Mitsubishi Electric FR-E800 Instruction Manual page 542

 Brake operation list
• The relation between the DC injection brake operation and pre-excitation operation is as follows.
Control method
V/F control
Advanced magnetic flux vector
control
Real sensorless vector control
Vector control
PM sensorless vector control
(motor other than MM-GKR or
EM-A)
PM sensorless vector control
(MM-GKR or EM-A)
 Pre-excitation signal (LX signal)
• When the Pre-excitation/servo ON (LX) signal is turned ON while the motor stops under Real sensorless vector control,
Vector control, or PM sensorless vector control, pre-excitation (zero speed control / servo lock) starts.
• To input the LX signal, set "23" in any parameter from Pr.178 to Pr.189 (Input terminal function selection) to assign the
function.
Zero speed control
Servo lock
NOTE
• Changing the terminal assignment using Pr.178 to Pr.189 (Input terminal function selection) may affect the other functions.
Set parameters after confirming the function of each terminal.
• Performing pre-excitation (LX signal and X13 signal) under torque control may start the motor running at a low speed even
when the start signal (STF or STR) is not input. This product with the start command ON may also rotate the motor at a low
speed when the speed limit value is set to zero. Confirm that the motor running does not cause any safety problems before
performing pre-excitation.
• Note that during the pre-excitation operation, a voltage is applied to the motor even when the [RUN] LED on the operation
panel or the FWD/REV indicator on the parameter unit is OFF.
• When offline auto tuning (Pr.96 Auto tuning setting/status = "1, 11, or 301") is performed during pre-excitation operation,
pre-excitation is disabled.
• When the LX signal is ON and the start signal is OFF at the automatic restart after instantaneous power failure, the motor does
not decelerates to stop from the detected motor speed, and pre-excitation (zero speed control / servo lock) is applied.
Control Pr.802
Pr.850
mode (Pr.1299)
— — —
— — —
— 0
— 1
Speed
— 2
— 0
— 1
Torque
— 2
0 —
Speed
1 —
Torque — —
Position — —
Speed 0 —
0
Speed —
1
Position — —
When Pr. 850 = 1
(Hz)
Normal operation
Pr. 11
Operation time
LX signal
16.6 DC injection brake, zero speed control, servo lock, and magnetic flux decay output shutoff
Deceleration stop LX-ON
DC injection brake —
DC injection brake —
DC injection brake
Zero speed
Zero speed
Magnetic flux decay
Zero speed
output shutoff
DC injection brake
Zero speed
Zero speed
Magnetic flux decay
Zero speed
output shutoff
Zero speed Zero speed
Servo lock Servo lock
Zero speed Zero speed
— Servo lock
DC injection brake —
Zero speed Zero speed
Servo lock Servo lock
— Servo lock
Pr. 10
Operation
frequency
Normal operation
ON
X13-ON
(Pr.11 = "8888")
DC injection brake
DC injection brake
Zero speed
Zero speed
Zero speed
Zero speed
Zero speed
Servo lock
Zero speed
—
DC injection brake
Zero speed
Servo lock
—
Time
16. (G) Control Parameters
11
12
13
14
15
16
17
18
19
20
541