APC SYMMETRA 990 - Manual (Page 25)

Symmetra MW with External Bypass Static Switch Operation Manual - 990-1377D-001 21
Maintenance
Predictive Maintenance Screens
The Predictive Maintenance screens display the stress status and the Expected Remaining Lifetime (ERL)
of the critical components of the Symmetra MW UPS system.
Warning: Only personnel trained in the construction and operation of the equipment,
and the electrical and mechanical hazards involved, may install or remove system
components.
How to access Predictive Maintenance screens
Inverter DC Capacitors screen
The Inverter DC Capacitor screen displays the actual status and Expected Remaining Lifetime (ERL) of
the Inverter DC Capacitors. You can sort the data by pressing any of the column labels.
• Stress Status: Shows the actual status of the
Inverter DC Capacitors. The possible values
are:
– Normal (displayed in green)
– Stressed (displayed in yellow)
– Major Stress (displayed in red)
• ERL (months): Predicts the expected
remaining lifetime of the particular
component.
 Press the Operation button in the bottom
left corner to access the Operation screen.  Press the Predictive Maintenance button to
access the Predictive Maintenance screens.