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Power supply design must insure that the voltage between J2-2
and J2-1 never exceeds 75 volts under any operating conditions.
These conditions include high line voltage, transformer
regulation effects, voltage spiking due to current switching
within the module and regeneration. Failure to do this can
result in permanent damage to the 6415.
C.1.1 Line Transformer Selection
Primary voltage
Make sure that the transformer is guaranteed to operate at the
and frequency
highest line voltage combined with the lowest line frequency that
rating
will ever be used to power your system. Failure to do so can
result in saturation, large current increases and winding failure.
Secondary
Maximum motor speed performance will be achieved by using as
voltage rating
high a motor supply voltage as possible without ever exceeding
75 volts. Of course lower voltages can also be used (so long as
the voltage is greater than the minimum specified value of 24
volts) but motor torque will drop more rapidly as speed increases.
The peak bus voltage (excluding any spiking due to current
switching in the drive module or any regeneration effects) is
approximately equal to:
Note: This assumes a 0.75 volt drop across each rectifier diode.
To insure this, as well as to discharge the bus capacitor when AC
power is removed, it is recommended that a bleed resistor be
placed across each bus capacitor as shown.
C - 2
Warning
(1.414 * Actual Secondary rms voltage) - 1.5
6415 Installation & Hardware Reference Manual - Rev E
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