Delta Electronics VFD-EL manual Main Circuit 2.3.1 Main Circuit Connection, Terminal Symbol

Chapter 2 Installation and Wiring

2.3Main Circuit

2.3.1 Main Circuit Connection

Brake Resistor(Optional)

			BR	Brake Unit
			BUE
No fuse breaker				(Optional)
(NFB)	MC	+		-
R		R (L1)		U (T 1)
S		S(L2 )		V(T2 )
T		T(L 3)
				W(T3 )
		E
				E

Motor

IM 3 ~

Terminal Symbol

R/L1, S/L2, T/L3

U/T1, V/T2, W/T3

+, -

Explanation of Terminal Function

AC line input terminals (1-phase/3-phase)

AC drive output terminals for connecting 3-phase induction motor

Connections for External Brake unit (BUE series)

Earth connection, please comply with local regulations.

CAUTION!

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.

„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.

Revision August 2008, 2ELE, V1.02 2-9