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

Page: 717 / 1218

Parameters (A) Application parameters
FR-A800 5 - 515
Operation of load torque high-speed frequency control
●
When the average current of the current averaging range (chart A below) during operation with
the X19 signal ON is the "inverter rated current × Pr. 271 setting (%)" or less, the maximum
frequency automatically becomes the Pr. 4 "Multi-speed setting (high speed)" setting value.
●
When the average current of the current averaging range (chart B below) during operation with
the X19 signal ON is greater than the "inverter rated current × Pr. 272 setting (%)", the maximum
frequency automatically becomes the Pr. 5 "Multi-speed setting (middle speed)" setting value.
●
During regeneration load operation, the Pr. 5 setting is the maximum frequency regardless of the
average current.
●
When Pr. 273 is used, the current averaging range can be set between one half of the frequency
of the Pr. 273 setting value and the Pr. 273 set frequency. (However, the setting value must be
smaller than Pr. 5 setting.)
●
When the average current is larger than "inverter rated current × Pr. 271 setting (%)" and smaller
than "inverter rated current × Pr. 272 setting (%)", linear compensation is performed as shown
below.
I002680E
Fig. 5-242: Operation of load torque high-speed frequency control
I001626E
Fig. 5-243: Current averaging range
(STR)
X19
STF
1
2
A
B
Power running
Current averaging range
Less than
Pr. 271 setting x rated current
OFF OFF ON
ON
ON
ON
ON
ON
Ou
tp
ut
f
re
q
u
e
n
c
y
Pr. 4
Pr. 5
Pr. 5
Current averaging range
Pr. 272 setting x rated current
or more
OFF
OFF
Time
Regenerating
Average current
Frequency
Pr. 272
(100 %)
Pr. 271
(50 %)
Pr. 4
(60 Hz/50 Hz)
Pr. 5
(30 Hz)
Value in parentheses is initial value.