Installation
Newall Measurement Systems
5
INSTALLATION
BEFORE CONNECTING THE ELECTRICAL SUPPLY TO THE DIGITAL SENDING UNIT (DSU), CHECK
THAT THE VOLTAGE SELECTOR SWITCH IS CORRECTLY SET. Figure 2.3 shows the position of this
switch.
The mains supply is connected through a detachable supply cord. The counter is supplied with a cord with a
right-angle connector. If another supply cord is used, it must have fitted a IEC320, 10A, EARTHED mains
connector with a cord rated for at least 10A.
The PROTECTIVE EARTH CIRCUIT of the mains supply MUST BE CONNECTED to the protective earth
terminal of the DSU through the supply cord.
The supply cord should be secured with cable ties to ensure that it cannot drop into a hazardous position,
ie. the floor or coolant tray, when disconnected from the DSU.
The supply cord must be routed away from moving parts, swarf, coolant or sources of heat.
If a mains plug is not already fitted to the supply cord or is of the wrong type, then a suitable EARTHED plug
should be used which complies with the relevant specifications for plugs and socket-outlets.
The mains supply fuse is a 20x5mm, type T0.5A, 250V. It is not to be replaced by the operator. If the fuse
blows it is a possible indication of some significant problem with the power source. Check the supply and
wiring carefully. If the fuse is replaced, the DSU must first be disconnected from the supply by the removal
of the IEC socket from the inlet. This connector is the primary disconnect device for the equipment and must
be accessible at all times. Do not position the equipment so that it is difficult to operate the disconnect
device.
NOTE: If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
Figure 2.3 - Connection diagram for the Digital Sending Unit (DSU)
2.2 Power Supply
Equipotential terminal for grounding the DSU to the machine. Refer to section 2.1.
Caution. Refer to section 2.2 before connection to the mains supply.
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General