Main Terminals Connections - Delta VFD-BW Series User Manual

2.4.3 Main Terminals Connections

Terminal Symbol
R, S, T
U, V, W
P1, P2
P-B, P2/B1-B2
P2-N, P2/B1-N [+2-(-),+2/B1-(-)]
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 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.
Revision May 2009, BWE0, SW V1.05
R/L1, S/L2, T/L3 AC line input terminals (3-phase)
AC drive output terminals for connecting 3-phase
U/T1, V/T2, W/T3
induction motor
Connections for DC reactor (optional).
+1, +2
Please remove the jumper before connecting DC reactor.
Models of 15kW and above have a built-in DC reactor.
+2/B1, B2 Connections for brake resistor (optional)
Connections for external brake unit (VFDB series)
Earth connection, please comply with local regulations.
Chapter 2 Installation and Wiring|VFD-BW Series
Explanation of Terminal Function
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