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Total Access 3000/3010 4-Pair Line Power Unit Installation and Maintenance Practice
8 61181500L2-5B
Powering
The LPU operates on a –40 VDC to –56.7 VDC input voltage range.
The LPU uses about 10 watts of total power on the board, as follows:
• 2 watts are in the following input circuitries:
– input diodes (A and B diodes)
– inrush limiting Field Effect Transistor (FET)
–input inductor
–input fuse
• 1 watt is dissipated in the locally powered micro-controller and power supply components
• 7 watts are in the span supply
The output voltages are ±145 VDC and are provided on the four loop pairs as shown in
Table 3.
The LPU current and voltage limits are shown in Table 4.
NOTE
Both A and B inputs should be wired to limit the amount of current
flowing into the powering pins on the Total Access 3000/3010
backplane connector.
Table 3. Span Powered Pair Assignments
Total Access 3000/3010 Backplane Pair Number Module Edge Connector Pin Number
(Tip, Ring)
Pair 1 C6, B6
Pair 2 C5, C4
Pair 3 B5, A5
Pair 4 B4, A4
Table 4. Current and Voltage Limits
Voltage Supply Minimum Current Maximum Current
290 VDC ±5% 0.004 amps 0.4 amps
–40 VDC to –56.7 VDC N/A 2.6 amps