Regenerative Braking Unit (Model: 3G3Ax-Rbu); Specifications - Omron RX2 Series User Manual

11-2 Regenerative Braking Unit
(Model: 3G3AX-RBU)

11-2-1 Specifications

Built-in Resistor Type (Model: 3G3AX-RBU21/RBU22/RBU41)
Applicable voltage class
Model
Connection resistance
Operating voltage (ON/OFF)
Operation indication
Maximum number of units for paral-
lel interlocking operation
Internal resistance
Allowable continuous
ON time
Built-in
resistor
Allowable operation
cycle
Power consumption
Protective Built-in resistor over-
function heat protection
Operating ambient
temperature
Storage ambient tem-
perature
Operating
Operating ambient
environment
humidity
Vibration resistance
Location
Paint color
*1. To use the braking resistor (Model: 3G3AX-RAB/RBB/RBC) for the 400-V class regenerative braking unit, be sure to remove
the built-in resistor and connect two resistors of the same model in series. Using a 400-V class regenerative braking unit
with only a single braking resistor connected may cause damage to the braking resistor.
*2. Use DIP switches to set the number of connected units.
*3. The built-in resistor has a thermal fuse. If the alarm terminals are not connected, the fuse may blow out in order to prevent
the resistor from burning due to overheating. If the fuse blows out, the built-in resistor must be replaced.
High-function General-purpose Inverter RX2 Series User's Manual
3G3AX-RBU21
17  min.
ON: 362.5 ± 5 V
OFF: 355 ± 5 V
(–5% or –10% setting available)
LED ON (Lit)
5 units
*2
120 W, 180 
10 s max.
Cycle 1/10
(ON for 10 s/OFF for 90 s)
Instantaneous: 0.73 kW
Short-time rating: 120 W
Built-in relay specifications
· Built-in resistor temperature: Relay is activated at approximately 200°C or higher
· Built-in thermal fuse (No resetting)
· Contact rating: 250 VAC 200 mA (R load)
12 VAC 500 mA (R load)
42 VDC 200 mA (R load)
· Minimum load: 1 mA
–10 to 50°C
–20 to 65°C
20% to 90% (with no condensation)
2
5.9 m/s (0.6 G) 10 to 55 Hz
At a maximum altitude of 1,000 m (without corrosive gases or dust)
Munselle 5Y7/1 (except for cooling fan with aluminum base color)
3-phase 200-V class
3G3AX-RBU22
17  min.
120 W, 20 
0.5 s max.
Cycle 1/80
(ON for 0.5 s/OFF for 40 s)
Instantaneous: 6.6 kW
Short-time rating: 120 W
and reset at approximately 170°C or lower.
*3
11 Options
3-phase 400-V class
*1
3G3AX-RBU41
34  min.
ON: 725 ± 5 V
OFF: 710 ± 5 V
(–5% or –10% setting avail-
able)
120 W, 180 
x 2 in series
10 s max.
Cycle 1/10
(ON for 10 s/OFF for 90 s)
Instantaneous: 1.46 kW
Short-time rating: 240 W
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