Emerson 7400 - Manual (Page 21)

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Series 7400 Single Phase 1+N UPS
Switch S7 - Inverter ON:
Pressing this switch activates the inverter and causes the load to
be transferred to the inverter side of the static switch after the
inverter voltage has had time to stabilise.
Switch S8- Emergency Stop:
When the emergency stop switch is pressed it disables the static
switch block entirely (so removing load power). It also disables the
rectifier and inverter, and trips the battery circuit breaker. Under
normal circumstances it does not remove UPS input power since
this is applied through a manually controller isolator; however, if the
UPS input supply is connected via a circuit breaker having an
electrical trip facility the emergency stop signal can be used to
drive the external circuit breaker’s trip circuit.
There are two LEDs contained within the switch panel area:
LS7 Alarm:
This led accompanies the audible alarm warning when any alarm
condition is initiated. The audible warning can be cancelled by the
reset switch (S5) but LS7 will only extinguish after the alarmed
condition has reverted to normal.
LS8 - Inverter status:
This green led situated near the inverter ON switch illuminates
when the inverter is selected ON.