LS ELECTRIC LSLV-H100 Series, User Manual

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Applying Drives to Single-
phase Input Application
583
12.3 Input Frequency and Voltage Tolerance
The single-phase current ratings are valid for 60Hz input only.
For single-phase input AC voltage, products with 90 kW or less are within -5% to + 10% of
240/480 Vac. Products with 110 kW or more are in the range of -5% to + 10% of 380/500
Vac. Standard product with three-phase voltage input has an allowable range of +10% to
–
15%. Therefore, a stricter input voltage tolerance of +10 to
–5% applies when using the
drive with a single-phase supply. The average bus voltage with single-phase input is lower
than the equivalent of a three-phase input.
Therefore, the maximum output voltage (motor voltage) will be lower with a single-phase
input. The minimum input voltage must be no less than 228Vac for 240 volt models and
456Vac for 480 volt models, to ensure motor voltage production of 207Vac and 415Vac,
respectively.
Thus, if full motor torque must be developed near base speed (full power) it will be
necessary to maintain a rigid incoming line voltage so that adequate motor voltage can be
produced. Operating a motor at reduced speed (reduced power), or using a motor with a
base voltage that is lower than the incoming AC supply rating (ex. 208Vac motor with a
)