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Installation and Configuration
2.9. -EXTSHUNT Option (TB101)
While decelerating a mechanical load, the mechanical energy is converted into electrical energy. This energy
charges the internal bus filter capacitor in the amplifier. A shunt circuit prevents the bus voltage from rising
too high and causing damage to the amplifier.
The Ensemble HPe 150/200 provides an external shunt option for high-energy systems. Internally, the shunt
is fused with an 8A slow-blow type fuse. The purpose of the fuse is to protect the electronic switching device
and the traces on the circuit board.
Table 2-38:
Recommended Shunt Resistors and Wire Gauge
Component
Recommendation
Power Resistor
Milwaukee Resistor Corporation's rib wound resistors
The following is a list of parameters required to calculate the external shunt resistor value:
V
= point at which the shunt circuit turns on – 380 V
M
V
= approximately 10 V
HYS
Bus capacitance = 4,700 uF
The first step in sizing the external shunt resistor is to calculate the kinetic energy of the system. Use
Equation 1 to calculate the kinetic energy minus system losses.
Equation 1:
. 1
356
[
]
=
+
ω
−
2
E
J
J
M
M
L
m
2
J
= rotor inertia (lb-ft-sec
M
J
= load inertia (lb-ft-sec
L
ω
= motor speed before deceleration (radians/sec) = RPM/9.55
m
I
= motor current during deceleration (A
M
R
= motor resistance (Ω line-to-line)
M
t
= time to deceleration (seconds)
D
t
= friction torque (lb-ft)
F
www.aerotech.com
R
. 1
356
−
ω
2
M
I
t
T
t
3
M
D
F
m
D
2
2
2
)
2
)
Chapter 2
Ensemble HPe 150/200
per phase)
RMS
Recommended Wire Size
2
1.3 mm
(#16 AWG)
63
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