Hochiki Europe (UK) Ltd – HE-PSU(4.0) Installation Manual
Page 6 of 10
2-3-0-997/ISS1/OCT07
As this is a 24-Volt system, there will be two 12 volt batteries which need to be connected in series. This is
done using the jumper link provided.
To optimise the service life of the batteries, the battery charger output voltage varies with temperature. To
enable optimum temperature compensation, the flying lead thermistor should be attached to one of the
batteries.
4. COMMISSIONING
Once all connections have been made and checked for safety, switch on the mains power. The load should
now be supplied with power and the batteries should be taking a charge.
Check that the load is being supplied by observing the power on lamp on the load (control and indicating
equipment). Remove the mains power and ensure that the batteries continue to supply power to the load.
With the mains removed, a negative signal should appear at the terminal MF (mains failed) and the MF LED
should light after about 90 seconds. This can be checked by connecting a voltmeter between load + and
terminal MF.
Switch the mains back on and disconnect the battery. The load should continue to operate and a negative
signal should appear at the terminal BD (battery disconnected) and the BD LED should light after about 30
seconds. Check this with a voltmeter between load + and the terminal BD.
Now connect the load + terminal to earth using a piece of wire. Within 30 seconds a negative should appear
at the terminal EF (earth fault) and the EF LED should light.
Disconnect the load + from earth and connect the load - to earth. Within 30 seconds a negative should
appear at the terminal EF and the EF LED should light.
With the battery disconnected, measure the output voltage from the power supply battery terminals with a
calibrated digital voltmeter. The voltage should be within 0.2 Volts of the value indicated on the
voltage/temperature graph (see opposite page.).
This completes the basic commissioning checks.
5. MAINTENANCE
THIS EQUIPMENT CONTAINS NO USER SERVICABLE PARTS
The power supply requires no maintenance; however, sealed lead acid batteries have a limited lifespan and
should be checked periodically in accordance with the manufacturer’s recommendations.
It is advisable to check the battery charger output voltage once per year to check that the output has not
drifted.
