Digitax HD M75X Quick Start Guide
19
Issue Number: 2
5.2
Electrical
5.2.1
Ratings
The electrical ratings are shown in section 1.1
Ratings
on page 8.
5.2.2
Short circuit current rating
All drives:
5 kA when protected by Listed fuses as specified in the
Digitax HD M75X Series Installation and
Technical Guide
.
100 kA when protected by recognised supplemental fuses as specified in the
Digitax HD M75X
Series Installation and Technical Guide
.
5.2.3
Overvoltage category
The Over Voltage Category is OVC III.
OVC III applies to equipment permanently connected in fixed installations (Downstream of and
including the main distribution board).
5.2.4
Input current, fuse ratings and cable sizes
Electrical installation shall be in accordance with the US National Electrical Code, the Canadian
Electrical Code and any additional local codes, as required.
The ground (earth) connections and the DC power connections must use UL Listed ring terminals
sized according to the field wiring. Only one cable is permitted to be connected to each field wiring
terminal.
The recommended cable sizes and fuse ratings are shown in section 1.1
Ratings
on page 8.
Drives must be installed using cables rated for 75 °C operation, copper wire only.
Opening of the branch-circuit protective device may be an indication that a fault has been
interrupted. To reduce the risk of fire or electric shock, the equipment should be examined and
replaced if damaged. If burnout of the current element of an overload relay occurs, the complete
overload relay must be replaced.
Integral solid state short circuit protection does not provide branch circuit protection. Branch circuit
protection must be provided in accordance with the National Electrical Code (NEC), The Canadian
Electrical Code, and any additional local codes.
5.2.5
Motor cable size and maximum length
The recommended motor cable sizes and maximum length are shown in section 1.1
Ratings
on
page 8.
5.2.6
Multiple wiring arrangements
The drives are able to operate from either a single phase or a three-phase AC supply.
Additionally, the drives are able to operate from a DC supply with a range from 24 Vdc up to the
maximum rated DC supply voltage. It is possible for the drive to go from operating on a normal line
power supply voltage to operating on a much lower supply voltage without interruption. The wiring
arrangements are shown in the ‘Electrical installation’ (Chapter 4) of the
Digitax HD M75X Series
Installation and Technical Guide
.
5.2.7
External 24 V supply
An external 24 Vdc supply is required to power the low voltage circuits within the drive. The low
voltage circuits are isolated from the live circuits. The 24 V supply must be protected by a
supplemental fuse. Refer to the ‘Electrical installation’ (Chapter 4) of the
Digitax HD M75X Series
Installation and Technical Guide
.
5.2.8
Common DC bus systems
Multiple drives can be connected together via a common DC bus. For further details, refer to
‘Multi axis system design’ (Chapter 5) of the
Digitax HD M75X Series Installation and Technical
Guide
.
