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12 Appendix
12.2.2 Calculating the Regenerative Energy
12-8
If the above calculation determines that the amount of regenerative power (Wk) 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, then install an
external regenerative resistor for the capacity obtained from the above calculation.
If the energy consumed by load 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 calcula-
tion procedure in order to find the required capacity (W) for the regenerative resistor.
• Energy for continuous regeneration mode operation period: E
G
(joules)
Here, E
G
= V
MG
T
G
t
G
• V
MG
: Linear servomotor speed (m/s) for same operation period as above
• T
G
: Linear servomotor’s generated force (N) in continuous regenerative mode operation period
• t
G
: Same operation periods as above
• Energy consumed by a 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)