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MI00/10056 rev. 8 —05/2006
5.4 Signal connections
a) Emergency Power Off
When the connection between terminals 1 and 2 is opened, the UPS will stop, and it will automatically
restart when the switch is closed. This allows a remote E.P.O. to be installed, in series with the standard
one installed inside the UPS. (See Para. 9.1)
Warning: To avoid unauthorized stopping, it is strongly recommended that some form of security switch be used..
b) Battery charge inhibited
By removing the link between terminals 3 and 4, the battery charge will be inhibited, and a warning
message will be displayed.
Possible uses of this could be one, or more, of the following:
• connect the above terminals to a contact which will be opened if there is Hydrogen within the battery
compartment(s).
In this way the cause of hydrogen generation will be stopped, and a warning about the operating
status of the system will be displayed.
• connect the above terminals to a contact which will be opened when the UPS is supplied by a
Generator (it should be an auxiliary contact of the Line <-> Generator changeover).
In this way it will be possible to limit the power supplied by the Generator to the only value required to
supply the critical loads, and not to charge the battery until the mains supply returns.
In this way it is possible to use a Generator having a power rating less than the maximum input power
of the UPS.
Also in this case a warning about the operating status of the system will be displayed.
c) Thermostick connector (50/80kVA only)
This connection provides the customer with remote control over the output transformer Overtemperature
Alarm (T
CORE
= 180°C).
NOTE: If more than one of the above applications (or similar) are installed, the contacts MUST be connected in
series.
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