Yaskawa FSP Amplifier - Manual (Page 343)

FSP Amplifier User’s Manual Appendix C: Specifications for Peripheral Devices
C-12
If the previous calculation determines that the amount of regenerative power
(W
k
) that can be processed by the built-in resistor is not exceeded, then an
external regenerative resistor is not required.
If the amount of regenerative power that can be processed by the built-in resistor
is exceeded, install an external regenerative resistor for the capacity obtained
from the above calculation.
If the energy consumed by load system loss (in step 2 above) is unknown, then
perform the calculation using E
L
= 0.
When the operation period in regeneration mode is continuous, add the
following items to the above calculation procedure in order to find the required
capacity (W) for the regenerative resistor.
• Energy for continuous regeneration mode operation period: E
G
(joules)
• Energy consumed by regenerative resistor: E
K
=
E
S
- (E
L
+ E
M
+ E
C
) + E
G
• Required capacity of regenerative resistor: W
K
= E
K
/ (0.2 ⋅ T)
Here, E
G
= (2
π
/60) N
MG
x τ
G
⋅ t
G
• τ
G
: Servomotor’s generated torque [oz·in (N·m)] in continuous regeneration
mode operation period.
• N
MG
: Servomotor rotation speed (rpm) for same operation period as above.
• t
G
: Same operation period (s) as above.
Servo Amplifier’s Absorbable Energy
The following diagrams show the relationship between the servo amplifier’s
input power supply voltage and its absorbable energy.
• FSP Amplifier for 100 V motor