Alpha Technologies XM2, XM2-HV, XM2-HP - Manual (Page 74)

4.7 Automatic Performance Test
Automatic Self-Test: An automatic self test can be periodically performed to verify the
state of the batteries and the inverter circuitry. The automatic test feature has several
programmable parameters that determine the frequency and duration of automatic tests. In
addition to automatic testing, the operator can manually initiate a self-test by pressing ENTER
and DOWN simultaneously. A running test may be halted manually by pressing ENTER and
DOWN a second time.
The test sequence process:
• Begins with a check to verify the batteries are attached and the battery circuit breaker
is closed. If the batteries are discharged or not connected, the power supply does not
attempt to operate in inverter mode, preventing a drop of the load.
• Next, the power supply switches to standby mode for a pre-programmed period.
Successful completion of a test sequence indicates the unit is operating normally in
standby mode, the battery voltage did not drop below a preset threshold and the output
was stable throughout the test. Failure of test is indicated by a Self-Test Fail alarm, which
can be cleared by subsequently running a successful test for at least one minute.
Test Control:
Initiate a manual test (or a running test may be halted) at any time by pressing
ENTER and DOWN simultaneously or by changing the Self-Test switch via the front panel
interface or status communications. A self-test may also be initiated via the status monitoring
card.
To prevent an automatic test scheduled to occur in the next week, issue a Test Inhibit
command. This command is useful if periodic maintenance of the power supply is scheduled
close to the next scheduled automatic test.
This control feature may also be used when inclement weather is expected that might cause
a utility failure. The Test Inhibit command only affects an automatic test scheduled to run
in the next seven days. Multiple issues of the Test Inhibit command result in the deferral of
the next automatic test until at least seven days after the last request. This command has
no affect if an automatic test is not scheduled to take place in the next week. Starting a test
manually overrides the Test Inhibit command.
The automatic test feature is on by default. To turn auto-test off, change Test Interval to 0
days in the Setup Menu. Auto-test may be enabled at any time by changing the test interval
to any numerical value (excluding “0”). The default test interval is 30 days.
Test Countdown: Indicates a pending automatic test.
Test Duration:
The Test Duration is adjustable to meet customer requirements. Exercise
caution when increasing the parameter because long self tests compromise the standby
capability during and shortly after, the test.
Standby Time and Standby Events: Counters that are not incremented during self-tests.
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