LSIS 6731001500, User Manual

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Applying
Drives to Single-phase
Input Application
624
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 240Vac supply), will also
minimize the effect of voltage deprivation. ( 240VAC Input 208V motor, 480VAC Input 400V
 
motor )