Mitsubishi FR-A740-00023-EC, Instruction Manual

Page: 205 / 474

195
Motor brake and stop operation
4
P
ARAME
T
E
R
S
When Pr. 11 = "0.1 to 10s"
When
Pr. 11
= "8888"
(1) Operation frequency setting (Pr. 10)
⋅
When the frequency at which the DC injection brake (zero speed control,
servo lock) operates is set in Pr. 10 , the DC injection brake (zero speed
control, servo lock) is operated when this frequency is reached during
deceleration.
⋅
At the Pr. 10 setting of "9999", the DC injection brake (zero speed control,
servo lock) is operated when deceleration is made to the frequency set in
Pr. 13 Starting frequency .
(2) Operation time setting (X13 signal, Pr. 11)
⋅
Use Pr. 11 to set the duration period the DC injection brake (zero speed
control, servo lock) is applied.
⋅
When the motor does not stop due to large load moment (J), increasing the
setting produces an effect.
⋅
When Pr. 11 = "0s", the DC injection brake (zero speed control, servo lock)
is not operated. (At a stop, the motor coasts.)
⋅
When
Pr. 11
= "8888", the DC injection brake (zero speed control, servo
lock) is applied when X13 signal is turned on.
⋅
For the terminal used for X13 signal input, set "13" in any of Pr. 178 to Pr.
189 to assign the function. (Refer to page 222)
Time
Pr
. 10
Operation
frequency
Time
Pr.12
Operation
voltage
voltage
Pr. 11 Operation time
Output frequency (Hz)
DC injection
brake
Pr. 12
OFF ON
STF
ON
X13 signal
Output frequency
(Hz)
DC injection
brake
voltage
ON
Time
Time
REMARKS
⋅
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.
REMARKS
⋅
When the X13 signal is turned on with Pr. 11 = "8888", zero speed control is
activated regardless of setting of Pr. 850 Brake operation selection .
⋅
Under vector control, zero speed control or servo lock is activated depending
on the
Pr. 802 setting.