Mitsubishi Electric FR-A800, Instruction Manual

Page: 852 / 1042

(G) Control parameters Parameters
5 - 672
At a stop condition, the motor is accelerated at the Pr. 13 "Starting frequency" (0.01 Hz under PM
sensorless vector control).
The output frequency to be compared with the Pr. 522 setting is the output frequency before slip
compensation (V/F control and Advanced magnetic flux vector control), or the speed command
value converted into the frequency (Real sensorless vector control, vector control, and PM sensor-
less vector control).
Steepness of the slope depends on the acceleration/deceleration time settings such as Pr. 7.
I002844E
Fig. 5-334: Example for inverter output shutoff
NOTES Motor coasts when the command value drops to Pr. 522 or lower while the start signal is ON. If the
command value exceeds Pr. 522+2 Hz again while coasting, the motor starts running at Pr. 13
Starting frequency (0.01 Hz under PM sensorless vector control). When the motor re-accelerates
after coasting, the inverter may trip in some parameter settings. (Activation of the restart function
is recommended especially for a PM motor.)
The output stop frequency function is disabled during PID control, JOG operation, power failure
stop, traverse function operation, offline auto tuning, orientation control, position control, torque
control, stop-on contact control, or machine analyzer operation.
Output stop function does not operate during reverse rotation deceleration. However, when the
frequency setting signal and output frequency falls to Pr. 522 or lower, the inverter coasts to a
stop.
During the output stop due to the output stop function (when forward/reverse command is given,
but frequency command is not given), FWD/REV LED indication on the operation panel flickers
fast.
E
CAUTION:
A PM motor is a motor with interior permanent magnets. High voltage is generated at motor
terminals while the motor is running. Do not touch motor terminals and other parts until the
motor stops to prevent an electric shock.
STF
RUN
Example of target frequency = analog input command, start signal always ON
Analog input command
Pr. 522+2 Hz
Output frequency
Time
Time
Inverter output
shutoff
Inverter output
shutoff
Pr. 522+2 Hz
Pr. 522
Pr. 522
Pr. 13