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MA7200 PLUS Operating Manual
TECO – Westinghouse Motor Company Cn-10 - Cn-11 Parameter Details
Cn-10
Motor No-Load Current (0 – 99%)
This setting is used as a reference value for torque the 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. 9.2.2.2)
Slip compensation =
Motor rated slip (Cn-11) ×(Output current – Motor no-load current(Cn-10))
Motor rated current (Cn-09) – Motor no-load current (Cn-10)
Fig. 9.2.2.2 Output Frequency with Slip Compensation
Cn-11
Motor Rated Slip (0.0 - 9.9%)
This setting is used as a reference value for the torque compensation function (See Fig. 9.2.2.3). The setting
range is 0.0 - 9.9% of the motor maximum voltage frequency with Cn-04=100%.
The setting is shown in Fig. 9.2.2.3 in the constant torque and constant output range. If setting Cn-11 is zero,
no slip compensation is used.
There is no slip compensation when the frequency command is less than the Min. output frequency or during
regeneration.
Motor rated slip (Cn-11) =
Motor rated freq. (Hz) ×(Rated speed (RPM) – Motor No. of poles)
×100%
Max-voltage freq (Cn-04) ×120
Fig. 9.2.2.3 Slip Compensation Limit