Alpha Technologies Serial System Controller - Manual (Page 10)

10
018-332-C0-002 Rev. B
1. System Overview
© 2001 TM
1.1.2 System Self-Test
System self-test is either initiated by expiration of the Auto Test Countdown timer, or
by asserting the Self-Test switch via the digital transponder interface.
Prior to the test sequence, the SSC will:
• Verify that all XM2s are operating in line mode
• Check the battery capacity and number of strings
• Query the XM2 General Status alarms
The test will not run if:
• Any power supply is in standby mode when the self-test begins
• Either the battery capacity or number of strings has been programmed
to zero
• Any power supply alarm is active
After the above conditions have been met, the SSC will begin the test sequence.
During the test, the SSC will:
• Disable all battery chargers
• Initiate a self-test in a single power supply
Note: Each XM2 auto-test runs to completion before the SSC requests self-
test of the next power supply. Each XM2 in the system is cycled
through its test sequence. If any XM2 reports self-test failure, the
device address of that unit will be reported in the SSC Test Failed
alarm.
• Checks to see if a generator is installed in the system (when switch #3
is in the ON position)
• Asks the SSC to run a self-test of the engine generator (when switch
#3 is in the ON position)
• Turns all battery chargers back on
Test duration is programmed into each XM2 by the SSC. When the Auto-Test Interval
in the master XM2 is reprogrammed, the new value will be detected by the SSC,
which in turn will reprogram all other XM2s in the system.
1.1 Theory of Operation, continued