3-1-4．Regenerative Resistor
When the servo motor operates in generator mode, power is returned to the servo drive side. This is
called regenerative power. The regenerative power is absorbed by charging the smoothing capacitor,
but when the capacitor’s charging limit is exceeded, the regenerative power needs to be reduced by the
regenerative resistor.
The servomotor is driven in regeneration (generator) mode in the following conditions:
From decelerating to stop for acceleration/deceleration operation.
Move down on the vertical axis.
The external load drives the motor running
Regenerative resistor connection terminals
DS3-4□P□-PQA
DS3E-2□P□-PFA
DS3E-4□P□-PFA
DS3L-2□P□-PFA
DS3L-4□P□-PFA
DS3-2□P□-PTA
DS3-4□P□-PTA
for internal regenerative resistor: short P+ and D, disconnect P+ and C,
P0-24=0.
for external regenerative resistor: connect resistor between P+ and C,
disconnect P+ and D, P0-24=1, P0-25=power value, P0-26=resistor value.
Choose
regenerative
resistor
Use internal regenerative resistor
Use external regenerative resistor
(resistor type please refer to the
following table)
1. self-cooling mode (natural convection cooling):
below 20% of regenerative resistor capacity (W)
2. forced air cooling: below 50% of regenerative
resistor capacity (W)
The type of regenerative resistor:
(cannot smaller than
this value)
External regenerative
resistor (recommend
value)
External regenerative
resistor (recommend
power)
DS3E-20P2-PFA
DS3L-20P2-PFA
DS3-20P2-PTA
DS3E-20P4-PFA
DS3L-20P4-PFA
DS3-20P4-PTA
DS3E-20P7-PFA
DS3L-20P7-PFA
DS3-20P7-PTA
DS3E-21P5-PFA
DS3L-21P5-PFA
DS3-21P5-PTA
DS3E-22P3-PFA
DS3L-22P3-PFA
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