Edwards 900-607-MH05

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Installation
S900-01-880 Issue C
3.10 Electrical connections
3.10.1 Electrical supply configuration
CAUTION
Configure the electrical supply to the booster pump so that the pump is automatically switched off if the backing
pump stops. If you do not, the booster pump may overheat and be damaged.
Note: Connect the electrical supply to the motor through a contactor which has a manual reset control.
A suitably trained technician must correctly install the necessary overloads, motor starter, and control and safety
devices, and connect the electrical supply to the booster pump. Control devices may include temperature switches
and pressure switches. If the necessary control and safety devices are not installed, this may invalidate any Edwards
warranty, and can result in serious injury or death, and damage to the equipment.
Incorporate a manual restart, to prevent automatic cycling in the event of an overload. The booster pump control
system must be configured so that a hazardous condition does not arise after electrical supply failure, or when the
electrical supply is restored after a failure. Controls should be clearly visible and easily accessible, and be organised
to help the operator to understand their functions and their effect on the booster pump and vacuum system.
All electrical connections and controls must meet local and national regulations and standards. You must incorporate
over-current protection and a mains electrical disconnect. Ensure that all electrical wiring is protected from dripping
water and has appropriate strain relief. Where necessary, incorporate additional controls to protect the equipment
and people if the performance limits of the booster pump may be exceeded.
Where necessary, depending on booster pump size, backing pump capacity and chamber size, incorporate other
devices such as interstage temperature switches, timers or vacuum pressure switches, to protect the booster pump
from thermal and mechanical overload.
Because of the wide range of applications for the booster pumps and the various vacuum systems and configurations,
specific sizes or models of the protective equipment, safety devices and control devices cannot be specified in this
manual. Information used in the selection of these devices can be found in Section 2. Contact Edwards for
recommendations on the protection and safety devices necessary for your specific application.
WARNING
The electrical installation must conform to all local and national safety regulations. Use a suitably
rated fused and protected electrical supply and an earth (ground) point.
WARNING
Install electrical cables so that they do not present a trip hazard that could result in injury to
people.
WARNING
Provide suitable strain relief on the electrical supply cable. If you do not, the cable (or wires in
the cable) may become disconnected from the pump, and there may be a risk of injury or death
by electrical shock.
WARNING
You must be able to isolate and lock-out the electrical supply from the booster pump. If you do
not, there will be a risk of injury or death by electrical shock during maintenance or servicing.