Chapter 2 Installation and Wiring
VFD-EL-W
2-7
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
No Fuse Breaker
(NFB)
Motor
Terminal Symbol Explanation of Terminal Function
R/L1, S/L2, T/L3
Mains input terminals (one-phase/three-phase)
U/T1, V/T2, W/T3
Motor drive output terminals for connecting three-phase induction motor
Ground connection. Please comply with local regulations.
Mains power terminals (R/L1, S/L2, T/L3)
Do NOT connect three-phase motor drives to single-phase AC power. There is no sequential order when
connecting mains power terminals R/L1, S/L2, T/L3. Connect these terminals with a freely usable standard.
Connect terminals (R/L1, S/L2, and T/L3) with a non-fuse breaker to three-phase AC power for circuit
protection. It is recommended that you add a magnetic contactor (MC) in the power input wiring to cut off
power quickly and reduce malfunction when activating the protection function for the AC motor drives. Both
ends of the MC should have an R-C surge absorber.
Make sure that you correctly tighten the main circuit terminal screws to prevent sparks caused by loosening
screws due to vibration.
Use voltage and current levels according to the specifications in Appendix A.
When using a GFCI (Ground Fault Circuit Interrupter), select a current sensor with sensitivity of 200 mA or
higher, and not less than 0.1 second operation time to avoid nuisance tripping. For specific GFCI of the AC
motor drive, select a current sensor with sensitivity of 30 mA or higher.
Do NOT run or stop AC motor drives by turning the power ON or OFF. Use the RUN or STOP command
through the control terminals or a keypad. If you still need to run or stop the AC drives by turning the power
ON or OFF, it is recommended to do so no more often than ONCE per hour.
Output terminals for main circuit (U, V, W)
The default for the operation direction is running forward. The method to control the running direction is to set
by the communication parameters. Refer to the Parameter Group 09 in Chapter 4 for details.
When it is necessary to install the filter at the output side of terminals U/T1, V/T2, W/T3 on the AC motor
drive, use an inductance filter. Do not use phase-compensation capacitors or L-C (Inductance-Capacitance)
or R-C (Resistance-Capacitance), unless approved by Delta.
DO NOT connect phase-compensation capacitors or surge absorbers at the output terminals of AC motor
drives.
Use a well-insulated motor, suitable for inverter operation.
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