54
Sigmatek FDD Sizes 7 to 9 Power Installation Guide
4.3 Supplying the size 7, 8 and 9A drives with DC / DC bus
paralleling
The drive may be supplied with DC instead of 3 phase AC.
The connecting of the DC bus between several drives is typically used to:
1.
Return energy from a drive which is being overhauled by the load to a second motoring drive.
2.
Allow the use of one braking resistor to dissipate regenerative energy from several drives.
There are limitations to the combinations of drives which can be used in this configuration.
For further information, contact the supplier of the drive.
4.4 Heatsink fan supply
When operating on normal mains supply the heatsink fan on all drive sizes is supplied internally by
the drive. When operating size 9 in low voltage mode it is necessary to connect an external 24V
supply to terminal 61 and 62 if heatsink fan operation is required. Please see section 4.5
Low voltage
operation
on page 64 for more details.
4.5
Ratings
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 2.4
The nominal cable sizes given in section 2.4
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.
Fuse types
The fuse voltage rating must be suitable for the drive supply voltage.
4.5.1 Main AC supply contactor
The recommended AC supply contactor type is AC1.
FDD
size 9E drives do not have an accessible negative DC terminal. It is recommended
that 9D drives are used as an alternative when this is needed, please refer to the
Modular
Installation Guide
for further details.
The nominal output cable sizes in section 2.4
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. Nominal fuse ratings are shown in section 2.4
on page 10. Failure
to observe this requirement will cause risk of fire.
NOTE
NOTE
WARNING
Summary of Contents for 074.00660
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