OMD91046 rev D
49
5.2.13 Diesel generator
The DIESEL GENERATOR Kit allows to preset a UPS for the Diesel Mode function.
The diesel generator interface provides to limit the rectifier output voltage in order not to
recharge the batteries during the Gen Set operation. In this way the rectifier needs a
lower current to feed the DC loads (inverter) and a considerable amount of energy is
saved, therefore the rating of the generator power can be lower.
A contact indicating the Gen Set operation must be connected to two terminals XD1
XD2 already provided on the UPS terminal board.
Picture 32 – Block diagram of Diesel Generator interface
5.2.14 External manual bypass
The EXTERNAL MANUAL BYPASS Kit allows to prearrange an auxiliary contact in
the terminal board (terminals MBY1-MBY2) to be connected to the External Manual
Bypass Switch.
A normally open contact has to be connected to the UPS terminals (MBY1-MBY2);
when the contact is closed (see Manual Bypass procedure), the microprocessor will
acquire the status of the contact and shut down the inverter.
5.2.15 Remote emergency power off (EPO)
The REMOTE EPO Kit allows to prearrange an auxiliary contact in the terminal board
(terminals EAC1-EAC2) to be connected to the External EPO button.
The voltage supply to the loads can be interrupted from a remote location by using
this contact (e.g. for safety requirements). A normally closed contact must be connected
to the UPS terminals (EAC1-EAC2); when this contact is open the static inverter and by-
pass switches are opened so that the output supply is interrupted.
5.2.16 BACK FEED (protection from power return to mains)
This option is standard on 10-20kVA units, while it is optional on 30...60kVA units.
The back feed protection prevents the risks deriving from power return to mains and
from the faults caused by the failure of the SCR’s of the static bypass switch.
