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Increased Magnetic Excitation Deceleration - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

Fr-a800 series.
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Parameters referred to
Pr.1 Maximum
frequencypage 407
Pr.8 Deceleration
timepage 349
Pr.22 Stall prevention operation
levelpage 409

5.16.13 Increased magnetic excitation deceleration

V/F
V/F
V/F
Magnetic flux
Magnetic flux Sensorless
Magnetic flux
Sensorless
Sensorless Vector
Increase the loss in the motor by increasing the magnetic flux during deceleration. The deceleration time can be reduced by
suppressing the stall prevention (overvoltage) (oL).
The deceleration time can further be shortened without a brake resistor. (When a brake resistor is used, the duty can be
reduced.)
Pr.
Name
Increased magnetic
660
excitation deceleration
G130
operation selection
661
Magnetic excitation
G131
increase rate
662
Increased magnetic
G132
excitation current level
 Setting of increased magnetic excitation rate (Pr.660, Pr.661)
• To enable the increased magnetic excitation deceleration, set Pr.660 Increased magnetic excitation deceleration
operation selection = "1".
• Set the amount of excitation increase in Pr.661 Magnetic excitation increase rate. Increased magnetic excitation
deceleration will be disabled when Pr.661 = "0".
• When the DC bus voltage exceeds the increased magnetic excitation deceleration operation level during the deceleration,
excitation is increased in accordance with the setting value in Pr.661.
• The increased magnetic excitation deceleration will continue even if the DC bus voltage goes under the increased
magnetic excitation deceleration operation level during increased magnetic excitation deceleration.
Inverter
200 V class
400 V class
With 500 V input
• When the stall prevention (overvoltage) occurs during the increased magnetic excitation deceleration operation, increase
the deceleration time or raise the setting value of Pr.661. When the stall prevention (overcurrent) occurs, increase the
deceleration time or lower the setting value of Pr.661.
• Increased magnetic excitation deceleration is enabled under V/F control, Advanced magnetic flux vector control, Real
sensorless vector control (speed control), and Vector control (speed control).
NOTE
• Increased magnetic excitation deceleration will be disabled in the following conditions:
During PM sensorless vector control, power failure stop, orientation control, operation with the FR-HC2/FR-CV, energy saving
operation, Optimum excitation control, and stop-on-contact control.
 Overcurrent prevention function (Pr.662)
• The overcurrent prevention function is enabled under V/F control and Advanced magnetic flux vector control.
• The increased magnetic excitation rate is lowered automatically when the output current exceeds the level set in Pr.662
during increased magnetic excitation deceleration.
Vector
Vector
Setting
Initial value
range
0
0
1
0 to 40%
9999
9999
100%
0 to 300%
Increased magnetic excitation
deceleration operation level
340 V
680 V
740 V
Description
Without the increased magnetic excitation deceleration function
With the increased magnetic excitation deceleration function
Set the increase of excitation.
The magnetic excitation increase rate is 10% under V/F control
and Advanced magnetic flux vector control.
The magnetic excitation increase rate is 0% under
Real sensorless vector control and Vector control.
The increased magnetic excitation rate is automatically lowered
when the output current exceeds the setting value during increased
magnetic excitation deceleration.
699
5. PARAMETERS
5.16 (G) Control parameters
1
2
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10

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