Delta Electronics VFD-M Series, User Manual

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Chapter 2 Installation and Wiring
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2-6 Revision May 2008, ME14, SW V3.04
2.3 Main Circuit
2.3.1 Main Circuit Connection
R(L1)
S(L2)
T(L3)
R
S
T
U(T1)
V(T2)
W(T3)
IM
3~
MC
E
E
B1
Non-fuse breaker
(NFB)
Brake Resistor
(Optional)
Motor
BR
B2
Terminal Symbol Explanation of Terminal Function
R/L1, S/L2, T/L3 AC line input terminals (three phase)
U/T1, V/T2, W/T3 Motor connections
B1 – B2 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.