Regen Resistor Theory; Regen Specifications; 1: Amplifier Regen Circuit Output Specifications; 2: Copley Standard Regen Resistor Specifications - Copley Controls Xenus XSL-230-36 Regeneration Manual

Regen Resistor Sizing and Configuration

1.1: Regen Resistor Theory

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
2
I 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.
If too much energy is added to the capacitor bank, the voltage will rise to a point where the
amplifier's over voltage protection will shut down the amplifier. To prevent this, a regen circuit
shunts some of the energy into an external resistor, known as a regen resistor, when the voltage
rises too high.
Xenus provides an internal transistor that is used in combination with an external resistor. Copley
Controls supplies compatible external resistors. When using a resistor acquired from another
source, be sure it meets the specifications described in
Regen Resistor Sizing and Configuration (p.
The amplifier protects the regen circuit against short circuit, and uses I
algorithms to protect both the external resistor and internal transistor.

1.2: Regen Specifications

This section describes the regen resistor specifications.

1.2.1: Amplifier Regen Circuit Output Specifications

Model
Continuous Power
Peak Power
Minimum Resistance
Minimum Resistor Wattage
Turn On Voltage
Turn Off Voltage
DC Bus Capacitance
Regen Energy Absorption Capacity
Input Voltage 120 Vac

1.2.2: Copley Standard Regen Resistor Specifications

Model Resistance
XSL-RA-01 30 ohms
XSL-RA-02 15 ohms
2
9).
XSL-230-18
2 kW
5 kW
30
25 W
+390 Vdc
+380 Vdc
1760 µF nominal
108 joules
208 Vac 57 joules
240 Vac 32 joules
Continuous Power
167 W
200 W
Xenus Regeneration Guide
2
T peak current/time
XSL-230-36
4 kW
10 kW
15
50 W
Peak Power
5 kW
10 kW
XSL-230-40
For Use With
XSL-230-18
XSL-230-36
XSL-230-40
Copley Controls Corp.