Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 313 / 1218

Parameters Speed control under Real sensorless vector control, vector control, PM sensorless vector control
FR-A800 5 - 111
Compensating the speed control P gain in the constant output range (Pr. 1116)
●
In the constant output range (rated speed or higher), the response of speed control is reduced
due to weak field. Thus, the speed control P gain is needed to be compensated using Pr. 1116
"Constant output range speed control P gain compensation".
●
In Pr. 1116, set a compensation amount for the doubled rated speed regarding the speed control
P gain at the rated speed or lower as 100%.
(Speed control P gain at rated speed or higher) =
= (Speed control P gain at rated speed or lower) × (100% + compensation amount)
Compensation amount = Pr. 1116 / Rated speed × (Speed – Rated speed)
Setting the speed control P gain in the per-unit system (Pr. 1117, Pr. 1118, Pr. 1121)
●
The speed control P gain can be set in the per-unit (pu) system.
●
In the per-unit system:
When "1" is set, the torque (Iq) command is 100% (rated Iq) when the speed deviation is 100%.
When "10" is set, the torque (Iq) command is 10% (rated Iq) when the speed deviation is 100%.
Set the 100% speed in Pr. 1121 "Per-unit speed control reference frequency".
●
The speed control P gain becomes as follows according to Pr. 1117 "Speed control P gain 1 (per-
unit system)", Pr. 1118 "Speed control P gain 2 (per-unit system)", and the RT signal.
I002815E
Fig. 5-27: Compensation range of speed control P gain
Pr. 1117 Pr. 1118 Pr. 830 RT signal Speed control P gain
9999 9999
— OFF Pr. 820
9999 ON Pr. 820
Other than 9999 ON Pr. 830
Other than 9999 9999 — — Pr. 1117
9999 Other than 9999 —
OFF Pr. 820
ON Pr. 1118
Other than 9999 Other than 9999 —
OFF Pr. 1117
ON Pr. 1118
Tab. 5-38: Speed control P gain in the per-unit system
NOTES The per-unit system setting is available only under Real sensorless vector control or vector control.
When the speed control P gain or model speed control gain is set in the per-unit system, the easy
gain tuning selection (Pr. 819 = "1 or 2") becomes invalid.
100%
0%
200%
150%
Ratio multiplied to speed
control P gain
Pr. 1116 = 100%
Pr. 1116 = 50%
Pr. 1116 = 0% (initial value)
Speed
Rated speed × 2 Rated speed