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Chapter 2 Installation and Wiring|
2-8 Revision Nov. 2008, VLE1, SW V1.03
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.
Please use voltage and current within the regulation shown in Appendix A.
When using a general GFCI (Ground Fault Circuit Interrupter), select a current sensor
with sensitivity of 200mA or above, and not less than 0.1-second operation time to avoid
nuisance tripping. For the specific GFCI of the AC motor drive, please select a current
sensor with sensitivity of 30mA or above.
Do NOT run/stop AC motor drives by turning the power ON/OFF. Run/stop AC motor
drives by RUN/STOP command via control terminals or keypad. If you still need to
run/stop AC drives by turning power ON/OFF, it is recommended to do so only ONCE per
hour.
Do NOT connect 3-phase models to a 1-phase power source.
Output terminals for main circuit (U, V, W)
When it needs to install the filter at the output side of terminals U/T1, V/T2, W/T3 on the
AC motor drive. Please use 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 well-insulated motor, suitable for inverter operation.
Terminals [+1, +2] for connecting DC reactor, terminals [+1, +2/B1] for connecting brake
resistor
+1
Jumper
DC reactor
To improve power factor and reduce harmonics connect a DC reactor between terminals
[+1, +2/B1]. Please remove the jumper before connecting the DC reactor.