17
CAUTION: The air flow may cause stationary parts to
move (even a fan that is switched off).
•
Remove the transport brackets. This is indicated by a
label on the door.
• Check if the fan can move freely without obstructing
the frame, flexible connection or wiring.
• Check for possible condensate/moisture. Condensate
may form in the period before the first start-up of the
AHU as a result of weather change and/or humid air
from the building. Remove all condensate from the
construction components and dry the electrical
components using warm (dry) air (e.g. with a hair
drier).This applies to both motor and frequency
converter.
• Check the connection voltage.
• Check and/or connect the motor in accordance with
local instructions and the data of the supplier.
•
Check the direction of rotation of the impeller. The
direction is indicated on the fan by an arrow.
• Separately measure the current draw of the electric
motor for all phases. The current draw of all phases
must be approximately the same and agree with the
data on the name plate. Set the motor protection
device to the nominal value.
• The motor data shown is for an altitude above sea
level of up to 1000 m and an ambient temperature of
40 °C maximum.
• The data for belt type, belt tension, number of belts,
size and type of pulley is given on a sticker on the fan
housing.
• If the fans are shut down for longer periods (longer
than three months), the bearings may be damaged. To
prevent this it is recommended, to reduce the fan belt
tension or to remove the fan belts temporarily. When
the fans are restarted the belt tension has to be reset
to the specified value. This type of damage can also
be prevented by controlled rotation of the fan impeller
This is recommended for direct-drive fans.
• Check if the flexible connection is correctly installed.
•
If used check the pressure switch and set the correct
pressure.
• Check the operation of the main switch / emergency
stop switch.
CAUTION: While working on the fan the switch has to
be locked open.
• This warning also important for safety. Because of the
positive pressure, fan doors can hit the technical
personel who is opening the doors.
•
Before openning the doors, the fan must be switched
off, isolated and allowed to rundown
(2 minutes minimum)
• The warning pictograms on rotating parts, electrical
voltage and opening doors are attached to the door.
General data, fan motor
Insulation class motor
: F
PTC trip temperature
: 155 °C
Connection voltage
: 3 x 230V+-%10/50 Hz
3 x 400 V +-%10
The fan motor must have a power supply of 230V+-%10,
3 ph, 50Hz+-%2 or 400 V +-%10, 3 ph, 50Hz+-%2.
The connection must be made with short circuit protection
(fuses) and a thermal motor safety switch, matched to the
nominal current of the motor. The motor can also be
protected against overheating by three series-connected
PTC thermistor fuses, installed in the windings. If a
frequency converter is used the thermistors must be
connected to the converter.
Before connecting the power supply please check the
diagrams on the next page to ensure that they agree with
the data on the motor name plate and the data in the
technical documentation.
The disconnect switch is located on or near the fan
section. When working on the unit the switch must be
turned off and secured with a padlock. Switching off the
disconnect switch must be done when the unit is not
energised. If work is interrupted, confirm that all circuits
are deenegized before resuming work.
Risk of injury or death by electrocution. High voltage is
present on motor leads even though the motor is not
running when a VFD is used. Open the power supply
disconnect before touching motor leads or terminals
Before opening the door or inspection hatch of the fan
section (failure, maintenance, service) all power supply
circuits must be switched off.
CAUTION: Motors with a power output of up to 2.2 kW
(230V+-%10 / 400V +-%10) have across-the-line
starting. Motors with a power output of 3 kW (400
V+-%10) should be started with the star/ delta switch.
Thermal motor fuse
If the machine has stopped due to an unexpected power
supply failure, sudden re-starting of the machine must be
avoided. The control system must include an appropriate
protection device.
