Intel
®
Carrier Grade Server TIGPT1U TPS
DC Power Subsystem
Revision 1.0
63
8.4.4
Power Supply Module LED Indicators
There is a single bi-color LED to indicate power supply status. When DC line is applied to the
Power Supply Unit (PSU) and standby voltages are available the LED blinks green. The LED
turns on solid green to indicate that all the power outputs are available. In case of over-current
protection (OCP), over-voltage protection (OVP), over-temperature protection (OTP), fan failure,
or under voltage, the LED turns on solid amber. Refer to the table below.
Table 8-3. LED Indicators
POWER SUPPLY CONDITION
Power Supply LED
No DC line power to all PSU
Off
DC line present / Only Standby Outputs On
Blink Green
Power supply DC outputs ON and OK
Green
Power supply shutdown due to over current, over temperature, fan failure,
over voltage, or under voltage.
Amber
Power supply failed and DC line fuse open or other critical failure.
Amber or Off
8.5 Electrical
Requirements
8.5.1
DC Input Voltage Specification
The power supply is capable of supplying full rated output power over entire nominal –48/-60
VDC that covers the range from –38 VDC to –75 VDC. The power supply will automatically
recover from DC power loss. The input voltage and current requirements for continuous
operation are stated below. The power supply is able to start up under peak loading at any
input voltage listed below.
Table 8-4. DC Input Rating
Parameter Min Nom Max Unit
V
in
(-48 VDC)
- 38.0
- 48.0/-60.0
- 75.0
VDC
I
in
(-38 VDC)
-
9.4
ADC
I
in
(-75 VDC)
-
4.75
ADC
8.5.2
Dual DC Input
The power supply requires a dual power feed (A and B battery feed). The A and B feeds are
interconnected via blocking diodes with 250 VDC minimum blocking voltage rating. The power
supply provides four series diodes, one for each wire feed. The power supply also provides two
internal slow-blow fuses, one on each –48 V input wire.
