
ECO REFERENCE MANUAL
13-14
•
Pulse frequency
0 - 7
[0]
Sets the pulse frequency (from 2 to 16 kHz)
and the PWM mode. If silent operation is not
absolutely necessary, the losses in the inverter
as well as the RFI emissions can be reduced
by selecting lower pulse frequencies.
0/1 = 16 kHz (230 V default)
2/3 = 8 kHz
4/5 = 4 kHz (400 V default)
6/7 = 2 kHz
Even numbers = normal modulation technique.
Odd numbers = lower loss modulation
technique used when operating mainly at
speeds above 5 Hz. (Not generally for fan
and pump applications)
Due to higher switching losses at increased frequencies, certain inverters may have their maximum
continuous current (100%) derated if the switching frequency is changed from the default value.
Model
% of full load de-rating
16 kHz
8 kHz
MICROMASTER
ECO1-110/3
50
80
ECO1-150/3
50
80
ECO1-220/3
80
100
ECO1-300/3
50
80
ECO1-400/3
50
80
ECO1-550/3
50
80
ECO1-750/3
50
80
If switching frequency is 2 kHz or 4 kHz then derating does not occur on the above
inverters.
Model
% of full load de-rating
16 kHz
8 kHz
MIDIMASTER
ECO1-550/2
60
90
ECO1-750/2
55
90
ECO1-1100/2
64
90
ECO1-1500/2
60
100
ECO1-1850/2
47
80
ECO1-2200/2
43
79
ECO1-1100/3
57
90
ECO1-1500/3
50
83
ECO1-1850/3
64
90
ECO1-2200/3
55
75
ECO1-3000/3
50
90
ECO1-3700/3
47
88
ECO4500/3
40
75
ECO1-750/4
75
100
ECO1-1100/4
55
100
ECO1-1500/4
39
75
ECO1-1850/4
64
90
ECO1-2200/4
55
75
On all FS6 575V and all FS7 MIDIMASTER Eco inverters, the switching frequency can
only be either 2kHz or 4kHz.