4.2 Checking Prior to Powering On
4-2
4.2 Checking Prior to Powering On
Check the following before powering on the inverter.
(1) Check that the wiring is correct.
Especially check the wiring to the inverter input terminals (L1/R, L2/S, L3/T) and output terminals (U, V, and
W). Also check that the grounding wires are connected to the grounding terminals (*G) correctly. (See Fig.
4.2-1.)
• Never connect power supply wires to the inverter output terminals U, V, and W. Doing so and turning the
power ON breaks the inverter.
• Be sure to connect the grounding wires of the inverter and the motor to the ground electrodes.
Failure to observe this could result in electric shock.
(2) Check the control circuit terminals and main circuit terminals for short circuits or ground faults.
(3) Check for loose terminals, connectors and screws.
(4) Check that the motor is separated from mechanical equipment.
(5) Make sure that all switches of devices connected to the inverter are turned OFF.
Powering on the inverter with any of those switches being ON may cause an unexpected motor operation.
(6) Check that safety measures are taken against runaway of the equipment, e.g., a defense to prevent people
from access to the equipment.
(7) If using a DC reactor (DCR) (option), is it properly connected to DC reactor terminals P1 and P(+)?
Fig. 4.2-1 Connection of main circuit terminals (three-phase power supply)
G L1/R L2/S L3/T U V WP1 P(+) DB G
3
M
G L1/R L2/S L3/T U V WP1 P(+) DB G
3
M
Jumper bar
When no DCR used
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