Ac Supply Requirements; Fuse Types - Emerson E300 Series Design Manual

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4.1

AC supply requirements

Voltage:
200 V drive: 200 V to 240 V ±10 %
400 V drive: 380 V to 480 V ±10 %
575 V drive: 500 V to 575 V ±10 %
690 V drive: 500 V to 690 V ±10 %
Number of phases: 3
Maximum supply imbalance: 2 % negative phase sequence (equivalent to 3 % voltage imbalance between phases).
Frequency range: 45 to 66 Hz
For UL compliance only, the maximum supply symmetrical fault current must be limited to 100 kA
Table 4-1 Supply fault current used to calculate maximum input currents
Model
All
4.1.1 Ground connections
The drive must be connected to the system ground of the AC supply. The ground wiring must conform to local regulations and codes of practice.
4.1.2 Main AC supply contactor
The recommended AC supply contactor type for size 3 to 7 is AC1.
4.1.3 Supply types
All drives are suitable for use on any supply type i.e TN-S, TN-C-S, TT and IT.
• Supplies with voltage up to 600 V may have grounding at any potential, i.e. neutral, centre or corner ("grounded delta")
• Supplies with voltage above 600 V may not have corner grounding
If an SI-Applications Plus option module is installed in the drive, then the drive must not be used on a corner-grounded or centre-
grounded delta supply if the supply voltage is above 300 V. If this is required, please contact the supplier of the drive for more information.
WARNING
Drives are suitable for use on supplies of installation category III and lower according to IEC60664-1 which allows permanent connection to the
supply at its origin in a building. For outdoor installation however, additional over-voltage suppression (transient voltage surge suppression) must be
provided to reduce category IV to category III.
Operation with IT (ungrounded) supplies:
Special attention is required when using internal or external EMC filters with ungrounded supplies, because in the event of a ground
(earth) fault in the motor circuit the drive may not trip and the filter could be over-stressed. In this case, either the EMC filter must not be
used (removed) or additional independent motor ground fault protection must be provided.
WARNING
For details of ground fault protection contact the supplier of the drive.
A ground fault in the supply has no effect in any case. If the motor must continue to run with a ground fault in its own circuit then an input isolating
transformer must be provided and if an EMC filter is required it must be located in the primary circuit. Unusual hazards can occur on ungrounded
supplies with more than one source, for example on ships. Contact the supplier of the drive for more information.
Fuses
The AC supply to the drive must be installed with suitable protection against overload and short-circuits. Nominal fuse ratings are
shown in section 2.4 Ratings on page 12. Failure to observe this requirement will cause risk of fire.
WARNING
4.2

Fuse types

A fuse or other protection must be included in all live connections to the AC supply. An MCB (miniature circuit breaker) or MCCB (moulded-case
circuit-breaker) with type C may be used in place of fuses for size 3 under the following condition:
• The fault-clearing capacity must be sufficient for the installation
The fuse voltage rating must be suitable for the drive supply voltage, refer to section 2.4 Ratings on page 12
Fuses
The AC supply to the drive must be installed with suitable protection against overload and short-circuits. Nominal fuse ratings are
shown in section 2.4 Ratings on page 12. Failure to observe this requirement will cause risk of fire.
WARNING
The input current is affected by the supply voltage and impedance.
E300 Design Guide
Issue Number: 1
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Symmetrical fault level (kA)
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