Datasheet
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TSPC-240UPS Series
Function Specification
Function Diagram:
General Description
This power supply is supplied by mains voltage and contains an integrated DC uninterruptible power supply feed by an external bat-
tery. It is designed to supply the applied load continuously and without interruption, even when the mains power fails. In this case, the
energy is supplied from an external 12V battery to provide the required output voltage. The unit is designed to operate with lead-acid
batteries
Operation
Before the first use, the AC input range should be set by the slide switch. During the normal operation, when the input AC voltage is
present, the output DC voltage is delivered by internal AC/DC power supply.
In case of power failure the internal battery discharge regulator is activated. The output voltage will be still maintained at the reduced
level of 23.6V (typically at Vnom) without any interruptions. The battery discharge operation will continue until AC input voltage reco-
vers.
If the input AC voltage does not recover, the battery voltage will continue to drop, while continuously delivering the output power at re-
quired voltage level. In order to prevent the deep discharge of the battery, which can lead to battery failure, the battery is disconnected
at the deep discharge threshold. The BAT OK signal will be OFF when the battery voltage is approaching the disconnection voltage
level. This can enable early warning of the system.
If the input AC is present at the right level, the battery is automatically charged to the set voltage level. This level is factory set for 25ºC
for lead-acid batteries. The user can change this voltage by using the built-in potentiometer. The adjustment can be made only if the
battery is disconnected (after initial operation) to prevent from adjustments errors. The battery test interval should be set to 10 minutes
(factory settings). If the battery is operating at a different ambient temperature (not 25ºC), the user can adjust the set battery voltage to
the required ambient temperature, as recommended by the battery manufacturer.
After adjustments – the battery should be re-connected. It is also possible to use the temperature compensation probe to automatically
compensate the end battery charge voltage for any temperature changes. In this case, there is no need to change the potentiometer to
compensate for a new ambient temperature.
The internal state of charge of the battery is tested at regular intervals with internal current pulse. The interval is factory set to 10 mi-
nutes. It can be changed to 15s for test purposes by changing the slide switch position on the front of the unit as indicated on the label.
If the battery OK signal is OFF, even after prolonged charging, the battery pack needs replacement. The buffer function (during input
power failure) can be disabled remotely, and the battery is disconnected. It can be achieved by pulling the Remote ON/OFF pin to
GND (with contact relay or transistor).