Mitsubishi Electric FR-E800 Instruction Manual page 541

• The magnetic flux decay output shutoff will be canceled at the time of restart and when the Pre-excitation/servo ON (LX)
signal or External DC injection brake operation start (X13) signal is turned ON.
• If an MC is installed at the inverter's output side, set to open the MC after the operation time of the magnetic flux decay
output shutoff elapses. (See below.)
Motor capacity (Pr.80 setting)
Magnetic flux decay process time
NOTE
• Under a control other than Real sensorless vector control, the inverter will immediately shutoff the output when the X74 signal
is turned ON.
• Even under Real sensorless vector control, the inverter will immediately shutoff the output when the X74 signal is turned ON
during the automatic restart after instantaneous power failure and online auto tuning during the start up.
• If another output-shutoff trigger (inverter fault, turning ON the MRS signal, etc.) occurs during the magnetic flux decay
operation, the magnetic flux decay operation is terminated, and the output is shut off immediately.
• Unlike the MRS signal, voltage is output during the magnetic flux decay output shutoff operation, so take caution on electric
shocks.
• When the release timing of the mechanical brake is too fast, the motor shaft may be rotated by dropping or external force.
When the release timing is too late, the overcurrent prevention operation, stall prevention operation, or electronic thermal O/
L relay function may be activated. Perform release of the mechanical brake matching the equipment using the Output
frequency detection (FU) signal or Output current detection (Y12) signal.
• 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.
 Brake operation selection under Vector control (Pr.802, Pr.1299)
• Use Pr.802 Pre-excitation selection to select the braking operation when the pre-excitation is performed from either zero
speed control or servo lock.
Pr.802
(Pr.1299)
excitation
setting
Zero speed
0 (initial value)
control
1 Servo lock
540
16. (G) Control Parameters
16.6 DC injection brake, zero speed control, servo lock, and magnetic flux decay output shutoff
2.2 kW or lower
250 ms
Pre-
Even under a load, the inverter does not rotate the motor and holds 0 r/min. However, it will not return to
its original position when the shaft moves due to external force. This setting is invalid during position control.
The inverter operates according to this setting only during speed control.
Even under a load, the inverter holds the position of the motor shaft. When the shaft moves due to external
force, it will return to its original position after the external force is removed.
To perform the position control, this loop gain can be adjusted using Pr.422 Position control gain
(Pr.1298 Second position control gain).
3.7 kW to 11 kW 15 kW to 30 kW
500 ms 800 ms
Description