Mitsubishi Electric FR-A820-00046 Instruction Manual page 937

Parameters
Limiting the frequency after the droop compensation (0 limit)
By setting Pr. 288 at the time of Real sensorless vector control, vector control, or PM sensorless control,
the negative frequency command when the frequency after droop compensation can be limited.
Pr. 288
Setting
0
(initial value) Without droop control during
10
1
11
2
Tab. 5-330: Setting of parameter 288
During Advanced magnetic flux vector control, the action same as the "0" setting will be per-
formed.
Droop control break point setting (Pr. 994, Pr. 995)
By setting Pr. 994 and Pr. 995, break point (1 point) can be set up for the droop compensation fre-
quency. Setting a break point allows the inverter to raise the droop compensation frequency for light-
load (no load) operation without raising it for heavy-load operation.
Fig. 5-366:
NOTE Droop break point function is disabled in one of following conditions:
(Linear compensation by Pr. 286 will be performed.)
● Pr. 995 = "100% (initial value)"
● Pr. 286 < Pr. 994
● Pr. 994 ≤ Pr. 995 × Pr. 286 / 100%
FR-A800
Operation
acceleration/deceleration
Constantly droop control during
operation
Constantly droop control during
operation
Increased amount of the
droop compensation
frequency
Rated
frequency
Droop compensation
frequency
-100%
Setting a break point for droop control
When the droop compensation frequency is
negative
Limit with 0 Hz
(Limit with 0.5 Hz under Advanced magnetic
flux vector control)
Do not limit (reverse)
(At the time of vector control, PM sensorless
vector control)
Limit with 0 Hz
(At the time of Real sensorless vector control)
Frequency
Droop break point gain
(Pr. 994)
Droop break point torque
(Pr. 995)
0
(G) Control parameters
Droop compensation
reference
Rated motor frequency
Motor speed
Rated motor frequency
Motor speed
Rated motor frequency
Droop gain
(Pr. 286)
Torque
100%
I002759E
5 - 735