Syncro_View_AUS_v2.0.docx
Page 6 of 12
5
Connecting to the circuit board
All connections for field wiring are to a single row of terminals along the bottom of the circuit board.
Shielded fire alarm cable such as FP200 and metal cable glands must be used for all connections to the unit. The
resistance of any core of the data cable must not exceed 25 ohms. The shield of the cable must be bonded
securely to the enclosure via the metal gland.
Wiring should enter the enclosure at the top or back of the unit using the knockouts provided and be formed
tidily to the appropriate terminals.
Terminals are capable of accepting wires of up to 2.5mm
2
.
Wiring must not go across the front of the circuit board. If cable entries need to be in positions other than at the
knockouts provided, wiring must be fed well away from the surface of the circuit board.
6
Power and data connections
Each unit requires two cores for power and two cores for data transmission to and from the control panel. A four
core cable may be used for these connections. All of these connections are polarity conscious and care should be
taken to match the polarity with the corresponding terminals at the control panel. Mains powered versions require
only a two core cable to the control panel and a local mains supply.
6.1
Data Termination
Up to 15 units can be connected to a Syncro control panel. In and out terminals for data and 24V DC are provided
on each unit.
All units are supplied with a push on jumper fitted at position J3 on the left hand side of the PCB. This jumper
connects a terminating resistor which needs to be in place at the last unit on the data line. If more than one unit
is to be fitted, then the jumpers must be removed from all units except the last one.
If there is only one unit fitted then the jumper should be left in place. The COMMS LED will flash quickly while
the unit is communicating correctly with the control panel and will be off if the unit is disconnected or connected
incorrectly.
6.2
Power Supply
Mains Connection
Select the required operating voltage (115/230) via the selector switch adjacent to the
mains input. The mains is connected to the PSU via a fused terminal block marked with
live, neutral and earth symbols. It is imperative that the equipment is soundly earthed
and this connection should be made and checked first.
Following connection of the live and neutral cables and with no other connections made,
the unit should be powered and the battery output measured at around 28 volts DC (For
nominal 24V setting) or 14 volts DC (for nominal 12V setting.)
Load Connection
A maximum load of 750mA can be drawn with either 24V or 12V settings. (The
recommended maximum continuous load is 500mA.) Terminals are provided for
connection to the load and are and -. The voltage at these terminals under
normal conditions (i.e. off load) should be around 28.5 to 29 volts DC (for nominal 24V
setting) or 14 to 14.5 volts (for nominal 12V setting.) With the mains power off, connect
the load cables.
Double check the load connection for correct polarity before switching on mains. After
switching on mains check the voltage at the load for correct polarity.
Do not connect or disconnect the wiring to the load terminals with mains or battery power
on.
