Appendix G
Regeneration
The APEX615n can dissipate regenerated energy in its internal regeneration resistor. If an
APEX615n system regenerates more energy than the internal resistor can dissipate, you can
connect an external resistor between two terminals labeled V Bus+ and Regen Resistor, located
on the motor connector. The external resistor will double the dissipation capabilities of the
APEX6151 and APEX6154. To increase the APEX6152's dissipation capabilities, you can
add a resistor network, as explained later in this appendix..
The APEX6151's regeneration circuit works automatically—there are no adjustments to make.
The circuit monitors the voltage on the power bus. If regenerated energy from the motor
causes the bus voltage to rise above a threshold value, the circuit closes a switch, thus
connecting the regeneration resistor between the positive and negative sides of the power bus,
V Bus+ and VBus–. The energy is then dissipated in the resistor. During the regeneration event,
the red LED labeled Regen Active, located on the APEX615n's front panel, will be illuminated.
The next drawing shows a schematic that includes the internal regeneration resistor, terminals
for
When Do You Need an External Regeneration Resistor?
The APEX6151’s regeneration control circuit was designed to automatically deal with
regenerated power from almost all applications. Occasionally, however, an application
situation arises in which regeneration will cause more power dissipation than the internal
resistor can safely tolerate. In this situation, you can connect an external regeneration resistor
to double the power that the system can dissipate.
To determine whether or not you need an external resistor, you can use one of two methods:
• Empirical Method
• Calculation Method
Empirical Method
The empirical method uses a trial procedure to determine whether excess regeneration will
cause a regen or overvoltage fault. Operate your system (or a prototype of your system) and
observe the results of regeneration. When your system decelerates, the Regen Active LED will
be illuminated whenever regeneration turns on the internal resistor.
If the system’s regeneration levels are too high, eventually either a regen fault or an
overvoltage fault will shut down the APEX6151. (Be sure to let your system run for a long
enough time to see if the regen fault will be triggered.) At this point, you have two options:
• Modify the system’s move profile
• Install an external regeneration resistor
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
Need help?
General
