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C.1.4 Fuse Selection
The BUS MDA10 slow blow fuse or equivalent is recommended
when the 6415 is set for 5 Amps. Fuses from the same family
but with proportionally lower current rating can be used with
lower current settings.
C.1.5 Regeneration Considerations
The motor power supply voltage can be "pumped up" when the
motor and load are decelerated by the drive. In effect, the motor
becomes a generator converting mechanical energy stored in the
spinning motor and load inertia into electrical energy. If the
mechanical energy is less than the losses in the drive and motor,
the supply voltage does not increase. If the mechanical energy is
greater than these losses, the supply voltage will increase (be
pumped up).
The mechanical energy of a spinning inertia is given by:
where:
Final voltage
If this energy is converted to electrical energy in the form of
charge on the bus capacitor(s), the voltage will be:
where:
6415 Installation & Hardware Reference Manual - Rev E
-5
2
E = 3.87 * 10
* J * S
E = kinetic energy (joules)
J = inertia in oz-in-sec
S = speed in rpm
E
2
+
V = V
O
C
V is the final voltage (after energy transferred to
capacitor(s)
V
is the initial voltage
o
C is the total capacitance in farads
E is the initial kinetic energy in joules
2
C - 7
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