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15/24 BCN-C22005-634
If torque is required in a low-speed range (less than 1/10 of the rated motor frequency), set Pr.791 Acceleration time in
low-speed range and Pr.792 Deceleration time in low-speed range settings higher than the Pr.7 Acceleration time and Pr.8
Deceleration time settings so that the mild acceleration/deceleration is performed in the low-speed range. (For an
operation with second acceleration/deceleration times, set the acceleration/deceleration times longer than the second
acceleration/deceleration times.)
1.8 DC injection brake of the PM sensorless vector control
DC injection brake under PM sensorless vector control is performed as below.
REMARKS
Set Pr.791 higher than Pr.7, and Pr.792 higher than Pr.8. If set as Pr.791 < Pr.7, the operation is performed as Pr.791 = Pr.7. If
set as Pr.792 < Pr.8, the operation is performed as Pr.792 = Pr.8.
Refer to page 6 for the rated motor frequency of MM-CF.
REMARKS
The X13 signal is disabled during PM sensorless vector control.
Low-speed range
(rated motor frequency/10
)
Acceleration time
Slope set by Pr.7
Deceleration time
Slope set by Pr.8
Deceleration time
in low-speed range
Slope set by Pr.792
A
cceleration time
in low-speed range
Slope set by Pr. 791
Time
Output
frequency
(Hz)
PMPMPM
Time Time
Time
Pr.11
Calculated speedCalculated speed
<High frequency superposition control (Pr.788 = "9999 (initial value)")>
Commanded speed
Commanded speed
Pr.10
Pr.10
Output frequency
(Hz)
Output frequency
(Hz)
DC braking voltage
(V)
When Pr.11 = "0"When Pr.11 "0"
DC injection brake applied
when:
The commanded speed = 0Hz
The calculated speed
Pr.10
Motor coasting when:
The commanded speed Pr.10
The calculated speed Pr.10
Motor coasting when:
The commanded speed Pr.10
The calculated speed Pr.10
Pr.11
Tim
e
Pr.10
Time
Time
<Current synchronization operation Pr.788 = "0">
When Pr.11 = "0"
When Pr.11 "0"
Calculated speed
Commanded
speed
DC injection brake applied when
the commanded and calculated
speeds are 0Hz
Output frequency
(Hz)
Output frequency
(Hz)
DC braking voltage
(V)
bcnc22005634.fm 15 ページ ２０１２年７月３日 火曜日 午前９時４３分