Rockwell Automation 2090 Ultra3000 Installation Manual - Manual (Page 34)

Publication 2098-IN003E-EN-P — April 2004
1-10 Installing Your Ultra3000
Fuse Sizing
In the United States, the National Electric Code (NEC) specifies that
fuses must be selected based on the motor full load amperage (FLA).
The typical fuse size should be 300% of the motor FLA for non-time
delay fuses (and time-delay class CC fuses) or 175% of motor FLA for
time delay fuses. If these ratings are not high enough for starting
currents, the NEC allows non-time delay fuses (and time-delay class
CC fuses) to be sized up to 400% of the motor FLA and time-delay
fuses to be sized up to 225% of the motor FLA.
In most cases, fuses selected to match the drive input current rating
will meet the NEC requirements and provide the full drive capabilities.
Dual element, time delay (slow acting) fuses should be used to avoid
nuisance trips during the inrush current of power initialization. Refer
to the section Ultra3000 Power Specifications in Appendix A for input
current and inrush current specifications.
The Ultra3000 utilizes solid state motor short circuit protection rated as
shown in the table below.
Wiring to the auxiliary power terminals (L1 AUX and L2/N AUX) of
the drive should be 2.5 mm
2
(14 AWG) minimum and fusing for the
auxiliary power should be selected to properly protect the wire. For
example, if 60° C (140° F) wire is used, the fuse should not exceed
8A. If 75° C (167° F) wire is used, the fuse should not exceed 13A.
Refer to Fuse Specifications in Appendix A for fuse examples.
HF Bonding Your System Bonding is the practice of connecting metal chassis, assemblies,
frames, shields and enclosures to reduce the effects of electromagnetic
interference (EMI). For more information on the concept of
high-frequency (HF) bonding, the ground plane principle, and
electrical noise reduction, refer to the System Design for Control of
Electrical Noise Reference Manual (publication GMC-RM001x-EN-P).
Drive Models: Input Power Type
Short Circuit Current Rating with No Fuse
Restrictions: Short Circuit Current Rating with Fuse
Restrictions:
2098-DSD-xxx-xx or xxxX-xx
Input Power
and
Auxiliary Input
Power
Suitable for use on a circuit capable of delivering
not more than 5000 rms symmetrical amperes,
240V maximum.
Suitable for use on a circuit capable of delivering
not more than 200,000 rms symmetrical
amperes, 240V maximum, when protected by
high interrupting capacity, current limiting fuses
meeting UL 198C (Class CC, G, J, L, R, T).
2098-DSD-HVxxx-xx or
HVxxxX-xx
Suitable for use on a circuit capable of delivering
not more than 5000 rms symmetrical amperes,
480V maximum.
Suitable for use on a circuit capable of delivering
not more than 200,000 rms symmetrical
amperes, 480V maximum, when protected by
high interrupting capacity, current limiting fuses
meeting UL 198C (Class CC, G, J, L, R, T).