Slip Compensation - Mitsubishi Electric 800 Series Instruction Manual

15.10

Slip compensation

V/F V/F V/F
Under V/F control, the slip of the motor is estimated from the inverter output current to maintain the rotation of the motor
constant.
Pr. Name
245
Rated slip
G203
246 Slip compensation time
G204 constant
247 Constant output range slip
G205 compensation selection
• 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 =
NOTE
• 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 (OLC, OLV) operation, regeneration avoidance operation, auto tuning, stop-on-contact control, acceleration/
deceleration
Parameters referred to
Pr.1 Maximum frequencypage 211
Pr.3 Base frequencypage 376
Initial value
0.01% to
50%
9999
0, 9999
0.5 s 0.01 to 10 s
0
9999
9999
Synchronized speed at the time of base frequency
Setting
range
Set the rated motor slip.
No slip compensation
Set the response time of the slip compensation. Reducing the
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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Description
15. (G) Control Parameters
15.10 Slip compensation
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