Omron RX Series User Manual page 86

2 Design
Installing Main Circuit Terminal Block Screws
For the 3G3RX-A2055-V1/A2075-V1/A4055-V1/A4075-V1, be sure to install the main circuit terminal
block washers with their recessed portions aligned vertically, as shown below.
Not doing so may result in a contact failure or fire.
(Applicable terminals: R/L1, S/L2, T/L3, +1, P/+2, N/–, U/T1, V/T2, W/T3, RB)
Wiring for Main Power Supply Input Terminals (R/L1, S/L2, T/L3)
The following describes the wiring for the main power supply input terminals and for peripheral equipment.
 Installing molded case circuit breaker
If the inverter's protective function is activated, the inverter internal circuit may be damaged
depending on the condition.
Be sure to connect the main power supply input terminals (R/L1, S/L2, T/L3) to the power supply via
a molded case circuit-breaker (MCCB) according to each inverter.
• When using multiple inverters, install one MCCB per inverter.
• Determine the capacity of the MCCB according to the Molded case circuit breaker (MCCB) value
shown in the previous table.
• Determine the time characteristic of the MCCB upon due consideration of the time characteristic
of the inverter's overheat protection function (150% of the rated output current for 1 min).
• In applications where one MCCB is shared with multiple inverters or other equipment, construct a
sequence that turns OFF the power supply via the alarm output signal, as shown in the figure below.
Power supply
3-phase 200 VAC
3-phase 400 VAC
*1. For 400-V class inverters, connect a 400/200-V transformer.
*2. Set the Multi-function Relay Output (MA, MB) Function Selection (C026) to 05 (AL: Alarm output).
*3. Set the Multi-function Relay Output (MA, MB) Operation Selection (C036) to 00 (NC contact between MB and MC).
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Terminal block screw washer
MCCB MC
OFF
High-function General-purpose Inverter 3G3RX-V1 User's Manual (I578-E1)
Inverter
X
R/L1
S/L2
T/L3
*1
X
MB
ON
MC
X
*2
Alarm output
*3
(NC contact )