Emerson ASTEC Helios Candeo AP6C75AA, Installation Manual

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50 Cabling and connecting
IM6C75AA P0914426 Standard 3.00 March 2001
4.3.2. Cabling and connecting the rectifier AC interface modules
The AP6C75AA Helios Candeo power system uses single-phase AC input, 50 A
DC output, plug-in type rectifiers. Each rectifier position requires its own AC
feed. The rectifier can be connected phase-to phase to a 120/240 V single phase
AC source or a 120/208 V 3-phase AC source, in which case the recommended
AC supply circuit breaker is a 30 A 2-pole unit, or phase-to-neutral to a 230/415
V 3-phase AC source, in which case the recommended AC supply circuit
breaker is a 30 A single-pole unit. When a 3-phase AC source is being used, it is
preferable to distribute the rectifiers evenly among the three phases.
Note:
The operating range is 80 V ac to 295 V ac at 45-65 Hz. Do not operate
from a higher voltage source.
There are two methods of bringing the AC feeds to the rectifier positions:
•
Bulk wiring (individual wires) for up to 20 rectifiers within rigid or flex
conduits attached to the optional AC box at the top of the frame as shown
in Figure 4.5, and down the AC channel to each individual rectifier position
as shown Figure 4.8. Note that until an optional bottom AC box is available,
this method is not available for bottom fed applications
•
Individual armored cables, some of which are brought down or up within
the frame upright to each individual rectifier position as shown in Figure 4.6,
the others being brought down or up on the outside of the frame as shown
in Figure 4.7 (left side as viewed from the font) to each individual rectifier
position as shown in Figure 4.8. The maximum number of cables inside and
outside the frame is dependent upon the type of cable used as per Table 4.8.
Note:
For applications using two frames or more, bulk wiring is required
since there is no space for individual cables in-between the frame.
The following Table lists the type and size of cables used according to local
preferences and the resulting number of cables inside and outside the frame.
Table 4.8 – Preferred cable sizes and quantities for the AC input supply of the rectifiers
Cable type Preferred
type in:
Number of cables
inside the frame
Number of cables on the
outside of the frame
Maximum number
of rectifiers
TECK-90 7TF-1002AJ Canada 0-10 11-25 25
MC 7XF-1003AJ USA 0-10 11-25 25
MC 7A-1002A USA 0-16 17-25 25
TBD Europe TBD TBD TBD
The AC connections for the rectifiers are done on rectifier AC interface
modules installed on the AC rail, on the left side of the frame as viewed from
the front.