ABB HIEE405246R0002 Redundant channel module
Load regulation must also be accounted for when selecting the transformer. Transformers are designed to produce their specified secondary voltage when loaded by their rated current. For currents less than rated, the secondary voltage will increase This means that the secondary voltage of a 100 VA transformer will increase 10% over the specified voltage if the load current is reduced from rated current to zero. Since the stepper drive(s) might sometimes be disabled, the full regulation effect as well as maximum line voltage should be considered when selecting the transformer.
Current Rating
The average current load of the 6410 is a function of the motor used as well as motor speed and torque. To optimize the power supply design, the supply current can be measured using a DC current meter when the motor is producing the highest shaft power. If it is difficult to make this measurement, assume the maximum average load current equals the selected phase current. Thus, if the DIP switch is set for 5 Amps RMS, assume the maximum average power supply current is 5 amps.
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