Technical Manual Issue 2.1 4000 Digital Series II
Page 98 STA0381
4.8.7 Mains Panel (4U and 9U Racks)
The Mains Panel on the 9U rack is a fixed panel on the right-hand side at the rear of the unit, and on
the left-hand side for the 4U rack.
4.8.8 AC Supplies
Provision is made for two AC supplies; they are wired to independent PSU slots, so that with the
appropriate provision of power supplies, full AC redundancy is available. The power supply redundancy
arrangements are discussed in the following section.
4.9 4000 Power Arrangements
4.9.1 4420 (4U) Matrix
The supply requirements of the 4U Matrix are met with 4172 Power Supply Unit (PSU). The supplies
can operate over mains AC inputs between 90V and 250V @ 50/60Hz.
Provision is made for two type PD4172 power supplies for AC and DC redundancy. Each PD4171 is a
4 rail power supply rated at 5V @ 20A, +/-12V @ 2A and -5V @ 2A.
2 PSUs fitted for redundancy option.
4.9.2 4920 (9U) Matrix
The supply requirements of the 4920 9U Matrix are met with a 4173 PSU between 90V and 250V @ 50/
60Hz. The maximum power requirement of the Matrix is 300W.
Two switched and fused AC inlets (AC1 and AC2) are provided at the back of the frame via IEC
connectors.
The following Table and diagram allow system power supply redundancy to be understood. In the
diagram, a 'small system' is considered to be one that draws less than 20A from the PSU; a `large
system' is considered to be one that draws 20A or more from the PSU. The total amperage can be
calculated by referring to the Table and calculating the total system load.
The following Table gives details of the matrix card power requirements.
Details of the connector pin outs are given in the 4000 Digital Series
Installation Guide.
Information concerning the individual power supplies and fusing is
given in the 4000 Digital Series Installation Guide.
Information concerning the individual power supplies and fusing is
given in the 4000 Digital Series Installation Guide.
Table 14: Matrix Card Power Requirements
PDE4642 Microprocessor Card +5V @ 1.2A
PDE3601A Digital Matrix Card +5V @ 3.0A; -5V @ 0.1A
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