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Appendix B External Power-Dump Resistor Selection 179
Drive
Capacitance
(uF)
V
TRIP
(VDC)
E
C
(120 VAC)
Joules
E
C
(240 VAC)
Joules
AR-01xx 440 400 28 9
AR-02xx 660 400 43 14
AR-04xx 880 400 57 19
AR-08xx 1100 400 72 24
AR-13xx 1590 400 104 35
AR-20xE 2240 400 N/A 50
AR-30xE 2240 400 N/A 50
When the voltage drops below 385 VDC, the Aries drive stops dissipating power through the
power dump resistor.
Table 58 Drive Capacitor Absorption
Energy Dissipated in Motor Winding Resistance
Some energy is dissipated in the motor windings. Because the energy is
converted to wasted heat in the motor, it is referred to as copper losses.
The energy during deceleration can be derived from the inertia, deceleration
rate, motor resistance, and motor torque constant. If some of the parameters
are not known, the energy dissipated in the motor windings (E
W
) can
conservatively be assumed zero (0).
This is based on current and motor winding resistance.
()
DM
DT
LM
DMW
tR
tk
JJ
tRIE ⋅⋅
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⋅
⋅+
⋅=⋅=
2
2
2
1
2
1
ω
Where
E
W
= energy dissipated in the motor windings (Joules) – copper losses
I = current through the windings (Amps
rms
)
R
M
= line to line motor resistance (Ohms)
t
D
= deceleration time (Seconds)
J
M
= rotor inertia (kg⋅m
2
)
J
L
= load inertia (kg⋅m
2
)
k
T
= motor torque constant (Nm/Amp
rms
)
ω = rotational speed in radians per sec (1 revolution/sec =
2⋅π⋅radians/sec)