Delta Electronics VFD-M manual Main Circuit 2.3.1 Main Circuit Connection

Chapter 2 Installation and Wiring

2.3Main Circuit

2.3.1 Main Circuit Connection

		Brake Resistor
			(Optional)
Non-fuse breaker			BR
(NFB)	MC	B1	B2	Motor
R
		R(L1)	U(T1)
				IM
S		S(L2)	V(T2)
T		T(L3)		3~
			W(T3)
		E
			E

Terminal Symbol

R/L1, S/L2, T/L3

U/T1, V/T2, W/T3

B1 – B2

Explanation of Terminal Function

AC line input terminals (three phase)

Motor connections

Connections for brake resistor (optional)

Earth Ground

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.

2-6 Revision May 2008, ME14, SW V3.04