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Diagnostics Optimization CT MODBUS RTU
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310 Installation and System Design Guide
Issue Number: 1
12.12 Accuracy and resolution
Speed:
The absolute frequency and speed accuracy depends on the accuracy of the crystal used with the drive microprocessor. The accuracy of the crystal
is 100 ppm, and so the absolute frequency/speed accuracy is 100 ppm (0.01 %) of the reference, when a preset speed 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 loop resolution:
Preset frequency reference: 0.1 Hz
Precision frequency reference: 0.001 Hz
Closed loop resolution
Preset speed reference: 0.1 rpm
Precision speed reference: 0.001 rpm
Analog input 1: 11 bit plus sign
Analog input 2: 11 bit plus sign
Current:
The resolution of the current feedback is 10 bit plus sign.
Accuracy: typical 2 %
worst case 5 %
12.13 Acoustic noise
The heatsink fan generates the majority of the sound pressure level at 1 m produced by the drive. The heatsink fan on size 3 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 12-3 gives the sound pressure level at 1 m produced by the drive for the heatsink fan running at the maximum and minimum speeds.
Table 12-3 Acoustic noise data
12.14 Overall dimensions
H Height including surface mounting brackets
W Width
D Projection forward of panel when surface mounted
F Projection forward of panel when through-panel mounted
R Projection rear of panel when through-panel mounted
Table 12-4 Overall drive dimensions
Size
Max speed
dBA
Min speed
dBA
3 50.9 42.9
4 56.9 45.8
5 56.9 41.9
6 55.6 48.2
7 66.8 49.6
8 67.9 49.8
9
75 52.6
10
11 82.5 58
Size
Dimension
HWD F R
3 382 mm (15.04 in) 83 mm (3.27 in) 200 mm (7.87 in) 134 mm (5.28 in) 67 mm (2.64 in)
4 391 mm (15.39 in) 124 mm (4.88 in) 200 mm (7.87 in) 134 mm (5.28 in) 67 mm (2.64 in)
5 391 mm (15.39 in) 143 mm (5.63 in) 200 mm (7.87 in) 135 mm (5.32 in) 67 mm (2.64 in)
6 391 mm (15.39 in) 210 mm (8.27 in) 227 mm (8.94 in) 131 mm (5.16 in) 96 mm (3.78 in)
7 557 mm (21.93 in) 270 mm (10.63 in) 280 mm (11.02 in) 187 mm (7.36 in) 92 mm (3.62 in)
8 804 mm (31.65 in) 310 mm (12.21 in) 290 mm (11.42 in) 190 mm (7.48 in) 100 mm (3.94 in)
9E and 10 1069 mm (42.09 in) 310 mm (12.21 in) 290 mm (11.42 in) 190 mm (7.48 in) 99 mm (3.90 in)
11 1242 mm (48.9 in) 310 mm (12.21 in) 313 mm (12.32 in) 190 mm (7.48 in) 123 mm (4.84 in)
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