conductor when the power is switched off. Before working on the elec-
trical connection, short-circuit the network connections and PE!
The terminals and connectors are still energised even when the unit is switched off. Use a two-pole
voltage tester to establish that the unit has been de-energised. Only open the unit 5 minutes after all
poles of the voltage have been switched off.
The protective earth carries high leakage currents (depending on the frequency, intermediate voltage and
motor capacity). Therefore, check EN-compliant earthing under test conditions (EN 50178, art. 5.2.11).
Without earthing, hazardous voltages can occur on the motor housing. In case of a fault, electrical
voltage will be present on the rotor and impeller. Rotor and impeller are base-insulated. Do not touch!
