User manual

28 Specifications
UM6C28C P0728920 Standard 11.00 April 2001 Emerson Energy Systems
Electrical specifications Helios Rectifier 25/48
The electrical specifications of the Helios Rectifier 25/48 are listed in
Table 9.
Table 9 – Electrical specifications of the Helios Rectifier 25/48
Parameter Specifications
Input voltage:
208/240 V ac, one phase, 47-63 Hz
Input voltage range: 176 to 264 V ac
Input current:
7.5 A nominal at 208 V ac input and –56 V dc, 25 A
output
Recommended
AC service input:
45 or 60 A, 2-pole AC circuit breaker for each shelf for
common AC feed
15 or 20 A, 2-pole AC circuit breaker for each rectifier for
individual AC feed
Output voltage: Float: –46 to –56 V dc
Equalize: 0 to 4 V dc above Float
Maximum: –59.5 V dc
Output current: 25 A for each rectifier
75 A for a three position shelf
Input protection: A 2 pole / 20 A circuit breaker opens both lines.
Output
protection:
The rectifier is protected by a single pole 35 A circuit
breaker at the output. The output current limiting circuit is
factory set 30 A and is field adjustable between 12.5 and
30 A.
Efficiency: Efficiency is better than 90% at a nominal input voltage of
240 V ac and an output load greater than 15 A.
Power factor: Power factor is better than 0.98 at loads greater than 10
A and 0.99 at loads greater than 20 A.
Heat dissipation: 156 W (532 Btu/hr)
Helios Rectifier 50/48
Mechanical specifications Helios Rectifier 50/48
The mechanical specifications of the Helios Rectifier 50/48 are listed in
Table 10.