D-4 SPARC Enterprise M3000 Server Service Manual • March 2012
On: Indicates that the contact is closed.
Off: Indicates that the contact is open.
Note 1: Use a UPS that can normally supply power from the battery at least 10 to 60 seconds after *BTL is turned on.
Note 2: Use a UPS that can normally supply power from the battery within 2 seconds of a momentary commercial power interruption
even if *ACOFF is not turned on.
D.4 Power Supply Conditions
TABLE D-2 and TABLE D-3 show the power supply conditions of the UPC interface.
D.4.1 Input Circuit
Limit the signal line chattering period to 1 ms.
*ACOFF Indicates that a power failure has occurred in the
commercial power supply connected to the UPS.
9 Normal state: Off
Abnormal state: On
(Note 2)
SG Signal ground 5
ER
(Equipment Ready)
Indicates that the server is operating 1 Do not connect
anything to this pin.
TABLE D-2 Input Power Supply Conditions
Signal Name Input Conditions
*BPS/*UALM No voltage relay contact
*BTL Contact rating DC 12 V, 10 mA or greater (0.5 A maximum)
*ACOFF Use of a gold-plated contact or reed relay is recommended.
TABLE D-1 Signal Line Definitions (Continued)
Signal Name Definitions Pin Number Remarks
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