A540-55-880 Issue D
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Installation
3.8 Connect an additional RF earth (ground) (optional)
If the system will be operated in an area subject to high RF (radio frequency) emissions, in accordance with good RF
installation practice, Edwards recommends:
Using a star washer to connect the end of the earth (ground) cable (Figure 3, item 6), connected to the
system inlet, to one of the bolts used to secure the inlet flange.
Connecting an additional earth (ground) cable to the RF earth (ground) stud (M6) (Figure 4, item 20). Use a
suitable low-impedance cable (for example, use braided cable).
Figure 15 - RF Earth connection
3.9 Connect to the emergency stop circuit
The EMS (Emergency Stop) button on the front panel of the system (Figure 2, item 1) is used to stop the pump in an
emergency.
Note: Used on its own, the EMS does not isolate the electrical supply to the pumping system and so does not
provide an EMO (Emergency Off) function. This function can be provided by using an Edwards Disconnect
Box available as an accessory, see Section 7.3.
The pumping system has an emergency stop circuit that can be connected to the customer control equipment. (In
this case, the emergency stop control should be compliant with IEC 60947-5-1, a red self-latching mushroom push
button on a yellow background).
If operating the pumping system without connecting it to the customer control equipment, fit the external EMS link
plug (supplied) to the EMS connection on the rear of the system (Figure 4, item 10). If the EMS link plug is not fitted,
the system will not operate.
3.9.1 Semi S2 requirements
If EMO functionality is required (for example, to satisfy the requirements of Semi S2), install the pumping system in
combination with an Edwards Disconnect Box (available as an accessory, refer to Section 7.3). The Disconnect Box,
when fitted, is used to energise and isolate the power supply to the system. It also allows isolation of the electrical
supply for maintenance and trouble shooting the system. Refer to the Disconnect Box manual for installation
instructions and information about the different ways the pumping system can be shut down in an emergency.
For pumps that are installed into an integrated system and receive power from that system, an emergency off can
be achieved by connecting the emergency stop circuit on the pump into the integrated system's emergency off
circuit.
Refer to Section 4.6 for more information about pump behaviour after an emergency stop.
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