2.2 Assembling
The MCU Control Units are supplied with the Standby Battery fuse (FS4) not fitted. This fuse
should be fitted once the Control Unit is mounted in position and ready for use. It should be noted
that once this fuse is fitted, power will be connected to all modules and Sensor Heads connected
to the system. All wiring tests and commissioning should therefore be performed prior to fitting
this fuse.
Note: FS4 is supplied in a plastic bag inside the MCU control unit.
It is advisable to familiarise yourself with the Control Unit and its connections before mounting. In
particular observe the mounting positions of any Input modules which have been modified to
comply with an uncommon sensor configuration. It is also a convenient time to set the jumper
switches for all the input modules according to the sensor type to be used.
Note:
Incorrect Input Module configuration can cause damage to the system.
2.3 System Wiring
All connections should be made according to the appropriate sensor or loop diagram for the
configuration required. It is advised that ‘Bootlace Ferrules’ or ‘flat blade crimps’ be used for tidy
and reliable connections of wires into the Control Unit and Detector Head connectors.
2.4 Power Supply Input
An isolating switch should be provided between the power source and the MCU control units to
allow the supply to be easily disconnected. This should incorporate over current protection or a
circuit breaker. Alternatively a fused supply would suffice. For information regarding the current
requirement of the control units, refer to the specification located in section 9.1.
2.4.1 A.C. Mains Connection
All mains voltage connectors etc. have been positioned beneath a yellow protective cover
to prevent inadvertent user contact.
The power supply board has a three pin screw terminal connector assigned for the connection of
an AC supply. This is located to the lower left-hand side of the MCU shrouded by a yellow
protective cover. The AC supply can be either 240V or 110V. The 110V mains supply can be
derived from either a 0V-110V AC power source or a 55V-0-55V AC power source. In all cases
ensure the safety earth (E) is connected.
To connect AC power to the system it is necessary to unplug the three-
terminal connector (PL1) from the power supply PCB. The screw terminals
are connected as shown
Recommendation for mains input cable:
3-Core - Conductors having cross sectional area of 0.75mm
2
minimum (24/0.2).
To Next Page
Loading...