2 Design
2 - 56
High-function General-purpose Inverter RX2 Series User’s Manual
200 V Class Models with 30 kW or Higher/400 V Class Models with 45 kW or
Higher
These models have no built-in regenerative braking circuit.
To improve the braking capacity, use the optional external braking resistor(s) and regenerative brak-
ing unit(s). In this case, connect the terminals (P, N) of the regenerative braking unit to the inverter’s
terminals (P, N).
Precautions for Safe Use
• Be sure to install a circuit that detects overheating of the regenerative braking unit(s) and
braking resistor(s) via alarm contacts (thermal relay output terminals) and shuts off the input
power supply of the inverter.
• Do not connect a resistor whose resistance is lower than the connection resistance value
specified in the specifications table for that regenerative braking unit. Doing so may result in
damage to the regenerative braking unit.
• When using the Braking Resistor (Model: 3G3AX-RBA/RBB/RBC) with a 400-V class Regen-
erative Braking Unit (Model: 3G3AX-RBU41/RBU42/RBU43), be sure to connect two braking
resistors of the same model in series. Using the Regenerative Braking Unit with only one
braking resistor connected may cause damage to the braking resistor.
• When using the Regenerative Braking Unit (Model: 3G3AX-RBU21/RBU22/RBU41) with a
built-in braking resistor with the Braking Resistor (Model: 3G3AX-RBA/RBB/RBC), remove
the built-in resistor according to the manual for the regenerative braking unit. Using the
Regenerative Braking Unit with the built-in resistor connected may cause burnout of the
built-in resistor.
• Wiring diagram for connecting one Regenerative Braking Unit (Model: 3G3AX-RBU23)
Braking unit
(option)
Short bar
P
P
N
SL1 SL2 AL1 AL2
RB
MA1 MA2
3G3AX-RBU23
ON
OFF
RY
RY
MC1
*1
R/L1
S/L2
T/L3
U/T1
V/T2
W/T3
P/+
N/-
1(AL1)
2(AL2)
P
RB
3G3AX-RBA
/RBB/RBC
MC1
MC2
MC2
MC1
MCCB
MC2
R
S
T
*2
*1. For RY, select the contact rating according to the ratings of the coils MC1 and MC2.
*2. MC1 and MC2 are used not only to provide redundancy, but also to meet safety standards.
Regenerative braking unit
Inverter
Motor
Fuse
3-phase 200 V
Master
Summary of Contents for RX - 2
Page 1: ...High function General purpose Inverter RX2 Series User s Manual I620 E1 01 3G3RX2...
Page 54: ...1 Overview 1 22 High function General purpose Inverter RX2 Series User s Manual...
Page 136: ...2 Design 2 82 High function General purpose Inverter RX2 Series User s Manual...
Page 592: ...8 Applied Settings 8 192 High function General purpose Inverter RX2 Series User s Manual...
Page 754: ...11 Options 11 56 High function General purpose Inverter RX2 Series User s Manual...
Page 794: ...12 Troubleshooting 12 40 High function General purpose Inverter RX2 Series User s Manual...
Page 919: ......