MicroHarmony Cell Sizes 40 - 260A Manual
Application Notes
19001467: Version 1.0
9-17
s
9
where,
N = number of ranks in the drive (or the total number of cells = 3*N),
Vcell = 750,
Tap = 1.00 (for 0% tap), 0.95 (for +5% tap) or 1.05 (for -5% tap)
Vin = actual input line voltage,
Vin,rated = rated drive input voltage
M = 1.00 min (unity) to 1.08 max (over modulation)
9.9.2
Output Voltage capability after bypass
Vout_bypass = Vout * (2N - X) / 2N,
where,
Vout = maximum output voltage with all cells operating
X = largest number of cells in bypass in two of the three phases
N = number of cells connected in series
9.9.3
Example of calculating Drive Output Voltage capability
Consider a drive with 9 cells each rated for 750V.
The maximum output voltage that this drive can deliver on the 0% tap with rated line voltage and 4% over
modulation
(N = 3, Vcell = 750, Tap = 1.00, M = 1.04) is:
Vout = 1.78 x 3 x 750 x 1.0 x 1.0 x 1.04 = 4.165 kV.
Now, if after cell bypass, the drive has 3 cells operational in phase A, 2 cells in phase B, and 1 cell in phase C, then
the maximum voltage that the drive can produce with neutral shift from the above formula is (with X = 1 + 2 = 3,
because 1 cell in phase B and 2 cells in phase C are bypassed),
Vout_bypass = 4165 x (2 x 3 - 3) / (2 x 3) = 2.082 kV
9.10 Output Current Capability
Amps = HP x 746 / (Volts x 1.73 x Eff x PF)
Where,
Amps = motor current
HP = motor horsepower
Volts = motor line to line rms voltage
EFF = motor efficiency
PF = motor power factor
9.11 Output Frequency and Switching Frequency
Fc = 3.6 x Fo
Where,
Fc = switching frequency
Fo = output frequency
Fc, default: 600Hz Fo, default max: 167Hz
Fc max:
1200Hz Fo max:
330Hz
Default switching frequency is 600Hz, which can produce up to 600 / 3.6 = 167Hz output frequency. Beyond 600Hz
requires current de rating.
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Страница 10: ...Safety Precautions and Warnings MicroHarmony Cell Sizes 40 260A Manual viii 19001467 Version 1 0 s ...
Страница 16: ...Cell Overview MicroHarmony Cell Sizes 40 260A Manual 1 6 19001467 Version 1 0 s 1 ...
Страница 36: ...Installation MicroHarmony Cell Sizes 40 260A Manual 3 4 19001467 Version 1 0 s 3 ...
Страница 42: ...Electrical Description MicroHarmony Cell Sizes 40 260A Manual 4 6 19001467 Version 1 0 s 4 ...
Страница 56: ...Repair Hints MicroHarmony Cell Sizes 40 260A Manual 8 4 19001467 Version 1 0 s 8 ...
Страница 76: ...Drive Calc Express MicroHarmony Cell Sizes 40 260A Manual 10 2 19001467 Version 1 0 s 10 ...
Страница 86: ...Communication Protocol MicroHarmony Cell Sizes 40 260A Manual 11 10 19001467 Version 1 0 s 11 ...
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