4-48
4-4 Regenerative Energy Absorption
System Design
4
Absorbing Regenerative Energy with an External Regeneration
Resistor
If the regenerative energy exceeds the 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 Servo Drive may be
damaged by burning if connected to the wrong terminals.
The External Regeneration Resistor will heat 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.
External Regeneration Resistor
Performance Specifications
Model
Resistance
Nominal
capacity
Regeneration ab-
sorption at 120
°
C
Heat radiation
condition
Thermal switch output
specifications
R88A-RR08050S
50
Ω
80 W
20 W
Aluminum,
250
×
250,
Thickness: 3.0
Operating tempera-
ture: 150
°
C
±
5%
NC contact
Rated output:
30 VDC, 50 mA max.
R88A-RR080100S
100
Ω
80 W
20 W
Aluminum,
250
×
250,
Thickness: 3.0
Operating tempera-
ture: 150
°
C
±
5%
NC contact
Rated output:
30 VDC, 50 mA max.
R88A-RR22047S
47
Ω
220 W
70 W
Aluminum,
350
×
350,
Thickness: 3.0
Operating tempera-
ture: 170
°
C
±
7
°
C
NC contact
Rated output:
250 VAC, 0.2 A max.
R88A-RR50020S
20
Ω
500 W
180 W
Aluminum,
600
×
600,
Thickness: 3.0
Operating tempera-
ture: 200
°
C
±
7
°
C
NC contact
Rated output:
250 VAC, 0.2 A max.
24 VDC, 0.2 A max.