Main Circuit; Main Circuit Connection - Delta Electronics VFD-M Series User Manual

Chapter 2 Installation and Wiring|

2.3 Main Circuit

2.3.1 Main Circuit Connection

Non-fuse breaker
(NFB)
R
S
T
Terminal Symbol
R/L1, S/L2, T/L3
U/T1, V/T2, W/T3
B1 – B2
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
MC
B1
R(L1)
S(L2)
T(L3)
E
Explanation of Terminal Function
AC line input terminals (three phase)
Motor connections
Connections for brake resistor (optional)
Earth Ground
Brake Resistor
(Optional)
BR
B2
U(T1)
V(T2)
W(T3)
E
Revision May 2008, ME14, SW V3.04
Motor
IM
3~