Internal Shunt Option [-Si#]; Table 2-3: Maximum Energy That The Xr3 Can Safely Absorb During Regeneration - Aerotech XR3 Hardware Manual

XR3 Hardware Manual

2.2.4. Internal Shunt Option [-SI#]

The internal shunt option is used to limit the internal bus voltage caused by regeneration. Regeneration
occurs during deceleration as mechanical energy is converted to electrical energy and stored in the internal
power supply capacitors. Regeneration only occurs with PWM amplifier types (XSP3) and not linear
amplifier types (XSL3).
The maximum amount of energy that the XR3 can safely absorb depends on the line voltage and motor bus
configuration as shown in
Table 2-3: Maximum Energy That The XR3 Can Safely Absorb During Regeneration
Bus Option
VB7 - with split bus
VB7 - without split bus
VB8 - with split bus
VB8 - without split bus
To determine if the shunt option is required, use one of the equations that follow to calculate the stored
mechanical energy. If the calculated value exceeds the value listed in
For multiple axes, add the energy contribution for each axis that shares a power supply and decelerates
simultaneously. Compare the sum against the maximum energy limits shown in
For Linear Axes:
m moving mass [kg]
v speed [m/s]
E stored energy [J]
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Table 2-3.
Input Voltage
125 VAC
125 VAC
240 VAC
240 VAC
Chapter 2: Installation and Configuration
Internal Capacitance
8000 uF / 200 VDC
16000 uF / 200 VDC
2300 uF / 400 VDC
4600 uf / 400 VDC
Table 2-3, the shunt option is required.
For Rotary Axes:
J inertia [kg·m 2 ]
w speed [rad/s]
E stored energy [J]
Energy (J)
35
70
52
104
Table 2-3.
33