Mitsubishi Electric FR-A700 EC, Instruction Manual

Page: 422 / 826

Motor brake and stop operation Parameter
6 - 242
This parameter can be set when the FR-A7AP (option) is mounted.
Operation frequency setting (Pr. 10)
When the frequency at which the DC injection brake operates is set to Pr. 10, the DC injection
brake is operated when this frequency is reached during deceleration.
At the Pr. 10 setting of "9999", the DC injection brake is operated when deceleration is made to
the frequency set in Pr. 13 "Starting frequency".
Pr.
No.
Name Initial Value
Setting
Range
Description Parameters referred to
Refer to
Section
10
DC injection
brake operation
frequency
3Hz
0 to 120 Hz
Set the operation frequency of the DC injection
brake.
13
71
178–189
422
Starting
frequency
Applied motor
Input terminal
function selec-
tion
Position loop
gain 6.11.2
6.12.2
6.14.1
6.5.6
9999 Operated at Pr. 13 or less.
11
DC injection
brake operation
time
0.5s
0 DC injection brake (zero speed control) disabled
0.1 to 10s
Set the operation time of the DC injection brake
(zero speed control, servo lock).
8888 Operate when X13 signal is on.
12
DC injection
brake operation
voltage
00250
or
less
4%
0 to 30%
Set the DC injection brake voltage (torque).
When "0" is set, DC injection brake is disabled.
00310
to
01800
2%
02160
or
more
1%
802
Pre-excitation
selection
0
0 Zero speed control
1 Servo lock
850
Auswahl
Bremsbetrieb
0
0 DC injection brake operation
1 Zero speed control
Fig. 6-96:
When Pr. 11 is set to a value between 0.1
and 10s
I000007C
NOTES Performing pre-excitation (zero speed control) under real sensorless vector may cause
motor vibration, etc. at deceleration to stop. To prevent this, set Pr.10 DC injection brake
operation frequency to 0.5Hz or less.
The initial value of Pr. 10 automatically changes to 0.5Hz during vector control.
100
t
t
Output frequency [Hz]
DC injection br
ak
e
vo
lt
a
g
e
Pr. 10
Pr. 11
Pr. 12