Mitsubishi FR-A800

(A) Application parameters
482
PARAMETERS
Load torque high speed frequency control settinge
• Set "2, 3 or 13" in Pr.270 Stop-on contact/load torque high-speed frequency control selection.
• When the load torque high-speed frequency selection (X19) signal ON, the inverter automatically adjusts the maximum
frequency in the range between the Pr.4 Multi-speed setting (high speed) and Pr.5 Multi-speed setting (middle speed)
in accordance with the average current in the current averaging range. The current averaging range is from the 1/2 the Pr.5
to the full Pr.5 setting (in the current averaging range).
• To use the X19 signal, set "19" in any of Pr.178 to Pr.189 (input terminal function selection) to assign the function to an
input terminal.
• This is valid in External operation mode and Network operation mode.
• The control can be activated at every start.
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
"rated inverter 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 "rated inverter 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 "rated inverter current  Pr.271 setting (%)" and smaller than "rated inverter current
 Pr.272 setting (%)", linear compensation is performed as shown below.
(STR)
X19
STF
ON ON ON
ON ON
OFF OFF
OFF
OFF
Pr.5
Pr.4
Pr.5
1
2
Power running Regenerating
A
B
Current averaging range
Current averaging range
Current averaging range Current averaging range
Current averaging range
Current averaging range
Output frequency
Time
Less than
Pr.271 setting rated current
Less than
Pr.271 setting rated current
Less than
Pr.271 setting rated current
Pr.272 setting rated current
or more
Pr.272 setting rated current
or more
Pr.272 setting rated current
or more
ON
Pr.4
(60Hz/50Hz)
Pr.5
(30Hz)
Pr.271
(50%)
Average current
Frequency
Pr.272
(100%)
Value in parenthesis is initial value.