USV ME400/500/600/650/800
Instruction Manual
ME series
Page 20 of 32
9 Operating and controlling the equipment
9.1 Operating the UPS equipment
The operation of this equipment is indicated by various operating modes and
signals.
9.1.1 Operating modes and signals
The most important operating modes of the UPS are:
Charging mode:
If the mains power is available and the line-side fuse is switched on, UPS
charging mode is enabled.
-> The batteries are already charged, but the UPS has not yet been switched
on.
Display/alarm signal: since the UPS has not yet been switched on, there are no
indicators or warning messages in this operating mode.
Startup mode:
If the mains power is available, the startup procedure is initiated when the
“ON/OFF” switch on the front of the equipment is pressed, then on-line mode is
automatically activated.
If no mains power is available during the startup procedure, the UPS switches
directly to support mode following the startup procedure.
Display/alarm signal: the starting response is indicated by flashing of the
display LEDs.
On-line mode:
If mains power is available and the UPS has completed the startup procedure,
on-line mode is automatically activated.
-> If necessary, the battery pack is charged in this operating mode.
Display/alarm signal: in on-line mode the line LED lights constantly. The line
LED flashes every 0.5 seconds when the charging unit is active. No audible
alarm signal.
