Installation Safety Precautions - Toshiba VFS5 Series Operation Manual

1) Always ground the unit to prevent electrical shock and to help reduce
electrical noise. A separate ground cable should be run inside the conduit
with the input, output, and control power cables (See Grounding page 17).
THE METAL OF CONDUIT IS NOT AN ACCEPTABLE GROUND.
2) Only qualified personnel should install this equipment (see General Safety Instructions on
page 5).
3) Installation of drive systems should conform as a minimum, to the 1996 NEC National Electrical
Code Article 110 "Requirements For Electrical Installations", to all regulations of the Occupational
Safety and Health Administration, and to any other applicable national, regional or industry codes
and standards.
4) Install in a secure and upright position in a well ventilated location that is out of direct sunlight.
The ambient temperature should be between -10° C and 40° C.
5) Allow a clearance space of 4 inches (20 cm) for the top and bottom and 2 inches (5 cm) on both
sides. This space will insure adequate ventilation. Do not obstruct any of the ventilation openings.
6) Avoid installation in areas where vibration, heat, humidity, dust, fibers, steel particles, explosive
mists, gasses or sources of electrical noise are present.
7) Adequate working space and illumination must be provided for adjustment, inspection and
maintenance of the drive (see 1996 NEC Article 110-16).
8) A noncombustible insulating floor or mat should be provided in the area immediately surrounding
the electrical system where maintenance is required.
9) Use lockout/tagout procedures on branch circuit disconnect before drive installation.
10) Connect three phase power of the correct voltage to input terminals L1, L2, L3 (R, S, T) and connect
3- phase power from output terminals T1, T2, T3 (U, V, W) to a motor of the correct voltage and type
for the application. Size the branch circuit conductors in accordance with Selection of Main Circuit
Wiring Equipment and Standard Cable Sizes Page 16.
11) If conductors of a smaller than recommended size are used in parallel to share current then the
conductors should be kept together in sets i.e. U1, V1, W1 in one conduit and U2, V2, W2 in another
(see 1996 NEC Article 300-20 and Article 310-4). National and local electrical codes should be
checked for possible cable derating factors if more than three power conductors are run in the same
conduit (see 1996 NEC Article 310 adjustment factors on page 70-196).
12) Install a molded case circuit breaker (MCCB) between the power source and the drive. Size the
MCCB to clear the available fault current of the power source (see 1996 NEC Article 430 Article 102
through Article 111).
TOSHIBA

Installation Safety Precautions

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