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IOM_ACVIBA HE_35ia80i_207910_190501_EN
ACVIBA HE
AIR-AIR PACKAGED UNITS
COMPACT VERTICAL INVERTER
OPERATION
EC motor fans
Diagnosis / Failure
Type of
failure
Possible cause
Solution
Fan does
not run
(anymore)
Failure line voltage. Failure of one phase.
Under
– or overvoltage.
Check line voltage.
Earth fault.
Check motor connection and line voltage.
Short circuit winding.
Replace fan.
The thermal protection of the motor has
triggered (motor is overheated)
Check for free air way; remove foreign bodies if necessary "Impeller
blocked or dirty". Check temperature of supply air. Check voltage.
Impeller blocked or dirty
Switch off power to the motor and secure against switching back
on.
Check safe isolation from supply.
Remove safety grille.
Remove foreign bodies or soiling.
Remount the safety grille.
Fan will not
start
Temperature too low for bearing grease.
Insert bearing with cold greasing.
Air stream wrong direction (Motor turns in
wrong direction at high speed)
Check air stream.
In case of very strong air stream, the fan might not be able to start.
Fan turns
too slowly
Impeller / blade scrapes / brushes.
When indicated clear foreign bodies / dirt from the fan.
Active temperature management effective
(Motor or electronics over-heated).
Check for free air ways; remove foreign bodies if necessary. "Impeller
blocked or dirty". Check temperature of supply air. Check installation space
(air speed overheat sink).
Air flow too
low
Fan turns too slowly
Check “Fan turns too slowly”.
Airways blocked
Check for free air ways (supply/exhaust air vents, filters) “Impeller blocked
or dirty”
Pressure loss different to planned.
Check fan selection.
Vibrations
Imbalance.
Check blades for damage, soiling or ice. “Impeller blocked or dirty”
No or wrong vibration dampers (only in
radial)
Install correct vibration dampers
Unusual
noises
Bearing damaged / worn.
Change bearings
.
With the motor size 055“(Z” / “B” with cross flow), replace the fan.
Impeller / blade scrapes / brushes.
When indicated clear foreign bodies / dirt from the fan. “Impeller blocked or
dirty”
Operation beyond stall point (for axial fans)
Check for free air ways (supply / exhaust air vents, filters)
Wrong overlap on nozzle ( for centrifugal
fans)
Observe the installation instructions.
OPERATION
V
ENTILADORES
EC
