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3-41
Servo Driver Regenerative energy
Internal regeneration resistance
(J) that can be
absorbed by internal
capacitor (See note 1.)
Average amount of
regeneration that can
be absorbed (W)
Resistance (Ω)
R88D-WTA3HL 7.8 – –
R88D-WTA5HL 15.7 – –
R88D-WT01HL 15.7 – –
R88D-WT02HL 15.7 – –
R88D-WTA3H 18.5 – –
R88D-WTA5H 18.5 – –
R88D-WT01H 37.1 – –
R88D-WT02H 37.1 – –
R88D-WT04H 37.1 – –
R88D-WT05H – 12 50
R88D-WT08H – 12 50
R88D-WT10H – 12 50
R88D-WT15H – 14 30
R88D-WT20H – 28 25
R88D-WT30H – 28 12.5
R88D-WT50H – 56 8
R88D-WT60H – – –
R88D-WT75H – – –
R88D-WT150H – – –
Note 1. These are the values at 100 V AC for 100-V AC models, and at 200 V AC for 200-V AC models.
Note 2. The R88D-WT60H to R88D-WT150H models do not have built-in regeneration resistor. External resis-
tance must be connected according to the amount of regeneration.
3-3-3 Regenerative Energy Absorption by External
Regeneration Resistance
If the regenerative energy exceeds the absorption capacity of the Servo Driver by itself,
then external regeneration resistance must be connected. That resistance can be pro-
vided by either an External Regeneration Resistor or an External Regeneration Resis-
tance Unit (for the R88D-WT60H to R88D-WT150H). A Resistor or Unit can be used
alone or in combination with other Resistors/Units to provide the required regeneration
processing capacity.
Caution Connect the External Regeneration Resistor or External Regeneration Resistance
Unit between the Servo Driver’s B1 and B2 terminals. Check the terminal names
carefully when connecting to the terminals. If the Resistor or Unit is connected to the
wrong terminals it will damage the Servomotor.
Note 1. The External Regeneration Resistor can reach a temperature of approximately 120°C, so
install it at a distance from heat-sensitive devices and wiring. In addition, a radiation shield
must be installed according to the radiation conditions.
System Design and Installation
Chapter 3
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