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LST700 SERIES FIRE ALARM PANEL
SECOND FIX
Connecting the panel
Connecting the panel's internal connections and PCBs is best undertaken immediately prior to
commissioning.
Before you begin, we recommend you check all devices on the detector and sounder circuits are
correctly connected (see pages 7 and 8) and that cable integrity is verified throughout the installation.
Important: DO NOT use a high voltage insulation tester with any electronic devices connected.
Faults occurring in the wiring which are not picked up at this stage will almost certainly result in
spurious and intermittent faults when the equipment is energised.
Installing the Power Supply PCB
The panel's Power Supply PCB combines the functions of a mains to d.c. switched mode power
supply unit, battery charging unit and battery monitoring unit.
Under no circumstances should the fire alarm panel be operated without the Power Supply PCB
correctly mounted in the panel's enclosure and the three retaining screws securely tightened.
The PCB should be positioned in the panel as shown in figure 9 on page 11.
Connecting the mains
The general requirement for the mains supply to this equipment is described on page 6.
DO NOT attempt to connect mains to the panel until you are fully conversant with the layout and
features of the Power Supply PCB, as described above and in figure 9 on page 11.
The incoming mains cable should be brought into the panel at the top right hand side of the
enclosure and terminated at the connector block (CONN1) on the Power Supply PCB.
Make sure the mains earth wire is connected directly to this connector block and NOT to the
secondary base earth post which is provided for making off detector and sounder circuit screens.
Connecting the stand-by batteries
Two new, good quality and fully charged 12V valve regulated lead acid batteries are required as
the emergency stand-by power supply for the panel. Caution: No other type of batteries should
be used due to risk of explosion.
The batteries should be connected in series and located in the panel's enclosure as shown in
figure 10 on page 11. The battery leads, link wire and nylon cable ties are provided in the panel's
accessory pack. Run the battery leads through the slits in the panel's lower plastic ribs and
secure the batteries into position using the nylon cable ties as shown.
The panel's sophisticated battery monitoring unit protects the batteries against deep discharge by
activating a cut off circuit when the stand-by supply voltage reaches 21V approx. If batteries are
not fitted, are discharged or in poor condition, a PSU fault will show at the fire alarm panel.
The capacity of the batteries used will depend upon the required stand-by time. To calculate the
batteries required for any given stand-by period, please refer to the calculation guide on page 23.
Always dispose of used batteries according to the battery manufacturer's instructions.
10
WHEN CONNECTED, THE POWER SUPPLY PCB STORES VOLTAGES AT UP TO
400Vd.c. AND MAY BE LETHAL IF TOUCHED. DO NOT TOUCH THE PCB WHILST
THE RED 'HAZARDOUS VOLTAGES PRESENT' INDICATOR IS LIT.
The Power Supply PCB's earth strap MUST be connected to the spade on the chassis
earth post before operation. The spade is compressed against a shoulder on the post
via the lowest nut. The earth post may appear loose, this is intended by design.
LST700 SERIES INSTALLATION & MAINTENANCE MANUAL • Approved Document No. DFU7002012 Rev 4
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