Datasheet
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TSPC-240UPS Series
Signals
Following signals are made available as LED indicators and corresponding isolated relay contacts:
AC-OK Indicates if the input AC voltage is present. During operation outside the DC specification (overload), at low input
AC levels (below nominal range) it can be OFF. It will indicate that the battery operation has started in order to
maintain the output voltage at 24V level.
BATT-OK: Indicates if the battery is charged properly and has low internal resistance. During battery discharge operation this
signal monitors the battery voltage. If the battery voltage approaches the disconnection voltage – it is OFF. This ena
bles early warnings of the system. The threshold of this signal is about 1V higher than the battery disconnection
voltage.
Note that if the battery signal was OFF during the normal operation (when input voltage is present) – it will stay
OFF during the battery discharge operation as well.
DC-OUT-OK: Indicates that the output voltage is higher than 82–90% of the nominal output voltage.
Battery
When the input AC voltage is present, the TSPC-240UPS unit will automatically charge the connected battery to a set end of battery
charge voltage level, factory set for 25ºC for lead-acid batteries, using a constant current charging method of 1A (typical). As the
battery voltage approaches the end of battery charge voltage level, the current will decrease proportionally; this characteristic is shown
in Fig 1. The user can adjust the set end of battery charge voltage level by means of the “Battery Voltage Adjust” potentiometer.
The module also provides an input connector for a temperature compensation probe. If this probe is connected, the unit will automati-
cally compensate the end of battery charge voltage level depending on the measured temperature. The connection of the temperature
probe also negates the need to change the potentiometer to compensate for a new temperature. The battery end voltage compensation
curve is shown in Fig. 2. (Applicable to factory setting of 13.6V/ 25ºC)
Battery Protection
The module protects the connected battery against short circuit and overload by the means of a built in 30A fuse. This fuse is a stan-
dard 30A blade type fuse, which is accessible from the front panel of the unit for ease of replacement should the fuse be damaged
during operation.
It also prevents deep discharge of the battery by disconnecting the battery from the load once the voltage level of battery has dropped
below a defined threshold. An early warning of this disconnection is given to the user by means of the BATT-OK signal (see chapter
2.6.2). The BATT-OK signal will switch off when the battery voltage is roughly 1V above the deep discharge threshold.
Function Specification (continued)
Figure 2
13.0
13.2
13.4
13.6
13.8
14.0
14.2
14.4
14.6
14.8
15.0
-15-10 -5 0510 15 20 25 30 35 40 45 50
[V]
[ºC]
Battery End of Charge Voltage with Temperature Sensor
End of Charge Voltage
Figure 1