Delta Electronics VFD-S Main Terminals Connections, Control circuit terminals U/T1, V/T2, W/T3

	Chapter 2 Installation and WiringVFD-S Series
2.4.3 Main Terminals Connections
Terminal Symbol	Explanation of Terminal Function
R/L1, S/L2, T/L3	AC line input terminals (3-phase)
L/L1, N/L2	AC line input terminals (1-phase)
U/T1, V/T2, W/T3	AC drive output terminals for connecting 3-phase induction
	motor
+1, +2/B1	Connections for DC choke. Please remove the jumper prior to
	installation.
+2/B1, B2	Connections for brake resistor (optional)
	Earth connection, please comply with local regulations.

Mains power terminals (R/L1, S/L2, T/L3 and L/L1, N/L2)

„Connect these terminals 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, or else phase loss may occur.

Control circuit terminals (U/T1, V/T2, W/T3)

„When the AC drive output terminals U/T1, V/T2, and W/T3 are connected to the motor terminals U, V, and W, 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

Revision August 2008, SE09, SW V2.61 2-23