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

Page: 929 / 1218

Parameters (G) Control parameters
FR-A800 5 - 727
5.16.12 Increased magnetic excitation deceleration
Increase the loss in the motor by increasing the magnetic flux at the time of deceleration. Decelera-
tion time can be reduced by suppressing the stall prevention (overvoltage) (oL).
It will make possible to reduce the deceleration time without a brake resistor. (Usage can be reduced
if a brake resistor is used.)
Setting of increased magnetic excitation rate (Pr. 660, Pr. 661)
●
To enable the increased magnetic excitation deceleration, set Pr. 660 "Increased magnetic excita-
tion 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 strengthened ex-
citation deceleration.
●
When the stall prevention (overvoltage) occurs during the increased magnetic excitation decel-
eration 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 with V/F control, Advanced magnetic flux
vector control, Real sensorless vector control (speed control), and vector control (speed control).
Pr. Name
Initial
value
Setting
range
Description
660
G130
Increased magnetic
excitation deceleration
operation selection
0
0 Without increased magnetic excitation deceleration
1 With increased magnetic excitation deceleration
661
G131
Magnetic excitation
increase rate
9999
0 to 40% Set the increase of excitation.
9999
Magnetic excitation increase rate 10% under V/F
control and Advanced magnetic flux vector control
Magnetic excitation increase rate 0% under Real
sensorless vector control and vector control
662
G132
Increased magnetic
excitation current level
100% 0 to 300%
The increased magnetic excitation rate is
automatically lowered when the output current
exceeds the setting value at the time of increased
magnetic excitation deceleration.
Inverter Increased magnetic excitation deceleration operation level
200 V class 340 V
400 V class 680 V
With 500 V input 740 V
Tab. 5-328: Strengthened excitation deceleration operation level
NOTE The increased magnetic excitation deceleration will be disabled in the following conditions:
During PM sensorless vector control, power failure stop, orientation control, operation with
FR-HC2/FR-CV, energy saving operation, Optimum excitation control, and stop-on-contact con-
trol.
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux Sensorless Sensorless Sensorless Vector Vector Vector