Over Temperature Protection (Otp); Power Supply Status Led; Table 16. Led Indicators - Intel SR1500 - AXXMINIDIMM DDR-2 RAID Controller Cache Memory Manual

Intel® Server System SR1550AL
2.8.3

Over Temperature Protection (OTP)

The PS+PDB will be protected against over-temperature conditions caused by loss of fan
cooling, excessive ambient temperature, or excessive loading. Two sensing points shall be
placed at hot spots; one near the exterior face and one near the interior face of the module. In
an OTP condition the PSU will shutdown. When the power supply temperature drops to within
specified limits, the power supply shall restore power automatically, while the 5 VSB remains
always on. The OTP circuit must have built in hysteresis such that the power supply will not
oscillate on and off due to temperature recovering condition. The OTP trip level shall have a
minimum of 4°C of ambient temperature hysteresis.
2.9

Power Supply Status LED

Each power supply module will have a single bi-color LED to indicate power supply status. The
LED operation is defined below.
No AC power to all power supplies
No AC power to this PSU only (for 1+1 configuration)
Power supply critical event causing a shutdown:
failure, fuse blown (1+1 only), OCP, OVP, Fan Failed
Power supply warning events where the power supply continues to
operate: high temp, high power, high current, slow fan.
AC present / Only 5VSB on (PS Off)
Output ON and OK
The LED is visible on the rear panel of each installed power supply module.
Revision – 1.3
Output Voltage
+3.3V
+5V
+12V1,2, 3, 4
-12V
+5VSB

Table 16. LED Indicators

Power Supply Condition
or
Intel order number D31982-006
OVP MIN (V) OVP MAX (V)
3.9 4.5
5.7 6.2
13.3 14.5
-13.3 -14.5
5.7 6.5
Power Sub-system
Bi-Color LED
OFF
AMBER
1Hz Blink AMBER
1Hz Blink GREEN
GREEN
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