CPS C3T, User Manual

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4.13 Components of the block diagrams
The CPSis made up of the following sub-assemblies:
RECTIFIER
This represents the input stage and its function is to convert the alternating voltage of the power supply line into direct
voltage.
Rectifier start-up can be programmed from
the display panel. The following in
particular can be set:
The delay in start-up t0 –t1 (this allows a
non simultaneous start-up of several CPSs
connected to the same mains);
The time for the start-up, t1–t2 (this avoids
oversizing any generator that may be located
at the CPS input).
The rectifier carries out the following
functions:
- feeds the inverter with
direct 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 phases.
The first phase consists in recharging the battery with limited current and increasing voltage (up to the preset charge
value “Vb_max”). This phase is maintained until the battery is fully charged (Batt=100%Ah), which is detected by
measuring the current entering the battery.
In the second phase, 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.
A cycle is also automatically effected to check the state of charge and to reintegrate the normal battery auto discharge.
BATTERY
This is the energy reserve to power the load when power is no longer supplied to the CPS. It is housed in one or more
additional cabinets. The battery cabinet
must be provided with
a sectioning device and a protection device (magneto-
thermal switch or disconnector with fuses).
The load is powered with the energy accumulated in the battery when there is no MAINS present (black out), or when
the mains goes outside the acceptance field (frequency or voltage). In this phase of operation the energy required by the
equipment connected to the CPS output is supplied by the battery, which has previously been charged. The
alphanumeric PANEL at the front of the CPS shows the expected residual BACKUP TIME, calculated according to the
power supplied and the state of charge of the batteries. The value provided is merely indicative, 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 these conditions it is advisable to save any work in progress. After this time the
CPSwill interrupt the power supply to the loads.
When the MAINS is restored, the CPS automatically restarts and starts recharging the batteries.
input
current
t
input
voltage
t
black out
t t
0 1
t
2
setting
setting