Nortel Meridian 1 Manual page 85

Installing DC power Page 47 of 500
The ordering codes for the complete power plant are NT5C90EF and
NT5C90EG. Each of these configurations is a complete power bay with an
NT6C14GB Control and Distribution Panel mounted on an NT6C40DC
Seismic Rack:
— NT5C90EF is a single MPS75 shelf, with a capacity of 75 amps.
— NT5C90EG is a dual-shelf configuration, with a capacity of 150 amps.
The MFA150 power system requires one 50-amp power feed per shelf.
System 600/48 Power Plant
The System 600/48 Power Plant is a positive ground, –48 V dc, 600-A power
plant. It can be used with all Meridian 1 DC-powered systems, but is
optimized for larger system configurations such as system options 71, 81, and
81C. Other switchroom equipment that requires –48 V dc power may also be
powered from the System 600 Power Plant, as long as there are sufficient
output circuit breakers or auxiliary fuses, the total load does not exceed
600 A, and a consistent, single-point ground topology is maintained for all
associated equipment.
The System 600 Power Plant consists of either the NT6C32AD main bay (for
loads requiring up to 300 A) or the NT6C32AD main bay and the NT6C32AE
supplemental bay (for loads up to 600 A), a front access common equipment
panel, one front access controller, one front access circuit breaker panel, and
two rectifier shelves that can contain up to six NT5CO7AC rectifiers.
Included with the supplemental bay are all DC cables and signal wires to
connect the supplemental bay to the main bay.
The System 600/48 Power Plant utilizes up to twelve 50-A switch mode
rectifiers (NT5CO7AC) as building blocks connected in parallel to reach the
maximum capacity of 600 A. This maximum capacity may be attained
without power interruption to the load.
The rectifiers operate on single-phase 50 or 60 hertz AC service from either
208 V or 240 V nominal input. The power system may operate with or
without –48 V dc batteries for reserve power. If batteries are connected, the
rectifiers can operate in either the float or equalize mode.
System installation procedures