Low-Speed Range Torque Characteristics - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

Pr. Name
Current average value
557 monitor signal output
reference current
820 Speed control P gain 1
821 Speed control integral time 1 0.333 s
Torque control P gain 1
824 (current loop proportional
gain)
Torque control integral time
825
1 (current loop integral time)
870 Speed detection hysteresis
Regeneration avoidance
885 compensation frequency
limit value
Energy saving monitor
893
reference (motor capacity)
C14 Terminal 1 gain frequency
(918) (speed)
Per-unit speed control
1121
reference frequency
— : Not changed
*1 Initial value for the FR-A820-03160(55K) or lower and FR-A840-01800(55K) or lower.
*2 Initial value for the FR-A820-03800(75K) or higher and FR-A840-02160(75K) and higher.
*3 When Pr.71 Applied motor = "333, 334, 8093, 8094, 9093, or 9094", the Pr.71 setting are not changed.
*4 When a value other than "9999" is set, the set value is not changed.
*5 200 r/min when Pr.788 Low speed range torque characteristic selection = "0".
*6 13.33 Hz when Pr.788 Low speed range torque characteristic selection = "0".
*7 110% for SLD, 120% for LD, 150% for ND, and 200% for HD (Refer to Pr.570 Multiple rating setting on
*8 The Pr.702 Maximum motor frequency is used as the maximum motor frequency (rotations per minute). When Pr.702 ="9999 (initial value)",
the Pr.84 Rated motor frequency is used as the maximum motor frequency (rotations per minute).
*9 The setting value is converted from frequency to rotations per minute. (It differs according to the number of motor poles.)
*10 Refer to page 798 for the rated motor current of MM-CF.
NOTE
• If IPM parameter initialization is performed in rotations per minute (Pr.998 = "3003, 8009, or 9009"), the parameters not listed
in the table and the monitor items are also set and displayed in rotations per minute.
5.2.5

Low-speed range torque characteristics

PM PM PM
The torque characteristics in a low-speed range under PM sensorless vector control can be changed.
Pr. Name
788 Low speed range torque
G250 characteristic selection
Second motor low-speed
747
range torque characteristic
G350
selection
Setting
Induction PM motor (rotations
motor per minute)
0 (initial value)
3003
(MM-CF)
FM CA
Rated
Inverter
motor
rated current
*10
current
60% 30%
0.333 s
100% 100%
5 ms 20 ms
0 Hz 8 r/min
6 Hz 200 r/min
Inverter rated
Motor capacity (Pr.80)
current
60 Hz 50 Hz 2000 r/min
*1
120 Hz
3000 r/min
*2
60 Hz
Initial Setting
value range
Disables the low-speed range torque characteristic (current
0
synchronization operation).
9999
Enables the low-speed range torque characteristic (high frequency
*1
9999
superposition control)
Disables the low-speed range torque characteristic (current
0
synchronization operation) while the RT signal is ON.
9999
Enables the low-speed range torque characteristic (high frequency
*1
9999
superposition control) while the RT signal is ON.
PM motor (frequency)
8009, 8109,
9009 9109
3103
(other (other
(MM-CF)
than MM- than MM-
CF) CF)
Rated
motor
Pr.859 Pr.859
*10
current
*9
0.5 Hz
0.5 Hz
Pr.84 × Pr.84 ×
13.33 Hz
10% 10%
Pr.84 133.33 Hz Pr.84
Maximum
Maximum
motor
motor
rotations
200 Hz
frequency
per
8
*8
minute
Operation status
Setting increments
3003, 0, 3103,
8009, 8109,
9009 9109
*1
0.01 A
*2
0.1 A
1%
0.001 s
1%
0.1 ms
1 r/min 0.01 Hz
1 r/min 0.01 Hz
*1
0.01 kW
*2
0.1 kW
1 r/min 0.01 Hz
1 r/min 0.01 Hz
*
page 326.)
5. PARAMETERS
5.2 Control method
1
2
3
4
5
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7
8
9
10
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