Chapter 3 Wiring | VFD-ED
After removing the front cover, verify if the power and control terminals are clearly noted. Read the
following precautions to avoid wiring mistakes.
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.
Measure the remaining voltage before wiring. For your safety, do not perform any
wiring before the voltage drops to a safe level < 25 V
DC
. Performing a wiring
installation while voltage remains may cause sparks and short circuits.
Only qualified personnel familiar with AC motor drives are allowed to perform
installation, wiring and commission
ing. 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 within the range indicated on the AC motor drive nameplate (see Section 1-1
Nameplate Information).
All the units must be grounded directly to a common ground terminal to prevent
damage from a lightning strike or electric shock.
Make sure you correctly tighten the
main circuit terminal screws to prevent sparks
from screws that have been loosened due to vibration.
When wiring, choose wires that comply with local regulations for your safety.
Check the 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?
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