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Helios Rectifier 25/48
NT5C06D Installation and User Manual
2. Specifications
Electrical specifications
The NT5C06D rectifier operates within the electrical specifications listed in
Table 1. (Refer to the Product Specification which can be obtained from the
Engineering department of Astec Advanced Power Systems).
Table 1 - Electrical specifications
Input Voltage Rating:
Nominal 208 / 240 V AC single-phase, 47-63 Hz.
Input Voltage Range 176 to 264 V AC.
Starting range 184 to 260 V AC.
When three-phase 208 / 240 V AC source is available to power the
MPS75, it is preferable to distribute the rectifiers among the phases.
Input Current Rating:
7.5 A nominal at 208 V AC input and -56 V DC, 25 A output. Use RW-
90 wire (or equivalent) as listed in Table 2.
Recommended AC Service
Input Fusing:
Two slow flow fuse
PRN type or equivalent, one for each AC line
input; or one slow trip circuit breaker for each rectifier, as listed in
Table 3.
Output Voltage Rating:
Float: -46 V DC to -56 V DC
Equalize: 0 - 4 V DC over float. Maximum -59.5 V DC.
Output Current Rating:
25 A for each rectifier.
Input Protection:
Two-pole 13 A circuit breaker, opens both lines for 208 / 240 V AC
service.
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