Alpha Technologies CFR 600, CFR 600XT, CFR 1000 - Manual (Page 47)

5.10 Maintenance Parameters
Max. PLL Slew Rate
Increasing this value will reduce the speed at which the Phase Locked
Loop (PLL) will change the output frequency while the UPS resumes LINE
PRESENT operation after a line fault has been corrected. It will also increase
the time required to resume LINE PRESENT operation.
Battery Warning Ref
Increasing this value will increase the time before a LOW BATTERY
WARNING occurs, thus allowing the batteries to drain more of their charge
before a warning is given. Decreasing this value will allow more run time
between LOW BATTERY WARNING and SHUTDOWN.
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5. RS-232 TERMINAL COMMUNICATION
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