4 System Design
4 - 42
OMNUC G5-series (Pulse-train Input Type) AC Servomotors and Servo Drives User’s Manual
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 temperature of the External Regeneration Resistor will rise up to approximately 120°C. Do not
place it near equipment and wiring that is easily affected by heat. Attach radiator plates suitable for the
heat radiation conditions.
 Characteristics
4-4-3 Regenerative Energy Absorption with an External Regeneration
Resistor
External Regeneration Resistors
Model
Resistance
value
Nominal
capacity
The amount of
regeneration
absorption for 120
temperature rise
Heat radiation
condition
Thermal switch output
specifications
R88A-
RR08050S
50 Ω 80 W 20 W Aluminum
350 x 350,
Thickness: 3.0
Operating temperature:
150 ± 5°C
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 x 350,
Thickness: 3.0
Operating temperature:
150 ± 5°C
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 x 350,
Thickness: 3.0
Operating temperature:
170 ± 7°C
NC contact
Rated output (resistive load):
250 VAC, 3 A max.
R88A-
RR22047S1
47 Ω 220 W 70 W Aluminum
350 x 350,
Thickness: 3.0
Operating temperature:
150 ± 5°C
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 x 600,
Thickness: 3.0
Operating temperature:
200 ± 7°C
NC contact
Rated output (resistive load):
250 VAC, 0.2 A max.
42 VDC, 0.2 A max.
(minimum current: 1 mA)
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