• 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.
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 and Advanced magnetic flux vector control.
• Increased magnetic excitation deceleration will be disabled in the following conditions:
PM motor control, power failure stop, operation with the FR-HC2/FR-CV, energy saving operation, and Optimum excitation
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.
• When the inverter protective function (E.OC, E.THT) is activated due to increased magnetic excitation deceleration,
adjust the level set in Pr.662.
• The overcurrent preventive function is disabled when Pr.662 = "0".
• When the level set in Pr.662 is more than the one set in Pr.22 Stall prevention operation level, the overcurrent preventive
function is activated at the level set in Pr.22. (The level set in Pr.662 is applied when Pr.22 = "0".)
Parameters referred to
Pr.22 Stall prevention operation
Pr.30 Regenerative function
Pr.60 Energy saving control
Pr.162 Automatic restart after instantaneous power failure
Pr.261 Power failure stop
5.13.14 Slip compensation
Under V/F control, the slip of the motor is estimated from the inverter output current to maintain the rotation of the motor
Slip compensation time
Constant output range slip
5.13 (G) Control parameters
0.01 to 50%
Set the rated motor slip.
No slip compensation
Set the response time of the slip compensation. Reducing the
0.01 to 10 s
value improves the response, but the regenerative overvoltage
(E.OV) error is more likely to occur with a larger load inertia.
No slip compensation in the constant power range (frequency
range higher than the frequency set in Pr.3).
Slip compensation is performed in the constant power range.