28Overload Characteristic Load [%]2.7 Low Speed OverloadPermanentcurrent(0 Hz)(E.OL2)230V Maximum stall current (amps at 0Hz)Inverter Carrier Inverter SizeHousing Frequency 13 14 15 16 17 18 19 20 21E 8 kHz 24 2416 kHz 16.8 16.8G 8 kHz 33 3116 kHz 33 26H 8 kHz 53 72.5 1016 kHz 53 73 2R 8 kHz 84 100 115 145 18016 kHz 50 70 70 102 102460V Maximum stall current (amps at 0Hz)Inverter Carrier Inverter SizeHousing Frequency 13 14 15 16 17 18 19 20 21 22 23 24 26 26E 8 kHz 12 17 1716 kHz 12 10 10G 8 kHz 12 17 1 22.016 kHz 12 12 8.4 .5H 8 kHz 24 33 42 50 54 8316 kHz 15 20 25 30 36 45R 8 kHz 50 60 75 81 115 16516 kHz 40 27 34 45 63 1504 kHz 165 18 330 330U 8 kHz 150 180 180 22516 kHz - - -At low speeds (below 3 Hz) the rms current flowing through the power transistors is higher,reaching 1.4 times the rated 60Hz rms value. This is caused by the low frequency sine wave cre-ated by the PWM. As a result, the continuous output current must be limited at low speeds to pre-vent the power transistors from overheating. The COMBIVERT F5 will drop the carrier frequencyto 4kHz if necessary to be able to continue to provide current to the motor. Once the output fre-quency rises above 3Hz or the current drops below the levels listed below, the carrier frequencywill be returned to the higher value.
