(G) Control parameters
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.
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-
200 V class
400 V class
With 500 V input
Tab. 5-288: Strengthened excitation deceleration operation level
● 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
● Increased magnetic excitation deceleration is enabled with V/F control, Advanced magnetic flux
The increased magnetic excitation deceleration will be disabled in the following conditions:
During PM motor control, power failure stop, operation with FR-HC2/FR-CV, energy saving opera-
tion, Optimum excitation control.
5 - 564
excitation current level
Increased magnetic excitation deceleration operation level
Without increased magnetic excitation deceleration
With increased magnetic excitation deceleration
0 to 40%
Set the increase of excitation.
Magnetic excitation increase rate 10%
The increased magnetic excitation rate is
automatically lowered when the output current
0 to 300%
exceeds the setting value at the time of increased
magnetic excitation deceleration.