Operation; Fault Rectification - Maico DAD 63/4 Montage- Und Betriebsanleitung

15 Operation

3. Check power consumption. Ensure that the
power consumption does not exceed the value
stated on the fan's rating plate. With a star-
delta connection, read off the value upstream
of the changeover switch.
4. Avoid higher switching frequencies because
they may result in permanent fan overload and
overheating. Allow the motor to cool suffi-
ciently before restarting.
5. After the first few operating hours, check the
bearing temperatures because these are the
most critical. If the bearing temperatures are
too high, interrupt operation if required and re-
start once they have cooled down. The operat-
ing temperatures must then be lower.
6. The fan impellers are balanced in accordance
with ISO 14694 "Industrial fans – Specifica-
tions for balance quality and vibration levels"
and ISO 1940-1.
In addition to this, run a vibration check on
site. Check the vibration values after commis-
sioning (ISO 14694, BV-3, Veff 4.5 mm/sec.)
Retrofit components for avoiding vibration if
necessary. Before installation, check the ap-
plication category of the fans and the vibration
limits for on-site tests, in particular for the
start-up, alarm and stop operating statuses.
7. After several operating hours, check that the
vibrations have not caused the screws to
come loose.
15 Operation
Read up on the command equipment
needed for starting, stopping, emergency
stops or resetting after an emergency stop.
Provide these in accordance with the planning
documents and relevant regulations
(EN 60204-1, EN 14118, EN 14119, EN 14120).
Regularly check that guards are fully func-
tional. Ensure that they are working properly.
Do not store flammable objects in the vicin-
ity of the installation site. Note the fire pre-
vention requirements.
Do not cover the fan during operation.
There is a danger of fire.

16 Fault rectification

Troubleshooting and repairs only permiss-
ible when carried out by qualified electricians.
Observe enclosed safety instructions.
1. Use the inspection switch to switch the fan
Off/Aus and fit a padlock to make sure it isn't
switched on again.
2. Wait until the fan has cooled down sufficiently
and the impeller is stationary before removing
the weather protection hood or any other pro-
tection against accidental contact or touching
the fan.
3. Remove the weather protection hood.
4. Lock the impeller so that it cannot move any
more. This protects you from unforeseen
rotary movements, such as those which may
be caused by air flows in the ventilation chan-
nel.
Fan does not switch on/does not run.
Cause 1: No mains voltage, earth fault.
Measure: Check whether the power supply is
guaranteed (mains fuse, service switch, motor
connection).
Cause 2: Wiring not carried out correctly.
Measure: Check wiring → connection wiring dia-
gram.
Cause 3: Thermal motor protection has triggered
(motor is overheated).
Measure: Ensure that the air ways are free, re-
move foreign objects if necessary. Check room
temperature. Check voltage. If necessary, install
air filter in duct system.
Cause 4: The impeller is blocked or dirty.
Measure: Remove foreign objects or dirt.
Fan runs too slowly / volumetric flow too low
Cause 1: Impeller is rubbing
Measure: Remove foreign objects or dirt.
Cause 2: Deposits on the impeller and in the
housing caused by dust in the air.
Measure: Install air filter in duct system. Ensure
that air ways are free.
Cause 3: Air ways blocked.
Measure: Check that the air ways are free (sup-
ply/exhaust shutters, protective grille, filter).
Vibrations/unusual noises
Cause 1: Imbalance, impeller rubbing
Measure: Check impeller for damage, dirt or
icing. Remove foreign objects and deposits on the
impeller and in the housing. Ensure that air ways
are free.
Cause 2: Bearing faulty/worn.
Measure: Replace unit.
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