Mitsubishi Electric FR-A720-0.4K Instruction Manual page 213

(2) PM sensorless vector control display and PM sensorless vector control signal
P.RUN on the operation panel (FR-DU07) is lit and the PM sensorless vector control signal (IPM) is output
during PM sensorless vector control.
For the terminal to output the PM sensorless vector control signal, assign the function by setting "57 (positive
logic)" or "157 (negative logic)" in any of Pr.190 to Pr.196 (Output terminal function selection).
(3) Loss of synchronism detection
Operation Panel
Indication
Name
Description
Description
Corrective action
1.2 Initializing the parameters required for the PM sensorless vector control
(Pr.998)
· By performing IPM parameter initialization, PM sensorless vector control is selected and the
parameters, which are required to drive an IPM motor, are selected. Initial settings and setting ranges
of the parameters are adjusted automatically to drive an IPM motor.
· Two IPM parameter initialization methods are available; setting Pr.998 IPM parameter initialization, and
selecting
can be selected.
Parameter
Name
number
IPM parameter
998
*1
initialization
*1 This parameter allows its setting to be changed in any operation mode even if "0 (initial value)" is set in Pr. 77 Parameter write selection.
*2 To use an IPM motor other than MM-CF, offline auto tuning must be performed for the IPM motor.
E.SOT
P M P M P M
Loss of synchronism detection
Stops the output when the operation is not synchronized. (This function is only available
under PM sensorless vector control.)
· Check that the IPM motor is not driven overloaded.
· Check if a start command is given to the inverter while the IPM motor is coasting.
· Check if a motor other than the IPM motor (MM-CF series) is driven.
· Set the acceleration time longer.
· Reduce the load.
· If the inverter restarts during coasting, set Pr.57 Restart coasting time "9999," and select
the automatic restart after instantaneous power failure.
· Drive an IPM motor (MM-CF series).
· To perform PM sensorless vector control on an IPM motor other than MM-CF, contact your
sales representative.
P M P M P M
(IPM parameter initialization) mode on the operation panel. One of the two methods
Initial Setting
value range
3003
0
3103
8009
8109
FR-PU04
FR-PU07
Parameter settings for a general-
0
purpose motor (frequency)
Parameter settings for an MM-CF IPM
motor (rotations per minute)
Parameter settings for an MM-CF IPM
motor (frequency)
Parameter (rotations per minute)
settings for an IPM motor other than
MM-CF (after tuning)
Parameter (frequency) settings for an
IPM motor other than MM-CF (after
tuning)
*2
4/24
Fault 14
Motor step out
Description
Initial parameter
settings required to
drive a general-
purpose motor are
set.
Initial parameter
settings required to
drive an IPM motor
are set.
*2
BCN-C22005-634