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5.3. Emergency power off (EPO) operation

Emergency Power Off (EPO) is equivalent to a complete unit system halt:

All UPS converters are turned off (rectifier and inverter off).

No output voltage is supplied to the loads.

See table below for operation:

E.P.O. function

Terminals (X50).

 

Normally closed circuit by means of the provided cable

 

bridge (it allows an external switch (EPO)).

 

 

Activation

Remote button or switch has to be opened permanently

(perform System

in terminal strip (X50).

Halt)

 

Return to

The equipment has to be shut down and de-energized

normal-mode.

completely (turn off all switches), wait until DC bus is

 

discharged (all LEDs and LCD have to be turned off).

 

The equipment has to be started up according to

 

section 5.1.2. “Start-up procedure”.

 

 

Table 3:  Emergency Power Off (EPO) operation

Note: In parallel mode it is sufficient , when the emergency shutdown is activated for one UPS.

5.4. Bypass manual switch (Maintenance)

5.4.1. Principle of operation

The integrated manual bypass of the UPS is a very useful element, but unwarranted use can have irreversible consequences both for the UPS and for the loads connected to its output. It is therefore important to handle it as described in the following paragraphs.

5.4.2. Transfer to maintenance bypass

Note: The bypass switch connects the load at the electrical output before the input switch (Q1a) and after the output switch (Q2). In practice, the input switch is combined directly with the output terminals. If you switch off all of the other switches after switching on the bypass switch, the UPS is internally without power (neutral conductors are not connected.) For equipment fitted with internal

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AEG 2.33 2 user manual Emergency power off EPO operation, Bypass manual switch Maintenance Principle of operation

2.33 2 specifications

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