Chapter 2 Installation And Wiring - Delta VFD-EL-W Series User Manual

Sensorless vector control compact drive
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After removing the covers of input/output side terminals and control board terminals, verify the main circuit
terminals and control circuit terminals are clear. Be sure to observe the following precautions when wiring.
Turn off the AC motor drive power before installing any wiring. A hazardous charge may
still remain in the DC bus capacitors after the power has been turned off. For your safety,
wait until the digital keypad indictor turns off and measure the DC voltage with the
voltmeter. Makes sure the voltage drops to a safe level < 25 V
a wiring installation while voltage remains may cause sparks and short circuits.
DANGER
Only qualified personnel familiar with AC motor drives are allowed to do the wiring. Make
sure the power is turned off before wiring to prevent electric shock.
Make sure that power is only applied to the R/L1, S/L2, and T/L3 terminals. Failure to
comply may result in damage to the equipment. The voltage and current should be in the
range on the AC motor drive nameplate.(refer to Section 1-1 Receiving and Inspection for
details)
The grounding terminals must be well-grounded to prevent electric shock or fire accidents
and to reduce noise interference.
Make sure that you correctly tighten the main circuit terminal screws to prevent sparks that
can be caused by screws loosened due to vibration.
When wiring, choose wires that comply with local regulations for your safety.
Check following items after finishing the wiring:
1. Are all connections correct?
2. Are there any loose wires?
3. Are there any short circuits between the terminals or to ground?

Chapter 2 Installation and Wiring

2.1 Wiring
2.2 External Wiring
2.3 Main Circuit
2.4 Control Terminals
2.5 NPN / PNP Mode
before wiring. Performing
DC
2-1

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