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The Intel® Server Platform SRPL8 can operate with input voltages of 200-240VAC or 100-120VAC. A Force_AC_OK jumper (J7F3) located on the midplane board selects the input voltage at which the server will operate. The jumper also enables/disables the brown out recovery feature that aids server startup during slow ramping AC input voltage conditions.
| Jumper J7F3 Position |
Valid AC Input Range |
AC Main |
Brown Out Feature |
| Installed |
200-240VAC
or 100-120VAC |
15A
15A |
Disabled
Disabled |
| Removed (Default) |
200- 240VAC |
15A |
Enabled |
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Enabling the brown out feature ensures that all power supplies will turn on when the AC input voltage reaches at least 180VAC following an AC main brown out condition.
Disabling the brown out feature can cause power problems when the system tries to recover from a brown out condition. The problems that can result depend on server AC input voltages.
- For 100-120VAC input power after a brown out: AC input voltage may slowly rise to its nominal level and because of slight differences in power supply turn on thresholds at 90V, one power supply may turn on before the others. This power supply will most likely see too large a DC load and shut down (other power supplies may do the same), removing all DC voltages from the server. 5V standby voltage would be maintained as long as at least 90V is present at the AC input to the system.
- For 200-240VAC input power after a brown out: AC input voltage may slowly rise to its nominal level and the power supplies turn on at 90V doubling the current load on the AC main and causing them to trip.
See the Server SRPL8 Product Guide for more details on power supply input voltages.
This applies to:
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