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0MLMHTK65RUENUB
Components of the block diagrams
The UPS is made up of the following sub-assemblies:
IGBT RECTIFIER
This represents the input stage and its
function is to convert the AC voltage of the
power supply line into DC voltage.
Rectifier start-up can be programmed from the
display panel. The following in particular can
be set:
A delay in start-up t0 – t1 from 0 to 120s
(This allows a non simultaneous start-up of
several UPS’s connected to the same mains);
The time for the start-up, t1 – t2, from 0 to
30s (this avoids overloading a generator that
may be located at the UPS input).
The rectifier carries out the following
functions:
-
Feeds the inverter with DC voltage;
-
Automatically charges the battery;
-
Optimizes the input power factor by means of an automatic charging system.
The system for the cyclical recharging of the battery has two steps.
The first step consists of recharging the battery with limited current and increasing voltage (up to the preset charge
value “Vb_max”). This step is maintained until the battery is fully charged (Batt=100%Ah), which is detected by
measuring the current entering the battery.
In the second step, with the battery fully charged, the battery charger is deactivated so as to remove any residual
current in the battery in order to lengthen its lifespan and to prepare the rectifier for the optimization of the input
power factor.
At this point a 24 hour cycle is automatically initiated to check the state of charge of the battery, initiate an
automatic momentary discharge to verify the condition of the battery, and recharge to full capacity. See page 63 of
this manual to customize or disable this function.
BATTERY
This is the energy reserve to power the load when power is no longer supplied to the UPS. The batteries supplied in
the external RPS Battery Cabinet are sealed and maintenance free. Each RPS Battery Cabinet contains a circuit
breaker disconnect. If a battery pack other than the RPS Battery Cabinet is used then the battery supply
must be
provided with
a circuit breaker device (with auxiliary contact available). See manual battery RPS
When there is no MAINS voltage present (black out), or when the mains goes outside of the specified limits
(frequency or voltage), the load is powered with the energy accumulated in the battery. In this phase of operation
the energy required by the equipment connected to the UPS output is supplied by the battery, which has previously
been charged. The DISPLAY PANEL located on the front of the UPS shows the expected residual BACKUP
TIME, calculated according to the power applied and the state of charge of the batteries. The value provided is an
estimate, since the power required by the connected load may change during discharging. The backup time can be
increased by disconnecting some of the connected equipment. When the remaining backup time goes lower than the
value preset as the END OF BACKUP TIME PRE-ALARM (factory-set at 5 minutes), the buzzer increases the
sound frequency while the yellow BATTERY LED starts flashing; in this condition it is advisable to save any work
in progress. At the end of battery discharge the UPS will interrupt the power supply to the loads.
When the MAINS voltage is restored, the UPS automatically restarts and starts recharging the batteries.
