Mitsubishi Electric FR-A800 Series Instruction Manual page 741

• During PM sensorless vector control, the upper limit of the droop compensation frequency is 400 Hz, the frequency set in
Pr.1, or the maximum motor frequency, whichever the smallest.
Droop compensation
reference
• The droop compensation frequency is calculated as follows.
Droop compensation frequency =
When the output frequency is equal to or lower than the rated frequency set in Pr.84: K＝1
When the output frequency is higher than the rated frequency set in Pr.84: K =
NOTE
• Set the droop gain equivalent to the rated slip of the motor.
• The speed loop integration can be disabled at the emergency stop using Pr.1349 Emergency stop operation selection.
(Refer to
 Limiting the frequency after the droop compensation (0 limit)
• Under Real sensorless vector control, Vector control, or PM sensorless vector control, the lower limit can be set for the
frequency command value by setting Pr.288 when the value falls below zero after droop compensation.
Pr.288 setting
0 (initial value)
*1
No droop control during
10
acceleration/deceleration
*1
20
*1
1
*1
Continuous droop control during
11
operation
*1
21
*1
2
Continuous droop control during
operation
*1
22
*1 Under Advanced magnetic flux vector control, the operation is the same as the one when the setting is "0".
740
5. PARAMETERS
5.16 (G) Control parameters
Downloaded from ManualsNet.com
Frequency
-100%
Current for torque after filtering
Rated torque current
Synchronized speed at the time of base frequency - rated rotation speed
Rated slip =
Synchronized speed at the time of base frequency
page 367.)
Operation
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Droop compensation
frequency
0
100%
Droop compensation reference × Droop gain
× K ×
When the output frequency after droop
compensation is negative
Limited at 0 Hz (limited at 0.5 Hz under Advanced
magnetic flux vector control)
• Not limited (but reversed) under Vector control or PM
sensorless vector control
• Limited at 0 Hz under Real sensorless vector control
Droop
gain
Torque
100
Rated frequency (Pr.84)
Output frequency
× 100[%]
Droop compensation
Rated motor frequency
(Pr.84 setting)
Motor speed
Per-unit speed control
reference frequency
(Pr.1121 setting)
Rated motor frequency
(Pr.84 setting)
Motor speed
Per-unit speed control
reference frequency
(Pr.1121 setting)
Rated motor frequency
(Pr.84 setting)
Per-unit speed control
reference frequency
(Pr.1121 setting)
reference