BONFIGLIOLI ACTIVE Cube ACU 201-11 User Manual

12.2.1 Switch-Off Threshold
The Switch-off threshold stop function 637 defines the frequency as from which a
standstill of the drive is recognized. This percentage parameter value is rela
tive to
the set Maximum frequency 419.
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.
Parameter Settings
No.
Description
Min.
Max.
Fact. sett.
637
Switch-off threshold
0.0 %
100.0 %
1.0 %
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 Switch-off thresh-
old stop function 637.
12.2.2 Holding Time
The Holding time stop function 638 is considered in stopping behavior 1, 3, 4 and
stopping behavior 6. Controlling to speed zero leads to a heating of the mo
tor and
should only be done for a short period in internally ventilated motors.
Parameter
Settings
No.
Description
Min.
Max.
Fact. sett.
638 Holding time stop function 0.0 s 200.0 s 1.0 s
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 Braking current 631
results in the motor heating up and
should only be done for a short period in the case of internally ventilated motors.
Parameter
Settings
No.
Description
Min.
Max.
Fact. sett.
631
Braking current
0.00 A
√
2
⋅
I
FIN
√
2
⋅
I
FIN
I
FIN
= Nominal Output current of Frequency inverter
The setting of the parameter Braking time 632 defines the time-controlled stopping
behavior. Contact-
controlled operation of the direct current brake is activated by
entering the value zero for the Braking time 632.
Time controlled:
The direct current is controlled by the status of the signals Start clockwise and Start
anticlockwise. The current set by the parameter Braking current 631
flows until the
time set by the parameter Braking time 632 has expired.
For the duration of the bra
king time, the control signals Start clockwise and Start
anticlockwise are logical 0 (Low) or 1 (High).
140 Operating Instructions ACU 06/13

BONFIGLIOLI ACTIVE Cube ACU 201-11 Specifications

General

Brand	BONFIGLIOLI
Model	ACTIVE Cube ACU 201-11
Category	Inverter
Language	English