5-1 Standard Specification List 5Specifications 5-1 Standard Specification List Models with a Built-in Resistor (3G3AX-RBU21/-RBU22/-RBU41) 5 Specifications *1. To use the Braking Resistor (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. If the 400-V class Regenerative Braking Unit is operated with a single Braking Resistor, the Braking Resistor may be damaged. *2. Set the DIP switches. 5-1 Voltage class 3-phase 200 V class 3-phase 400 V class Model (3G3AX-) RBU21 RBU22 RBU41*1 Connectable resistance 17 Ω min. 17 Ω min. 34 Ω 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 available) Operation indication LED ON (Lit) Maximum number of units in parallel operation*2 5 units Built-in resistor Built-in resistance 120 W 180 Ω 120 W 20 Ω 120 W 180 Ω x 2 in series Allowable consecu- tive ON time 10s max. 0.5s max. 10s max. Allowable opera- tion cycle Cycle 1/10 (10s ON/90s OFF) Cycle 1/80 (0.5s ON/40s OFF) Cycle 1/10 (10s ON/90s OFF) 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 functions Built-in resistance overheat protection Built-in relay specifications • The temperature relay operates if the built-in resistor reaches approx. 200 °C or more, and recovers at approx. 170 °C or less.
• Built-in thermal fuse (recovery impossible)*3 • Rating of contact 250 V AC 200 mA (R load) 12 V DC 500 mA(R load) 42 V DC 200 mA(R load) • Minimum load 1 mA 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 5.9 m/s2 (0.6G) 10 to 55 Hz Location At a maximum altitude of 1000m; indoors (without corrosive gases or dust) Paint color Munsell 5Y7/1 (cooling fan: aluminum ground color)