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Chapter 2 Installation and Wiring| BLD-E1 Series
Revision May 2009, 00DE, V0.50 2-7
2.3 Main Circuit
2.3.1 Main Circuit Connection
Terminal Symbol Explanation of Terminal Function
R/L1, S/L2, T/L3
Input terminals of commercial power (1-phase/3-phase)
U/T1, V/T2, W/T3
Output terminals of brushless DC motor drive for connecting
brushless DC motor. Wire: U/T1 (Red); V/T2 (White); W/T3 (Black)
+, -
Connections for External Brake unit (BUE series)
E
Earth connection, please comply with local regulations.
CAUTION!
Mains power terminals (R/L1, S/L2, T/L3)
DO NOT apply 1-phase power to 3-phase models. It is unnecessary to consider phase-
sequence of these mains power terminals (R/L1, S/L2, T/L3).
To connect a no fuse switch between 3-phase AC input power and main circuit terminals
(R/L1, S/L2, T/L3) is necessary. It is recommended to add a magnetic contactor (MC) in the
power input wiring to cut off power quickly and reduce malfunction when activating the
protection function of brushless DC motor drives. Both ends of the MC should have an R-C
surge absorber.
Please make sure to fasten the screw of the main circuit terminals to prevent sparks which is
made by the loose screws due to vibration.
Please use voltage and current within the regulation shown in Appendix A.