Man-1131_Hydrosense_HSCP_01
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18.3 CPU fault
Indicates that the central processor unit has failed to correctly execute code and has been re-started by the
system watchdog. The watchdog reset switch must be pressed to clear the CPU fault condition.
Press watchdog reset. If system does not return to normal then the panel is probably damaged and needs
the circuit board replacing. (See maintenance section).
18.4 Aux 24V fault
The Aux 24V and R0V terminals provide a 500 milliamp, 24V DC power supply for power alarm ancillary
equipment. This LED indicates that fuse protecting the R0V output has operated and the rating of this output
has been exceeded. The fuse is a self resetting type and the supply will resume when the fault condition is
removed.
18.5 Batt low
Illuminates when the system is running on batteries and the battery voltage is lower than 21V +/-2% (the
minimum battery voltage).
18.6 Earth fault
Indicates that part of the system wiring is connected to earth. Remove all system wiring and re-connect
cables one at a time until the earth fault returns. This will indicate which cable the earth fault is present on.
18.7 Sys fuse fault
Indicates that the total power rating of the power supply has been exceeded and that the system fuse has
come into operation. Remove and review all loads and re-connect one at a time until over rated circuit trips
fuse to identify troublesome circuit.
18.8 S1 fault and S2 fault
Indicates a short or open circuit on sounder outputs. Remove wiring and refit end of line resistors. Check
sounder circuit wiring.
18.9 Comms fault
Indicates that communication has been lost with a repeater panel or Ancillary board. Check for comms fault
at all repeaters and ancillary boards to identify the source of the problem.
19. Power supply
The control panel requires a 230V (+10%/-15%), 50/60Hz, AC mains power supply which connects to the
fused terminal block labelled “230V”.
The fused terminal block contains a 20mm, F1.6A L250V fuse which should only be replaced with a similar
type.
The output voltage of the power supply is 28V DC +/- 2V and the total current rating including a maximum
0.7A for battery charging is 3 Amps. Fuse F12 mounted on the circuit board is a self-resetting electronic fuse
rated at 4 Amps.
The incoming mains cable should be routed well away from other lower voltage wiring by a distance of at
least 50mm.
Mains wiring should include an earth conductor which is securely bonded to the building earth and should
enter the enclosure as close as possible to the mains terminal block. Mains wires should be kept very short
inside the enclosure and secured together close to the mains terminal block with a cable tie.
The control panel can accept sealed lead acid rechargeable batteries of up to 7Ah maximum capacity (see
table 2 for battery size required for each model).
The maximum current drawn from the batteries when the main power source is disconnected is 3 Amps.
Battery leads are supplied wired to the PCB along with a link to connect the two batteries in series. The PCB
is fitted with a 20mm, 3.15A T1 glass fuse (F13) in the battery charging circuit which must only be replaced
with one of the same type.
It is most important that the polarity of the batteries is carefully observed when connecting.
When the batteries are discharged to a level at which a low battery indication is given, the BATT FAIL
indicator will also be lit.
Wrongly connected batteries could cause damage to the control panel.
