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High-function General-purpose Inverter RX2 Series User’s Manual
11-2 Regenerative Braking Unit
(Model: 3G3AX-RBU)
11
11-2-1 Specifications
11-2 Regenerative Braking Unit
(Model: 3G3AX-RBU)
11-2-1 Specifications
Built-in Resistor Type (Model: 3G3AX-RBU21/RBU22/RBU41)
Applicable voltage class 3-phase 200-V class 3-phase 400-V class
Model 3G3AX-RBU21 3G3AX-RBU22
3G3AX-RBU41
*1
*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.
Connection resistance 17 min. 17 min. 34 min.
Operating voltage (ON/OFF)
ON: 362.5 ± 5 V
OFF: 355 ± 5 V
(–5% or –10% setting available)
ON: 725 ± 5 V
OFF: 710 ± 5 V
(–5% or –10% setting avail-
able)
Operation indication LED ON (Lit)
Maximum number of units for paral-
lel interlocking operation
*2
*2. Use DIP switches to set the number of connected units.
5 units
Built-in
resistor
Internal resistance 120 W, 180 120 W, 20
120 W, 180
x 2 in series
Allowable continuous
ON time
10 s max. 0.5 s max. 10 s max.
Allowable operation
cycle
Cycle 1/10
(ON for 10 s/OFF for 90 s)
Cycle 1/80
(ON for 0.5 s/OFF for 40 s)
Cycle 1/10
(ON for 10 s/OFF for 90 s)
Power consumption
Instantaneous: 0.73 kW
Short-time rating: 120 W
Instantaneous: 6.6 kW
Short-time rating: 120 W
Instantaneous: 1.46 kW
Short-time rating: 240 W
Protective
function
Built-in resistor over-
heat protection
Built-in relay specifications
· Built-in resistor temperature: Relay is activated at approximately 200°C or higher
and reset at approximately 170°C or lower.
· Built-in thermal fuse (No resetting)
*3
· Contact rating: 250 VAC 200 mA (R load)
12 VAC 500 mA (R load)
42 VDC 200 mA (R load)
· Minimum load: 1 mA
*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.
Operating
environment
Operating ambient
temperature
–10 to 50°C
Storage ambient tem-
perature
–20 to 65°C
Operating ambient
humidity
20% to 90% (with no condensation)
Vibration resistance
5.9 m/s
2
(0.6 G) 10 to 55 Hz
Location At a maximum altitude of 1,000 m (without corrosive gases or dust)
Paint color Munselle 5Y7/1 (except for cooling fan with aluminum base color)
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