Start Up 4 - 3
7. Avoid running input and output wiring in the same conduit.
8. Avoid routing power wiring near equipment sensitive to electrical noise.
9. Never allow wire leads to touch metal surfaces. Short-circuit may result.
10. Never connect AC main power to output terminals U/T1, V/T2 and W/T3.
11. Never connect power factor correction capacitors or noise filters to the Drive output.
12. Use 600Vac vinyl-sheathed wire or equivalent. Wire size should be determined considering voltage drop of leads.
Line voltage drop (V) =
x wire resistance (W/km) x wire length (m) x current (A) x 10
-3
13. It is recommended that the motor lead length not exceed 164 feet (50 meters) and motor wiring be run in a separate
conduit from the power wiring. If lead length must exceed this distance, reduce the carrier frequency (See Table 2.6)
and consult Yaskawa toll free at 1-800-YASKAWA (927-5292) for proper installation procedures.
14. Signal and control leads must be separated from main circuit leads (R/L1, S/L2, T/L3, U/T1, V/T2, W/T3).
15. Determine proper wire size for power and motor leads. Refer to Tables 2.1 and 2.2 for details.
16. Review proper ground connections for the Drive. Refer to Chapter 2 – Electrical Installation for details. The Drive
must be solidly grounded using the main circuit ground terminal. Ground resistance should be less than 100Ω for a
208-240Vac Drive. Ground resistance should be less than 10Ω for a 480Vac Drive. Select wire size suitable for size
of terminal screw. Make the length as short as possible.
Never ground the drive in common with welding machines, motors or other large-current electrical equipment.
Where several Drives are used, ground each Drive directly or daisy-chain to the ground pole(s).
DO NOT FORM A LOOP WITH THE GROUND LEADS. See Figure 2.4.
17. Review terminal functions of signal and control circuits. Refer to Table 2.8.
18. Verify if any customer safeties are required (e.g. firestat, freezestat, high static pressure).
19. Record the following motor nameplate information:
Voltage: _____________________Amps: ____________________
20. Verify that the commercial power supply is within the rated Drive input voltage:
Power Supply: ____________________Vac Drive Input Voltage: ____________________Vac
21. Verify that the leads in the electric motor conduit box are configured for the proper voltage.
22. Ensure Motor Rated Current is less than or equal to Drive Output Amps. If multiple motors are being used, make
sure that the Motor Rated Current sum is less than or equal to Drive Output Amp rating. Please note that if multiple
motors are being operated off one Drive, each motor must have its own overload protection.
3
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