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Installation
D396-14-880 Issue J
3.4 Connect the electrical supply
Note: If you will use an EXC300 or EXC300M Controller in a commercial or residential environment, you must fit
the in-line filter supplied to the electrical supply connector on the Controller, then fit the connector on
the electrical supply cable to the filter.
1. Connect the wires at one end of the electrical supply cable to a suitably rated and fused electrical supply; if
required, connect the wires to a suitably rated plug. Connect the wires as follows:
z Connect the green/yellow wire to earth (ground).
z Connect the brown wire to the live electrical supply.
z Connect the blue wire to the neutral electrical supply.
2. On EXC120, EXC300 and EXC300M Controllers, ensure the electrical supply isolator on the rear panel is in the off
position.
3. Fit the connector on the other end of the electrical supply cable to the electrical supply connector on the rear
of the Controller (see Figures 3 to 5).
3.5 Connect additional earth (ground) bonding (if required)
Protective earthing (grounding) for electrical safety of the EXC Controller, EXT pump and accessories is provided by
the electrical supply cables and connectors and the pump-to-controller cable. However, additional earth (ground)
bonding may be required to improve the reliability of the system by reducing any effects of RFI (radio frequency
interference), particularly if the vacuum system is prone to high voltage discharges or other radio frequency
emissions.
Use good EMC (electromagnetic compatibility) practices and take note of the following EMC earthing (grounding)
guidelines to reduce the susceptibility of the system to RFI:
z Connect the Controller, the EXT pump and the vacuum chamber to a common earth (ground) point on the
pumping system; this star earth (ground) is typically in the electrical power distribution box.
z Clamp the Controller earthing (grounding) terminal between the two lock-nuts provided on the earth
(ground) stud on the rear panel of the Controller.
z Use suitable heavy duty cable or braid to ensure a low impedance bond to the earth (ground) point (typically
less than 0.1 Ω for each leg of the star).
z Use screened cable for all wiring to the logic interface connector. (The TAV5 vent-valve and the ACX Air
Cooler accessories are provided with screened cable.) Connect each screen to the Controller earth (ground)
stud to ensure that they are properly earthed (grounded).
3.6 Connect the EXT pump
Use a pump-to-controller cable (not supplied) to connect the Controller to the EXT pump. Fit the connectors on the
ends of the cable to the appropriate mating-halves on the Controller and on the EXT pump. The connectors are
polarised so you cannot fit a connector in the wrong orientation and different connector types are used on the
Controller and on the EXT pump, so you cannot fit the cables the wrong way round.
High voltages exist in the Controller when it is operating. Ensure that the Controller is earthed
(grounded) and observe all appropriate safety precautions for the safe installation and handling of
electrical equipment. If you do not, there will be a danger of injury or death to people by electric
shock.
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