Motorola 900 series - DC Power Enable; Over-Temperature LED Indicator

CPU Module
condition is caused by an AC failure, and the system shut downs,
reestablishment of AC power is sufficient to allow the system to power up and
reboot the system software without the need for human intervention.
There are two jumpers on the IIO distribution board for disable or enable
over-temperature IRQ (interrupt request) and enable or disable hardware
power shutdown.
DC Power Enable
A DC-enable signal located on the power I over-temp RJ45 connector of the
IIO distribution board's front panel is a DC control signal. This DC-enable
signal is a low-true signal driven from the IIO distribution board to all the
SCSI Modules through the daisy-chained RJ45 connector. A high-true version
of this DC-enable signal is driven to all the VME Expansion Modules through
a 140-pin VME Module connector.
This DC-enable signal turns on or off the DC power to all SCSI Modules and
all VME Expansion Modules. It also turns off the system DC power in case the
over-temp condition occurs in any part of the system. If the over-temp
condition occurs in any module, the DC power is turned off to the entire
system. The system is not able to restart until the operator turns the
power I reset key to the reset position on the front panel or cycles the
AC-power for the entire system.
Over-Temperature LED Indicator
2-10
An over-temp signal located on the power I over-temp RJ45 connector warns
the user that the over-temperature condition has occurred in one of the SCSI
Device Expansion Modules. This over-temp signal is an open-collector (low
true) signal which is daisy chained from all the SCSI Modules to the front
panel of the IIO distribution board.
There is an over-temp LED indicator in every SCSI Device Expansion Module.
If the over temperature condition is from one of the SCSI Modules, the user can
check the LED on the SCSI Modules to find out which module exceeded the
temperature specifications. There is a system over-temp LED on the front
panel of the CPU Module. This LED is used to indicate any over-temp
condition in any of the SCSI Device Expansion Modules, VME Expansion
Modules, or the CPU Module.
On every VME Expansion Module, there is a temperature sensing circuit on
each of the VME backplanes. If an over-temp condition occurred in the VME
Expansion Module, an over-temp signal is sent to the I/0 distribution board
through the VME Expansion Module connector. A low true high-temp LED
Reference Guide
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