• 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.270 Stop-on contact/load torque high- speed frequency control
Pr.261 Power failure stop
Pr.350 Stop position command
5.16.14 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
• Calculate the rated motor slip and set the value in Pr.245 to enable slip compensation.
Slip compensation is not performed when Pr.245 = "0 or 9999".
Synchronized speed at the time of base frequency - rated rotation speed
Rated slip =
• When the slip compensation is performed, the output frequency may become larger than the set frequency. Set Pr.1 Maximum
frequency higher than the set frequency.
• Slip compensation will be disabled in the following conditions:
Stall prevention (oL, OL) operation, regeneration avoidance operation, auto tuning, encoder feedback control operation
Parameters referred to
5.16.15 Encoder feedback control
This controls the inverter output frequency so that the motor speed is constant to the load variation by detecting the motor
speed with the speed detector (encoder) to feed back to the inverter.
A Vector control compatible option is required.
5.16 (G) Control parameters
Synchronized speed at the time of base frequency
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.
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