Man-1131_Hydrosense_HSCP_01
Page 9 of 18
10. Aux 24V DC supply
An auxiliary 24V DC supply is provided to enable local signalling or control of ancillary systems such
graphical mimic displays.
The terminals for the Aux 24V supply are labelled Aux 24V and ROV. The ROV terminal is the negative
terminal and is the same terminal that should be used to switch the remote control terminals.
It is possible to make the ROV terminal pulsing so that by connecting it to the AL terminal via a remote, volt
free contact, it can be used to pulse the dedicated sounder circuits in response to a signal from another
system for example to give an alert. See programming code 24.
The supply is fitted with an electronic self resetting fuse to protect the control panel’s 24V supply in the
event of a wiring fault.
Any standing load on the Aux 24V supply must be taken into account when calculating battery standby times
as standby time will be significantly affected by even modest standing loads. It is recommended that the
Aux24V output is
not
used to power standing loads and not used to supply loads of greater than 300
milliamps
Where the Aux 24V supply is used to power electromechanical devices such as relays it is imperative that a
suppression diode is fitted across the coil of the electromechanical device to prevent the generation of high
voltage transients back to the control panels power supply.
11. Connection to relay contacts
Volt free changeover relay contacts are provided for local control and signalling if required. These contacts
are rated for switching signalling circuits only and the maximum ratings listed in table 1 on page 5 should
not be exceeded under any circumstances.
Fault relay
The fault relay is normally energised and will de-energise upon any fault condition including total loss of power.
Local alarm relay
The local alarm relay will energise upon activation of an alarm condition on any of the zones or pressing of
the sound alarm button on the front panel. The relay will remain activated until the alarm is silenced or the
panel is reset. This relay will not operate upon activation of the remote AL input or when an alarm condition
is triggered on a zone that is in test mode.
Alarm relay
The alarm relay will energise upon activation of an alarm condition on any of the zones. The relay will
remain activated until the control panel is reset. This relay will
NOT
operate upon activation of the remote
AL input. Individual zones can be configured not to operate the Alarm relay by setting configuration options
E1 to E8.
12. Connection to Repeater panels
Repeater panels connect via a 2 core cable to the terminals marked RS485 + and – on the HYDROSENSE HSCP
main control panel PCB. Up to 7 repeaters may be connected and each repeater has terminals for the
incoming cables and outgoing cables. All except the last ancillary board, sounder board or repeater panel
connected to the cable must have the jumper links J2 removed.
Set the repeater address using the DIP switch (SW7); ensure no two repeaters share the same address.
Apply power to main panel first and then all repeater panels. Turn on the Enable Control keyswitch and set
the Write Enable switch to on then briefly press the PROCESSOR RESET button on the main panel. Wait for a
few seconds and the main panel will show the addresses of the repeaters that were found on the display for
instance r1 indicates that a repeater at address 1 has been found.
Turn the write enable switch of, then on again and then press the ENTER button to accept each repeater
that has been found. When all repeaters have been added, set the main panel Write Enable switch to off.
Press the Watchdog reset switch on the main panel.
All repeaters are now configured and the main control panel will report a fault if any repeaters that have
been accepted become faulty or go off line.
For full details of commissioning procedures for repeaters see the HYDROSENSE HSCP Repeater
Operation and maintenance manual.
