Sigmatek FDD Sizes 7 to 9 Power Installation Guide
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5.1.16
Accuracy and resolution
Frequency:
The absolute frequency accuracy depends on the accuracy of the oscillator used with the drive
microprocessor. The accuracy of the oscillator is ± 0.02 %, and so the absolute frequency accuracy
is ± 0.02 % of the reference, when a preset frequency is used. If an analog input is used, the absolute
accuracy is further limited by the absolute accuracy of the analog input.
The following data applies to the drive only; it does not include the performance of the source of the
control signals.
Open & closed loop resolution:
Preset frequency reference: 0.01 Hz
Analog input 1: 11 bit plus sign
Analog input 2: 11 bit
Current:
The resolution of the current feedback is 10 bit plus sign.
Accuracy: typical 2 %
worst case 5 %
5.1.17 Acoustic noise
The heatsink fan generates the majority of the sound pressure level at 1 m produced by the drive. The
heatsink fan is a variable speed fan. The drive controls the speed at which the fan runs based on the
temperature of the heatsink and the drive's thermal model system.
Table 5-9 gives the sound pressure level at 1 m produced by the drive for the heatsink fan running at
the maximum and minimum speeds.
Table 5-9 Acoustic noise data
Size
Max speed
dBA
Min speed
dBA
7
66.8
49.6
8
67.9
49.8
9
75
52.6
Summary of Contents for 074.00660
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