Mitsubishi Electric FR-A820-04750-GF Instruction Manual page 110

NOTE
• Make sure to set Pr.998 before setting other parameters. If the Pr.998 setting is changed after setting other
parameters, some of those parameters are initialized too. (Refer to the "List of the target parameters for the motor
parameter initialization".)
• To change back to the parameter settings required to drive an induction motor, perform Parameter clear or All
parameter clear.
• Whenever the setting of Pr.998 PM parameter initialization is changed from "3003, 3044, 8009, or 9009 (rotations
per minute)" to "3103, 3144, 8109, or 9109 (frequency)", and vice versa, all the relevant parameters are initialized.
The purpose of Pr.998 is not to change the display units. Use Pr.144 Speed setting switchover to change the
display units between rotations per minute and frequency. Using Pr.144 enables switching the units between
rotations per minute and frequency without initializing the settings of the motor parameters.
Example) Changing the Pr.144 setting between "6" and "106" switches the display units between frequency and
rotations per minute.
• For an inverter out of the capacity range of the EM-A motor, the settings "3044 and 3144" are disabled. For an
inverter out of the capacity range of the MM-CF motor, the settings "3003 and 3103" are disabled.
• The PM parameter initialization (Pr.998) changes parameter settings for the first motor. When a PM motor is used
as the second motor, parameters for the second motor must be set individually.
 List of the target parameters for the motor parameter initialization
(EM-A)
• The parameter settings in the following table are changed to the settings required to perform PM sensorless
vector control by selecting PM sensorless vector control with the IPM initialization on the operation panel or with
Pr.998 PM parameter initialization. The changed settings differ according to the specification (capacity) of the
PM motor used.
• Performing Parameter clear or All parameter clear sets back the parameter settings to the settings required to
drive an induction motor.
Pr. Name
1 Maximum frequency
4 Multi-speed setting (high speed)
9 Electronic thermal O/L relay
DC injection brake operation
10
frequency
13 Starting frequency
15 Jog frequency
18 High speed maximum frequency
Acceleration/deceleration
20
reference frequency
22 Stall prevention operation level
37 Speed display
55 Frequency monitoring reference
56 Current monitoring reference
71 Applied motor
80 Motor capacity
81 Number of motor poles
84 Rated motor frequency
116 Third output frequency detection
125 Terminal 2 frequency setting gain
(903) frequency
126 Terminal 4 frequency setting gain
(905) frequency
144 Speed setting switchover
240 Soft-PWM operation selection
Induction PM motor (setting in
motor rotations per minute)
Pr.998 = "0
(initial value)" Pr.998 = "3044" (EM-A)
FM CA
Maximum motor rotations
120 Hz
*2
per minute
Rated motor rotations per
60 Hz 50 Hz
*2
minute
Inverter
Rated motor current
rated current
Rated motor rotations per
3 Hz
minute × 3%
Rated motor rotations per
0.5 Hz
minute × 0.5%
Rated motor rotations per
5 Hz
minute × 10%
Maximum motor rotations
120 Hz
*2
per minute
Rated motor rotations per
60 Hz 50 Hz
*2
minute
150% 200%
0 0
Rated motor rotations per
60 Hz 50 Hz
*2
minute
Inverter
Rated motor current
rated current
0 1140
9999
Motor capacity (EM-A)
9999
Number of motor poles (EM-A)
Rated motor rotations per
9999
*2
minute
Rated motor rotations per
60 Hz 50 Hz
*2
minute
Rated motor rotations per
60 Hz 50 Hz
*2
minute
Rated motor rotations per
60 Hz 50 Hz
*2
minute
Number of motor poles (EM-
4
*2
A) + 100
1 0
3
PM motor (setting in
frequencies)
Pr.998 = "3144" (EM-A)
Maximum motor frequency
Rated motor frequency
*2
Rated motor frequency ×
*2 *2
3%
Rated motor frequency ×
*2 *2
0.5%
Rated motor frequency ×
*2 *2
10%
Maximum motor frequency
Rated motor frequency
Rated motor frequency
*2
*1
*1
Rated motor frequency
Rated motor frequency
Rated motor frequency
Rated motor frequency
Number of motor poles (EM-
*2
A)
Setting increments
Pr.998 = Pr.998 =
"3044" "0, 3144"
*2
1 r/min 0.01 Hz
*2
1 r/min 0.01 Hz
0.01 A
1 r/min 0.01 Hz
1 r/min 0.01 Hz
1 r/min 0.01 Hz
*2
1 r/min 0.01 Hz
*2
1 r/min 0.01 Hz
0.1%
1
*2
1 r/min 0.01 Hz
0.01 A
1
0.01 kW
1
*2
1 r/min 0.01 Hz
*2
1 r/min 0.01 Hz
*2
1 r/min 0.01 Hz
*2
1 r/min 0.01 Hz
1
1
BCN-C22005-1008