Operational Theory
Xenus XTL User Guide
42
Copley Controls Corp.
2.15: Regen Resistor Theory
2.15.1: Regeneration
When a load is accelerated electrical energy is converted into mechanical energy. During
deceleration the conversion is reversed. This is called regeneration. Some of this regenerated
energy is lost to friction in the mechanical system. More of this energy is converted to heat due to
I
2
R losses in the motor windings, cabling, and drive electronics. The remainder of the energy is
added to the electrical energy already stored in the internal capacitor bank of the amplifier. The
result of this energy being added is an increase in the voltage on the capacitor bank.
2.15.2: Regen Resistor
If too much energy is added to the capacitor bank, the voltage rises to a point where the
amplifier's over voltage protection shuts down the amplifier. To prevent this, a regen circuit shunts
some of the energy into an external regen resistor when the voltage rises too high.
2.15.3: Regen Circuit Components
The amplifier provides an internal transistor that is used in combination with an external resistor.
Copley Controls supplies compatible resistors as described in
Regen Resistor Assemblies (p.
177)
. When using a resistor acquired from another source, be sure it meets the specifications
described in
Regen Resistor Sizing and Configuration
(p. 145)
.
2.15.4: Regen Circuit Protections
The amplifier protects the regen circuit against short circuit, and uses I
2
T peak current/time
algorithms to protect both the external resistor and the internal transistor.
2.15.5: Configurable Custom Resistor
The following values can be entered for a custom resistor using CME 2:
Option Description
Resistance Value
Value in ohms of the resistor
Continuous Power
Continuous power rating of the resistor
Peak Power
Peak power rating of the resistor
Time at Peak Power
Time at peak power of resistor
For more information, see
Regen Resistor
(p. 102)
and
Regen Resistor Sizing and Configuration
(p. 145)
Summary of Contents for Xenus XTL
Page 1: ...Xenus XTL User Guide P N 95 00875 000 Revision 3 June 2008...
Page 2: ...Xenus XTL User Guide This page for notes...
Page 8: ...About this Manual Xenus XTL User Guide 8 Copley Controls Corp This page for notes...
Page 12: ...Introduction Xenus XTL User Guide 12 Copley Controls Corp...
Page 51: ...Xenus XTL User Guide Specifications Copley Controls Corp 51 3 24 Dimensions...
Page 52: ...Specifications Xenus XTL User Guide 52 Copley Controls Corp...
Page 72: ...Wiring Xenus XTL User Guide 72 Copley Controls Corp...
Page 158: ...Regen Resistor Sizing and Configuration Xenus XTL User Guide 158 Copley Controls Corp...
Page 172: ...Xenus Filter Xenus XTL User Guide 172 Copley Controls Corp...
