Xenus XSL User Guide
Regen Resistor Sizing and Configuration
Copley Controls Corp.
157
A.1.10: Calculate Continuous Power to be Dissipated
Use the following formula to calculate the continuous power that must be dissipated by the regen
resistor. Use each deceleration where energy is dissipated by the regen resistor.
P
cont
= ( E
regen 1
+ E
regen 2
+ E
regen …
) / T
cycle
Where:
P
cont
= The continuous power that will be dissipated by the resistor in watts.
E
regen n
= Energy being dissipated during decelerations, in joules.
T
cycle
= Total cycle time in seconds.
Choose a resistor with a power rating equal to or greater than the calculated continuous power.
Verify that the calculated power value is less than the continuous regen power rating specified in
Regen Circuit Output (p. 51)
.
A.1.11: Select Fuses
For custom regen resistors, Cooper Bussman KLM fuses, or equivalent, should be selected. The
peak and continuous currents, as well as the peak current time, must be taken into consideration
for proper fuse selection. The duration of the peak current is the deceleration time (T
decel
)
associated with the maximum pulse power regen event.
Use the following formulas to determine the minimum peak and continuous current ratings of the
fuse. For related amplifier specifications, see
Regen Circuit Output (p. 51)
.
The peak current is determined by the chosen regen resistor value.
I
peak
= V
regen
/ R
regen
Where:
I
peak
= The current though the regen resistor during regeneration in amps.
V
regen
= The voltage at which the regen circuit turns on.
R
regen
= The resistance value of the chosen regen resistor in ohms.
The continuous current is determined by the continuous regen power.
I
cont
= P
cont
/ V
regen
Where:
I
cont
= The minimum continuous current rating the fuse requires in amps.
P
cont
= The continuous power calculated in the previous step
,
in watts.
V
regen
= The voltage at which the regen circuit turns on.
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