Series 7400 Single Phase 1+N UPS

LED

NORMAL

ACTIONS TO BE TAKEN IF ABNORMAL

NUMBER

STATE

 

 

 

 

LS4

ON

If this led is OFF it signifies that the inverter is not

 

 

producing its correct output voltage.

 

 

Check the following:

 

 

a) If [OVERTEMPERATURE] OR [OVERLOAD] alarm

 

 

messages are active then (after allowing the

 

 

UPS to cool / checking that the load current on

 

 

the bypass line is not excessive) press the reset

 

 

switch on the UPS Logic Board.

 

 

b) Press the Inverter ON pushbutton

 

 

c) If the dc busbar is below 320V (330V for 80-125

 

 

kVA) then do checks as per LS1 above

 

 

d) Check that slide switch I3 is closed on the UPS

 

 

Logic Board is closed.

 

 

e) If the inverter works OK when mains is available

 

 

but not when mains is unavailable then check

 

 

the dc power supply fuses.

 

 

If the above checks prove unsatisfactory then seek

 

 

qualified assistance.

LS5**

OFF

If this led is ON then it signifies that the load has been

 

 

transferred to the static bypass supply and the output

 

 

circuit breaker is closed. This indication should be

 

 

mutually exclusive with LS6 described below - check

 

 

out LS6 actions.

LS6**

ON

If LS4 is also OFF then refer to LS4 checks.

 

 

If LS6 is OFF but LS4 is ON then check the following:

 

 

a) Ensure that the output isolator is closed then

 

 

press the Reset button on the UPS Logic Board.

 

 

b) Ensure that slide switch l3 on the Static Switch

 

 

Logic Board is in the AUTO position.

 

 

If the above checks prove unsatisfactory then seek

 

 

qualified assistance.

 

 

 

**Note that in one-plus-onesystem configured with a redundant module, it is possible for one of the two modules to shut down (due to fault for example) without turning on its static switch. In fact when in a redundant module configuration a module’s static switch is disabled whenever its partnering module is on line. Therefore in the event of a fault you are likely to see LS4, LS5 & LS6 all OFF.

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Emerson 7400 user manual LS4

7400 specifications

The Emerson 7400 is a state-of-the-art control system designed for industrial applications, offering enhanced performance and reliability in process automation. This robust device is a part of Emerson's larger DeltaV system, known for its scalability and flexibility in various operational environments.

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