28 Unidrive M702 Getting Started Guide
Issue Number: 4
4.1 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
Drives are suitable for use on supplies of installation category III and lower, according to IEC 60664-1.
This means they may be connected permanently to the supply at its origin in a building, but for outdoor
installation additional over-voltage suppression (transient voltage surge suppression) must be
provided to reduce category IV to category III.
4.2 Ratings
See section 2.3 Ratings on page 10.
Maximum continuous input current
The values of maximum continuous input current are given to aid the selection of cables and fuses.
These values are stated for the worst case condition with the unusual combination of stiff supply with
high imbalance. The value stated for the maximum continuous input current would only be seen in
one of the input phases. The current in the other two phases would be significantly lower.
The values of maximum input current are stated for a supply with a 2 % negative phase-sequence
imbalance and rated at the maximum supply fault current given in section 2.3 Ratings on page 10.
The nominal cable sizes in section 2.3 Ratings on page 10 are only a guide. Refer to local wiring
regulations for the correct size of cables. In some cases a larger cable is required to avoid excessive
voltage drop.
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 conditions:
• The fault-clearing capacity must be sufficient for the installation
Fuse Types
The fuse voltage rating must be suitable for the drive supply voltage.
If an SI-Applications Plus or SI-Register 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.
If the drive is to be used on an IT (ungrounded) supply, refer to the Drive User Guide for
more information.
The nominal output cable sizes in section 2.3 Ratings on page 10 assume that the motor
maximum current matches that of the drive. Where a motor of reduced rating is used the
cable rating may be chosen to match that of the motor. To ensure that the motor and cable
are protected against over-load, the drive must be programmed with the correct motor
rated current.
Fuses
The AC supply to the drive must be installed with suitable protection against overload and
short-circuits. section 2.3 Ratings on page 10 shows nominal fuse ratings. Failure to
observe this requirement will cause risk of fire.
Unidrive M702 Getting Started Guide English iss3.book Page 28 Friday, August 29, 2014 2:33 PM
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