INSTALLATION INSTRUCTIONS
Hydrosense ID Addressable Water Detection System
Document Part No. 3500039 Issue:01
Page | 20 of 32
15. Power Supply
The control panel is fitted with a 2.3 Amp power supply and battery charger capable of charging up to 9 Ah
batteries. A separate power supply should be used if larger batteries are required.
The power supply requires a 230 VAC mains connection to the fused, mains terminal block in the top left corner
of the back box.
The power is split between the charging circuit and power supply such that a maximum of 1 Amp is available to
charge the batteries if required, which leaves 2 Amps to run the control panel and peripherals. If the batteries are
fully charged and do not require any power, the full 3 Amps is available to run the control panel and sounder
load.
The power supply incorporates sophisticated monitoring of the condition of the power system. The battery
charging output is temperature compensated to maximise the service life of the batteries.
The following fault conditions are signalled at the control panel: -
•
MAINS FAILED
•
BATTERY DISCONNECTED
•
BATTERY LOW VOLTAGE
•
EARTH FAULT
The mains fuse fitted is a T1.6A 250V HRC 20mm type and must be replaced upon failure with a fuse of the same
type to maintain the safety rating of the power supply.
15.1. Aux. 24V Supply
A separately fused auxiliary 24 Volt output is provided for powering additional I/O boards or other equipment
connected to the Hydrosense ID system. When switching inductive loads such as relays, these should be
adequately suppressed using a reverse connected diode.
The “Aux. 24V” supply fuse is of the self-resetting type and is rated at 500 mA. Failure of the fuse is monitored
by the system and announced as "Aux. 24V” fuse failed.
The impact on battery standby duration must be carefully considered when using the “Aux 24V” Output. Constant
use of the full 500 mA capability of this output for instance would require an additional 15 Ah of battery capacity.
Ideally, use of the “Aux. 24V” Output should be restricted to powering a limited number of additional I/O boards
or switching equipment when an Alarm condition occurs.
15.2. 24V OUT Terminals
The terminals on the circuit board marked “24V OUT” should not be used for any part of the installation. These
terminals are reserved for powering additional equipment that is factory fitted only. Using these outputs to power
equipment outside of the panel enclosure will compromise the integrity of the system.
15.3. Remote PSU
The terminals marked “Remote PSU” are for the connection of a remote power supply. These terminals are used
on control panels that have an external power supply and larger batteries in cases where standby periods longer
than 24 hours are required.
There are two sets of terminals, which allow two transmission paths to be accommodated. A Power Fault Input is
also provided to signal faults from a remote power supply on the Hydrosense ID Panel.
15.4. Battery Capacity
To enable the system to continue to function in the event of a failure of the mains supply, batteries must be
fitted. These are not supplied with the control panel and must be purchased as a separate line item.
Batteries should be of the re-chargeable, sealed lead acid type. They should be new (less than six months old)
and sized according to the local codes of practice for the standby period required, preferably by measuring
quiescent and alarm loads for the particular hardware configuration installed or using the formula listed below to
calculate the required capacity.
The battery capacity required can be calculated using the following information.
This table shows the panel current consumption but does not take into account device loads, additional I/O
boards, or use of the “Aux. 24 Volt” output. Systems using these facilities should have their battery size
calculated according to the additional information below.
