www.pulsar.pl
EN54-5A17LCD
RED POWER
38
8. Reserve power supply circuit.
The PSU is fitted with intelligent circuits: battery charging circuit with the function of the accelerated
charging and battery control, which main task is to monitor the condition of the batteries and the connections in the
circuit.
If the controller detects a power failure in the battery circuit, appropriate indication and activation of the APS FLT
and ALARM technical outputs takes place.
8.1. Battery detection.
The control unit of the PSU checks the voltage at the battery terminal and, depending on the measured
values, determines the appropriate reaction:
U
BAT
below 4V - batteries not connected to the PSU circuits
U
BAT
= 4 to 20V - faulty batteries
U
BAT
over 20V - batteries connected to the PSU circuits
8.2. Protection against short -circuit of the battery terminals.
The PSU is fitted with the circuit protecting against short-circuit of the battery terminals. In case of short
circuit, control circuit immediately disconnects the batteries from the rest of the power supply circuit, so the loss of
output voltage on power supply outputs is not observed. Automatic reconnection of the batteries to the PSU's
circuits is only possible after the removal of the short-circuit and correct connection of the circuits.
8.3. Protection against reverse battery connection.
The PSU is protected against reverse connection of the battery terminals. In case of incorrect connection,
the F
BAT
fuse in the battery circuit becomes damaged. The return to normal operation is possible only after
replacing the fuse and correct connection of the batteries.
8.4. Deep discharge battery protection UVP.
The PSU is fitted with the disconnection system and the battery discharge indication. If the voltage at the
battery terminals drops below 20V±0.2V during battery-assisted operation, acoustic indication will be activated and
the batteries will be disconnected within 15s.
The batteries are reconnected to the power supply unit automatically once the AC mains supply is restored.
8.5. Battery test.
The PSU runs dynamic battery test every 5 minutes, temporarily switching the receivers to the battery
operation mode. During testing, the control unit of the PSU measures the electrical parameters according to the
implemented measuring method.
A negative result occurs when:
- the battery circuit continuity is interrupted,
- resistance in the battery circuit increases above 300 m
Ω
- the battery terminal voltage drops below 24V.
The battery test can be activated manually from the main menu (see section 7.2.1), for example to test the
replaced batteries.
The PSU is protected against too frequent performing of the battery test, which could result in
undercharging. The protection involves blocking the ability to perform test for 30 seconds from the last activation.
Ι
n this case, the LCD will display the "WAIT” message in the PSU Settings -> PSU -> Battery test menu.
Fig. 27. Temporary lock of the battery test.
This function can be disabled by putting the Z2 jumper on the power supply board (Fig.2 [8]).