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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
(PERFORM SYSTEM
HALT)
Remote button or switch has to be opened permanently
in terminal strip (X50).
RETURN TO
NORMAL-MODE.
The equipment has to be shut down and de-energized
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