Emerson 7400 User Manual
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Series 7400 Single Phase 1+N UPS
LS5 - Load on bypass:
This led illuminates when the output isolator is closed and the load
is connected to the bypass via the static switch.
LS6 - Load on Inverter:
This led illuminates when the output isolator is closed and the load
is connected to the inverter via the static switch.
Control switches
Seven tactile switches are located on the Operator Panel, together
with an emergency stop push button which is fitted with a safety
cover to prevent inadvertent operation.
Switch S1 (Vo) - Output volts:
When this switch is pressed, the lower line of the LCD Display
shows the output phase voltage w.r.t neutral.
Switch S2 (Fo) - Output frequency:
When this switch is pressed, the lower line of the LCD Display
shows the output frequency.
Switch S3 (Io) - Output current:
When this switch is pressed, the lower line of the LCD Display
shows the output current.
Switch S4 (B) - Battery:
When this switch is pressed, the lower line of the LCD Display
shows the battery voltage and current. Note that a discharging
current is symbolised by a preceding minus (-) sign, plus autonomy
time is displayed according to % load for SMF batteries.
Switch S5 ((
•)) - Alarm reset:
Pressing this switch cancels the audible alarm. The alarm led and
messages will remain active if a detected fault condition is still
present.
Switch S6 - Inverter OFF:
Pressing this switch turns OFF the inverter and causes the load to
be transferred to the static bypass supply.
ALARM
MEASUREMENTS
INVERTER
EMERGENCY
Vo
f
I o
B
ON
O F F
S2
S3
S4
S5
LS7
S7
LS8
S6
S8
((•))
S1
Figure 8: Control Panel Switches