Mitsubishi Electric FR-A820-00046 Instruction Manual page 787

Parameters
V/F control, Advanced magnetic flux vector control
Power supply
(R/L1, S/L2,
T/L3)
Motor speed N
(r/min)
Inverter output
frequency f (Hz)
Inverter output
voltage E(V)
Coasting
time (Pr. 57)
* The output shut off timing differs
according to the load condition.
Fig. 5-288:
NOTES The rotation speed detection time (frequency search) changes according to the rotation speed of
the motor. (maximum 1 s)
When the inverter capacity is two ranks or greater than the motor capacity, the overcurrent pro-
tective function (E.OC[]) is sometimes activated and prevents the inverter from restarting.
If two or more motors are connected to one inverter, this function operates abnormally. (The
inverter does not restart successfully.)
Because a DC injection brake is applied instantaneously at speed detection during a restart, the
speed might drop if the moment of inertia (J) of the load is small.
If reverse operation is detected when "1" (reverse rotation disabled) is set to Pr. 78, operation
decelerates by reverse rotation and then changes to forward rotation when the start command is
forward rotation. The inverter does not restart when the start command is reverse rotation.
When "3, 13" is set to Pr. 162, limit the wiring length to within 100 m.
FR-A800
Instantaneous (power failure) time
∗
Restart cushion
Speed
time (Pr. 58 setting)
detection
+
time
Acceleration time
at a restart
(Pr. 611 setting)
Automatic restart in different operation modes
(A) Application parameters
Real sensorless vector control
Instantaneous (power failure) time
Power supply
(R/L1, S/L2,
T/L3)
Motor speed N
(r/min)
Inverter output
frequency f(Hz)
∗
output voltage
E(V)
Speed
Coasting
detection
+
time (Pr. 57)
time
* The output shut off timing differs
according to the load condition.
Acceleration time
at a restart
(Pr. 611 setting)
I002713E
5 - 585