Rockwell Automation 1302 575v AC Drive - Canada Only - Manual (Page 32)

4–4 Installation
Publication 1302-5.0 — January, 1998
Install the input power and output power components that are located
outside of the 1302 enclosure. See Figure 5.1. The following
sections describe disconnect, transformer, and AC line branch
protection installation
.
Disconnects
An input disconnect (for example, a switch or circuit breaker) must
be installed in the line before the Drive input terminals in accordance
with local, national, and international codes (e.g., NEC/CEC). Size
the disconnect according to the inrush current as well as any
additional loads the disconnect might supply. Coordinate the trip
rating for the current (10 to 12 times the full load current) with that
of the input isolation transformer, if used. Refer to the Transformers
section of this chapter for additional information.
Input AC Line Branch Protection
!
ATTENTION: Most codes require that upstream
branch protection be provided to protect input power
wiring. To guard against personal injury and/or
equipment damage caused by improper fusing, use
only properly rated line fuses. Branch circuit breakers
or disconnect switches cannot provide this level of
protection for Drive components.
User-supplied branch circuit protection fuses must be installed
according to the applicable local, national, and international codes
(for example, NEC/CEC). The fuses must be installed in the line
before the Drive’s AC input terminals. Table 3.F provides fuse
values.
Transformers
!
ATTENTION: If the AC input power system does not
have a neutral or one phase referenced to ground, an
isolation transformer with the neutral of the secondary
grounded is highly recommended. If the line–to–line
voltages on any phase can exceed 125% of the nominal
line–to–line voltage, an isolation transformer with the
neutral of the secondary grounded, is always required.
Failure to observe these precautions could result in
bodily injury or damage to equipment.
ATTENTION: When the AC line is shared directly
with other SCR–rectified drives, an optional snubber
resistor braking kit might be required to alleviate
excess DC bus voltage. Failure to observe these
precautions could result in damage to, or destruction
of, the equipment.
External Component
Installation