26
Fixed frequencies
1...3
Input I1
Input I2
Input I1 and I2
Three fixed frequencies can be adjusted. The fixed frequencies are selected
with the inputs I1 (terminal 10), I2 (terminal 11) and I1 + I2.
Adjustment range:
-400...400 Hz
Resolution:
0.0125 Hz
Factory setting, CP.19:
5 Hz
Factory setting, CP.20:
50 Hz
Factory setting, CP.21:
70 Hz
If the adjusted values are outside of the fixed limits of CP.10 and CP.11,
then the actual run frequency is internally limited to the values of CP.10
and CP.11. The negative rotation values (i.e. -50Hz) are only available in
the "application mode". The rotation source of the fixed frequencies is not
changed by CP.34, it always corresponds to CP.34 = 2 (Fwd/Rev direction
selectable by terminal 14 or 15).
Adjustment range :
2/4/8/12/16 kHz
Resolution:
1
Factory setting:
_
(depending on power circuit)
Note:
Enter-Parameter
Low Switching Frequency
Lower inverter heating
Lower High Freq. ground current
Reduced power loss
Lower radio interferences
Reduced cogging at low speed
High Switching Frequency
Less audible noise produced
Improved sine-wave simulation
Less motor losses
Carrier frequency
The frequency with which the power modules are switched can be changed
depending on the application. The employed power stage determines the
maximum switching frequency as well as the factory setting. Generally,
the inverter can operate at frequencies higher than the rated value but not
under continuous load.
Special Adjustments
At switching frequencies above 4 kHz pay absolute attention to the
max. motor cable length especially when using shielded cables.
