4-57
4-4 Regenerative Energy Absorption
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
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 External Regeneration Resistor will heat up to approx. 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.
External Regeneration Resistor
Characteristics
Model
Resistance
value
Nominal
capacity
Regeneration
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-
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 (resistive
load): 250 VAC, 0.2 A max.
42 VDC, 0.2 A max.
(minimum current: 1 mA)
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