48
(4) Motor No-Load Current (Cn-10)
•
This setting is used as a reference value for torque compensation function.
•
The setting range is 0
∼
99
％
of the inverter rated current Cn-09 (100%).
•
The slip compensation is enabled when the output current is greater than motor no-
load current (Cn-10). The output frequency will shift from f1 to f2 (>f1) for the
positive change of load torque. (See Fig. 19)
Motor rated slip (Cn-11) ×(Output current – Motor no-load current(Cn-10))
•
Slip compensation =
Motor rated current (Cn-09) – Motor no-load current (Cn-10)
Load torque
speed
f1
f2
larger load
smaller load
Fig. 19 Output frequency with slip compensation.
(5) Motor Rated Slip (Cn-11)
•This setting is used as a reference value for torque compensation function. See Fig.
19. The setting is 0.0~9.9% as a percentage of motor Max. voltage frequency (Cn-
04) as 100%.
•The setting is shown in Fig. 20 in the constant torque and constant output range. If
setting Cn-11 is zero, no slip compensation is used.
•There is no slip compensation in the cases when the frequency command is less
than the Min. output frequency or during regeneration.
Motor rated freq. (Hz) ×(Rated speed(RPM) – Motor No. of poles)
•
Motor rated slip (Cn-11) =
Max-voltage freq (Cn-04) ×120
×100%
Cn-11
Cn-02Cn-04
Cn-11
Cn-02
Cn-04
Fig. 20 Slip compensation limit
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