Switch-Off Threshold; Holding Time; Direct Current Brake - BONFIGLIOLI ACTIVE Cube ACU 201-01 Operating Instructions Manual

12.2.1 Switch-Off Threshold

The
Switch-off threshold stop function
standstill of the drive is recognized. This percentage parameter value is relative to
the set
Maximum frequency
The switch-off threshold is to be adjusted according to the load behavior of the drive
and the device output, as the drive must be controlled to a speed below the switch-
off threshold.
No.
637 Switch-off threshold
WARNING
If the motor builds up a stopping torque, it may be possible that the switch-off
threshold stop function is not reached due to the slip frequency and the standstill of
the drive is not recognized. In this case, increase the value of the
old stop function

12.2.2 Holding Time

The
Holding time stop function
stopping behavior 6. Controlling to speed zero leads to a heating of the motor and
should only be done for a short period in internally ventilated motors.
No.
638 Holding time stop function
12.3

Direct current brake

Stopping behaviors 3, 6, 7 and the search run function include the direct current
brake. Depending on the setting of the stop function, a direct current is impressed
into the motor either directly or, when it is at a standstill, after the demagnetization
time. The impression of the
should only be done for a short period in the case of internally ventilated motors.
No.
631 Braking current
I = Nominal Output current of Frequency inverter
FIN
The setting of the parameter
behavior. Contact-controlled operation of the direct current brake is activated by
entering the value zero for the
Time controlled:
The direct current is controlled by the status of the signals Start clockwise and Start
anticlockwise. The current set by the parameter
time set by the parameter
For the duration of the braking time, the control signals Start clockwise and Start
anticlockwise are logical 0 (Low) or 1 (High).
140
419.
Parameter
Description
637.
638 is considered in stopping behavior 1, 3, 4 and
Parameter
Description
Braking current
Parameter
Description
Braking time
Braking time
Braking time
Operating Instructions ACU
637 defines the frequency as from which a
Settings
Min. Max.
0.0 % 100.0 %
Settings
Min. Max.
0.0 s 200.0 s
631 results in the motor heating up and
Settings
Min. Max.
0.00 A
√2⋅I
FIN
632 defines the time-controlled stopping
632.
Braking current
632 has expired.
Fact. sett.
1.0 %
Switch-off thresh-
Fact. sett.
1.0 s
Fact. sett.
√2⋅I
FIN
631 flows until the
06/13