1 3 0
APEX615n Installation Guide
The total energy that must be dissipated in the regen resistor consists of the total regenerated
energy, less copper and drive losses:
W
total
=
1
2
2
π
v
max
T
(
)
−
3
2
T
k
T
2
R
−
5 2
T
k
T
t
1
To find the average power, we must consider how frequently energy is "dumped" into the
resistor. The period of the move profile is the time t
2
. Frequency and period are related by:
frequency
=
f
=
1
t
2
To find the average power dissipation in the resistor, we can multiply the equation for total
energy by the frequency, or, as shown below, we can divide by the period of the repetitive
move profile.
Finally, we obtain the equation for average power:
P
average
=
1
2
2
π
v
max
T
(
)
−
3
2
T
k
T
2
R
−
5 2
T
k
T
t
1
t
2
Substitute values from your application into this equation.
• If Paverage is less than the Continuous Power Dissipation Rating, the internal resistor is
adequate.
• If Paverage is greater than the Continuous Power Dissipation Rating, install an external
resistor.
Installing an External Regeneration Resistor
If you install an external resistor, ensure that it is adequately mounted and cooled. The internal
resistor is cooled by the APEX615n’s fan. The external resistor should be maintained at the
same temperature, or cooler, as the internal resistor. Excessive heating of the external resistor
can cause component failure.
CAUTION
Adequately cool the external resistor. Forced air cooling may be required. Maintain resistor
temperature at same or lower temperature as internal resistor.
Specifications for the internal resistor are as follows:
APEX6151:
• Resistor Size and Type
150 ohm, 95 watt, 5% non-inductive resistor:
• Manufacturer Name:
Dale
• Manufacturer Part Number:
NHL-95-16N 150 OHM
5%, 3/16 QUICK CONNECT
• Compumotor Part Name
APEX10 REGEN KIT
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