9.3
Brake function and behaviour in rotation by air current
At applied line voltage, enable and a setting signal above "0", the speed control is active and the
speed is stable even under load
fl
uctuations.
If the motor is not controlled with line voltage applied, i.e. without enable or with enable with setting
signal "0", the brake function becomes active to hold the motor until start (holding brake).
•
If the line voltage is switched on whilst the fan is rotating in reverse (wrong turning direction), this is
decelerated and started in the correct turning direction at a setting signal above "0". To protect the
electronics against too high braking current, this function is partly (fan-dependent) only possible up
to a certain speed value.
•
The braking function also becomes active to bring the fan to a standstill when this is driven with a
speed below 100 min
-1
(without control). At speeds above 100 min
-1
the motor control does not
intervene.
•
When driven in correct direction of rotation and with enable with a setting signal above "0", the
motor is started whilst the fan is rotating.
Behaviour in strong drive in reverse direction (e.g. suction)
The braking effect with applied line voltage is limited, strong reverse acting forces can lead to
rotational movement despite the holding brake.
From a certain level (fan-dependent) it is no longer possible to start the fan in the correct turning
direction (=> message: Fault motor start). Further start attempts follow; the error message disappears
if start is successful.
Information
•
Do not switch off the line voltage so that the braking function can prevent rotation of the fan in
reverse (wrong) direction and safe starting is possible.
•
If the application requires safe starting after switching on the line voltage, too strong an air current
(suction effect) in reverse direction must be prevented by suitable measures.
•
Special settings are possible which can lead to deviations from the above functional description.
10
Service work
10.1
Repairs / maintenance
Attention!
•
Please read the Safety instructions chapter before working on the fan!
•
Before working on the fan, this must be disconnected from the power supply and secured against
switching back on!
•
No maintenance work at running fan!
•
Allow maintenance work to be carried out by trained specialists only.
•
Any faults detected in the electric system/modules/operating equipment must be corrected
immediately. If these faults are not corrected, the device/system is potentially very dangerous. The
device/system must therefore not be operated when it is faulty.
•
Wear safety shoes and gloves for handling!
•
Please observe the safety regulations and the worker
´
s protection rules by all maintenance and
service work (EN 50 110, IEC 364).
•
Fuses must always be only replaced; never repaired or bridged. The speci
fi
cations for the maximum
series fuse must always be adhered to (see Technical data). Only fuses cited in the electrical circuit
diagram may be used.
•
Generator operation can produce dangerous voltages (see safety instructions)!
•
Keep the airways of the fan free - danger because of objects dropping out!
•
Watch out for vibration free motion!
•
The impeller is subject to natural wear depending on the area of application and the conveying
medium. Deposits on the impeller can lead to imbalance and damage (danger of permanent
fracture). The impeller can burst!
•
If highly aggressive media for which the product is not suited are conveyed, the severe corrosion
may result in the impeller breaking. Any impellers corroded in this way must be replaced
immediately.
Assembly instructions
ECblue
Service work
L-BAL-F055D-GB 1634 Index 002
Part.-No.
43/51
