4-44
4-4 Regenerative Energy Absorption
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
4
System Design
Regenerative Energy Absorption with an External Regeneration
Resistor
If the regenerative energy exceeds the regeneration absorption capacity of the Servo Drive,
connect an External Regeneration Resistor.
Connect the External Regeneration Resistor between B1 and B2 terminals on the Servo Drive.
Double-check the terminal names when connecting the resistor because the drive may be
damaged if connected to the wrong terminals.
The surface of the External Regeneration Resistor will heat up to approx. 200°C. Do not place
it near equipment and wiring that is easily affected by heat. Attach radiator plates suitable for
the heat radiation conditions.
External Regeneration Resistor
Characteristics
Model
Resistance
value
Nominal
capacity
The amount of regen-
eration
absorption for 120
°
C
temperature rise
Heat
radiation
condition
Thermal switch
output specifications
R88A-
RR08050S
50 Ω 80 W 20 W Aluminum
350 × 350,
Thickness: 3.0
Operating temperature:
150°C ± 5%
NC contact
Rated output (resistive load):
125 VAC, 0.1 A max.
30 VDC, 0.1 A max.
(minimum current: 1 mA)
R88A-
RR080100S
100 Ω 80 W 20 W Aluminum
350 × 350,
Thickness: 3.0
Operating temperature:
150°C ± 5%
NC contact
Rated output (resistive load):
125 VAC, 0.1 A max.
30 VDC, 0.1 A max.
(minimum current: 1 mA)
R88A-
RR22047S
47 Ω 220 W 70 W Aluminum
350 × 350,
Thickness: 3.0
Operating temperature:
170°C ± 7°C
NC contact
Rated output: 250 VAC, 3 A
max.
R88A-
RR22047S1
47 Ω 220 W 70 W Aluminum
350 × 350,
Thickness: 3.0
Operating temperature:
150°C ± 5%
NC contact
Rated output (resistive load):
250 VAC, 0.2 A max.
42 VDC, 0.2 A max.
(minimum current: 1 mA)
R88A-
RR50020S
20 Ω 500 W 180 W Aluminum
600 × 600,
Thickness: 3.0
Operating temperature
200°C ± 7°C
NC contact
Rated output: 250 VAC, 0.2 A
max.
42 VDC, 0.2 A max.
(minimum current: 1 mA)
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