253 Operation
Vertiv™ | Liebert® PSI5 120V Input / 120V Output & 208V lnput / 208V Output Installer/User Guide
SETTING NUMBER SETTING OPTIONS
09
(12 on TAA models)
Set the sensitivity of acceptable input voltage quality. When distortion or disturbances are detected on
the input voltage, the UPS protects the plugged-in equipment by switching to Battery mode. The lower
the sensitivity setting, the less frequently the UPS switches to battery, but the more distortion and noise
may be passed through to the plugged-in equipment. If you are using a poor quality input source such as a
generator or step-wave source on which your equipment can fully operate, a lower sensitivity setting may
provide longer battery life and run times.
• ST1 - High sensitivity (default). Provides the maximum protection. The transfer time is typically 4 to
6 ms, 10ms max.
• ST2 - Medium sensitivity. Provides medium protection. The transfer is typically 6 to 8 ms, 11 ms max.
• ST3 - Low sensitivity. Provides the least protection but may provide longer battery life and run time
for tolerant equipment. The transfer time is typically 8 to 10 ms, 13 ms max.
13
(Only available on TAA
models)
Resets the UPS Power On Counter to 0. This counts the number of times the UPS has been powered on
since the rst startup or the last time it was reset.
• YES – Reset the counter to 0
• NO – Do not reset to 0 and return to setting selection
14
(Only available on TAA
models)
Resets all UPS Settings to their factory defaults.
• YES – Reset to factory default settings
• NO – Do not reset to factory defaults and return to setting selection
00 Exit Settings mode.
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