2-26
TI71M01D06-01EN 3rd Edition: 2012.12.01
Energy that can be absorbed in smoothing capacitor
The smoothing capacitor can be charged with regeneration energy until the regenerative
resistor is activated. The initial voltage of the smoothing capacitor is set to the maximum
value of the AC input voltage, V
AC (rms)
.
(
)
( )
Ｊ
−
＝
2
2
2
M
RG
C
V
V
C
E
×
( )
Ｖ
＝
AC
M
V
V
×
2
Confirmation of regenerative resistor operation
( )
Ｊ
＝
C
RC
RG
E
E
E
−
If E
RG
< 0, the regenerative resistor is not necessary.
If E
RG
> 0, the regenerative resistor is necessary.
Power consumption of regenerative resistor
The power consumed by the regenerative resistor during operation is obtained from the
following formula:
( )
Ｗ
＝
CY
RG
RG
t
E
P
Parameters for each motor and drive
The following table shows the parameters used for calculation of the regeneration power
consumption.
DR5A-300
DR5A-400 DR5A-500
Self-inertia J
M
[kg-m
2
] 0.34
0.40
0.46
Rated velocity
Nr[rps]
1.5
1.5
1.5
Maximum velocity
Nrmax[rps]
2.0
2.0
2.0
Maximum motor torque
T
M
[Nm] 300
400
500
Current at maximum torque
I
MP
[A] 50
50
50
Current - torque constant
K
IT
[Nm/A] 6
8
10
Phase-to-phase coil resistance R
AB
[
Ω］
0.39
0.507 0.61
Current - AMP loss constant
K
PL
[W/A] 4.5
4.5
4.5
Smoothing capacitor
C[
μ
F]
2800
2800 2800
Regenerative resistor
operating voltage
V
RG
[
Ω
]
385
385 385