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Ensemble HPe 150/200
A shunt resistor is required if the calculated energy is more than the internal bus capacitor can store. Use
Equation 2 to perform this calculation.
Equation 2:
1
<
−
2
2
E
C
V
V
(
)
M
M
NOM
2
C
= Bus capacitor (Farads) (= 4,700 uF)
V
= turn on voltage for shunt circuit (V) (=380 V)
M
V
= nominal Bus voltage (V) (160 V or 320 V Typical)
NOM
For a standard Ensemble HPe 150/200, the maximum energy the internal bus capacitor can store without
requiring a shunt resistor is indicated in
Table 2-39:
Maximum Storage Energy
Bus Voltage
160 V
320 V
If a shunt resistor is required, the next step is to calculate the value of resistance necessary to remove the
energy. Use Equations 3, 4, and 5 to calculate the size of the shunt resistor.
Equation 3:
2
V
=
M
R
(Ω)
MAX
P
PEAK
V
= turn on voltage for shunt circuit (V) (= 380 V)
M
P
= peak power that the regeneration circuit must accommodate (W)
PEAK
Equation 4:
1
−
−
2
E
C
V
(
M
M
2
=
P
PEAK
t
D
E
= kinetic energy of load minus system losses (Joules)
M
C
= Bus capacitor (Farads)
V
= turn on voltage for shunt circuit (V) (=380 V)
M
V
= nominal Bus voltage (V) (160 V or 320 V Typical)
NOM
t
= time to deceleration (seconds)
D
64
Table
2-39.
2
V
)
NOM
(W)
Chapter 2
Installation and Configuration
Maximum Energy
267.3 J
94.5 J
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