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R&D – PROCEDURA START-UP DT 0419 – E02
1.5.3
LOGIC AND AUXILIARY CIRCUITS
The control logic occupies the separate board (CS0119) and represents the “intelligence” of the UPS.
It manages operations of the step-up converter, inverter and by-pass, based on feedback signals taken
from the power module. The control logic also manages the other three boards: the battery charger,
auxiliary power supply and signal interface.
The battery charger handles recharging of the outside batteries connected to the UPS.
The signal interface receives the signals from the control logic and converts them into the protocol required
by the front panel of the UPS and also the relays board. Going backwards, the selected commands from
the front panel (automatic by-pass forcing) and/or relay board (EPO) are sent from the signal interface to
the control logic which interprets them and performs desired operation – like switch on/off inverter or shut
down the unit.
The signal interface, except controlling standard relays board, can also control another (optional) one.
The auxiliary power supply supplies all the boards and electronic components in the UPS.
1.5.4
BATTERIES
The battery set provides energy to the system when the input mains is out of the allowed range
or not present; in all other cases batteries are constantly recharged by the charger module. In this way the
batteries are always ready for use when required.
1.5.5
MANUAL BY-PASS
The manual by-pass is useful in the situations, when it is necessary to disable the UPS and keep the load
supplied by the mains (i.e.: UPS stopped, fault, etc.). can be activated with using the MANUAL BY-PASS
(l3) switch, located in the front part of the UPS (refer to chapter 4). In normal operating conditions this
circuit breaker remains in rest position, protected with the mechanical lock (the padlock).
1.5.6
FRONT PANEL
The UPS can be managed via the front panel. Using the panel it is possible to execute the commands,
display states and measurements and reset the alarm circuits.
The panel is equipped with an LCD screen used to display the operating status of the UPS, the load and all
types of measurement (see chapter 3)
