Toshiba VF-FS1 - Manual (Page 126)

E6581381
F-30
6
* The currents in the above figure are used as the basis to make calculations for inverter overload trip (QN).
* If H is set to or , QER trip will occur when the current increases and reaches the level above
which the carrier frequency is decreased automatically.
* Random control is exercised when the motor is operated in a low-frequency range where it produces
annoying magnetic noise.
If the carrier frequency (H) is set above 7.1 kHz, the random control function will not be performed,
because the level of motor magnetic noise is low at high frequencies.
* When the carrier frequency control mode selection (H) is set to or , the carrier frequency (H)
should be set preferably 6 kHz. Otherwise the output voltage may drop.