Aerotech Ndrive HPe 10, Hardware Manual

Page: 81 / 126

Installation and Configuration Ndrive HPe 10/20/30
Equation 2:
C bus capacitor (F) [1,200 uF]
V
M
turn on voltage for shunt circuit (V) [380 V]
V
NOM
nominal bus voltage (V) [160 V or 320 V, Typical]
For a standard Ndrive HPe 10/20/30, the maximum additional energy the internal bus capacitor can store
without requiring a shunt resistor is indicated in
Table 2-50 .
Table 2-50: Maximum Additional Storage Energy
Bus Voltage Maximum Additional Energy
160 V 71.3 J
320 V 25.2 J
If a shunt resistor is required, the next step is to calculate the value of resistance necessary to dissipate the
energy. Use
Equations 3 , 4 , and 5 to calculate the parameters of the shunt resistor.
Equation 3:
P
PEAK
peak power that the regeneration circuit must accommodate (W)
t
D
deceleration time (s)
Equation 4:
P
AV
average power dissipated on shunt resistor (W)
t
CYCLE
time between deceleration events (s)
Equation 5:
V
HYS
hysteresis voltage of regeneration circuit (V) [10 V, Typical]
Additional useful equations:
1 lb·ft = 1.356 N·m
1 rad/s = 9.55 rpm
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