18
Installation instructions
Power supply stations
Figure 9 - Connecting the batteries
The batteries are the secondary power supply of the system. The power supply station monitors the battery
status (efficiency and charge). The battery-test circuit of the power supply station operates as follows:
• Efficiency test
The station tests the battery efficiency every 10 minutes. If their internal resistance is over the allowed
limit, the event will be signaled, according to the amendment EN54-4:1997/A2.
• Battery level test
The battery-test circuit monitors the battery status (efficiency and charge) continuously.
In the event of mains failure, the power supply station will still monitor the battery voltage continuously.
If the voltage drops below 22.8V, the power supply station will signal the fault. Fault condition will be
reseted when the voltage restores to 24.6V.
• Deep discharge shutdown
If a mains failure event lasts for a long period, causing the battery voltage to drop below 18V, the power
supply station will shutdown the batteries in order to avoid permanent damage.
5.4
Thermal probe
Attention:
In order to validate the IMQ-SISTEMI DI SICUREZZA certification and comply with EN 54-4
requirements, installation of a thermal probe is essential.
The thermal probe regulates the charging process in accordance with the battery temperature. The thermal
probe protects against battery overheating and consequent permanent damage.
5.4.1 Connecting the thermal probe
Connect the thermal probe to the proper connector of the power-supply module (Figure 6 - Switching
power supply, [D] and Figure 9 - Connecting the batteries, [D]).
Using adhesive-insulating tape, attach the thermal probe to one of the batteries, in order to provide
optimized heat-transfer measurements.
B
B
A
A
C
D
C
D
SPS24060S
power supply
C
D
SPS24160S
power supply
