Chapter 2 Installation and Wiring_VFD-B Series
Revision 10/2005, BE13, SW V4.08 2-19
2.4.3 Main Terminals Connections
Terminal Symbol Explanation of Terminal Function
R, S, T R/L1, S/L2, T/L3 AC line input terminals (1-phase/3-phase)
U, V, W U/T1, V/T2, W/T3
AC drive output terminals for connecting 3-phase
induction motor
P1, P2 +1, +2 Connections for DC Choke (optional)
P-B, P2/B1~B2 +2/B1~B2 Connections for Braking Resistor (optional)
P2~N, P2/B1~N +2~(-), +2/B1~(-) Connections for External Braking Unit (VFDB series)
Earth connection, please comply with local regulations.
Mains power terminals (R/L1, S/L2, T/L3)
Connect these terminals (R/L1, S/L2, T/L3) via a non-fuse breaker or earth leakage breaker to 3-
phase AC power (some models to 1-phase AC power) for circuit protection. It is unnecessary to
consider phase-sequence.
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 AC motor drives. Both
ends of the MC should have an R-C surge absorber.
Do NOT run/stop AC motor drives by turning the power ON/OFF. Run/stop AC motor drives by
RUN/STOP command via control terminals or keypad. If you still need to run/stop AC drives by
turning power ON/OFF, it is recommended to do so only ONCE per hour.
Do NOT connect 3-phase models to a 1-phase power source.
Control circuit terminals (U, V, W)
When the AC drive output terminals U/T1, V/T2, and W/T3 are connected to the motor terminals
U/T1, V/T2, and W/T3, respectively, the motor will rotate counterclockwise (as viewed on the shaft
end of the motor) when a forward operation command is received. To permanently reverse the
direction of motor rotation, switch over any of the two motor leads.
Forward
running
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