Mitsubishi Electric FR-A800, Instruction Manual

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Parameters (G) Control parameters
FR-A800 5 - 697
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.
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.
Pr. 288
Setting
Operation
When the droop compensation frequency is
negative Droop compensation
reference
0
(initial value) Without droop control during
acceleration/deceleration
Limit with 0 Hz
(Limit with 0.5 Hz under Advanced magnetic
flux vector control)
Rated motor frequency
10
Motor speed
1
Constantly droop control during
operation
Rated motor frequency
11 Motor speed
2
Constantly droop control during
operation
Do not limit (reverse)
(At the time of vector control, PM sensorless
vector control)
Rated motor frequency
Limit with 0 Hz
(At the time of Real sensorless vector control)
Tab. 5-316: Setting of parameter 288
I002759E
Fig. 5-348: Setting a break point for droop control
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%
100%
-100%
0
Increased amount of the
droop compensation
frequency
Frequency
Droop break point gain
(Pr. 994)
Droop break point torque
(Pr. 995)
Droop compensation
frequency
Rated
frequency
Droop gain
(Pr. 286)
Torque