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 fluctuations.
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.
Assembly instructions ECblue Diagnostics / Faults
L-BAL-F055D-GB 2021/51 Index 006 Part.-No.
45/56
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