Omron Sysdrive RX Series - Page 367

7-18
7-3 Options
7
Specifications
External resistor type (3G3AX-RBU23/-RBU24/-RBU42/-RBU43)
*1 When using a braking resistor (model 3G3AX-RAB/-RBB/-RBC) for a 400-V-class regenerative braking unit,
connect two of the same size braking resistors in series.
Damage may occur to a 400-V-class regenerative braking unit if operated with only one braking resistor con-
nected.
*2 Set up using DIP switch.
Applicable voltage class 3-phase 200-V class 3-phase 400-V class
Model 3G3AX-RBU23 3G3AX-RBU24 3G3AX-RBU42 3G3AX-RBU43
Discharge resistance
Continuous
operation
6 Ω min. 4 Ω min. 24 Ω min. 12 Ω min.
Short-time/
operation
Allowable
operation cycle/
Continuous ON
time
4 Ω min.
1/5
2 min
2 Ω min.
1/5
2 min
10 Ω min.
1/10
10 s
6 Ω min.
1/5
2 min
Operating voltage ON/
OFF
ON: 362.5 ± 5 V
OFF: 355 ± 5 V
ON: 725 ± 5 V
OFF: 710 ± 5 V
Operation indication LED ON (Lit)
Maximum number of
units operating in
parallel
2 units max.
Protective functions
Internal power
module overheat
protection
Built-in relay specifications
Cooling fin temperature Relay operates at approximately 100°C or higher.
• Rating of contact: 240 V AC 3 A (R load)
36 V DC 2 A (R load)
• Minimum load: 5 V DC 50 mA (R load)
Operating environment
Ambient
temperature
-10°C to 50°C
Ambient storage
temperature
-20°C to 65°C (short-time temperature during transport)
Humidity 20% to 90% (with no condensation)
Vibration 4.9 m/s
2
(0.5G) 10 to 55 Hz
Location At a maximum altitude of 1,000 m; indoors (without corrosive gases or dust)
Paint color Munselle 5Y7/1 (cooling fan: aluminum ground color)