S149-01-880 Issue F
Page 6 © Edwards Limited 2011. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
1.3.3 Electrical system
The main power supply is 400 VAC/3 Ph/ 50 Hz and should be wired through a suitable fused motor starter. Power
for the oil solenoid is taken from any two motor leads. Check both motor and solenoid nameplates to insure proper
voltage (Refer to Section 3.7 for information).
1.3.4 Lubricants
Refer to Section 2 for recommended pump fluids.
1.3.5 Guards
The motor pulley, pump pulley, belts and flywheel are enclosed by guards to prevent accidental contact with these
parts. The pump should never be operated with guards removed.
1.3.6 Vacuum access ports
When connecting a gauge to one of the ports, it is necessary to provide a 90° elbow and a minimum of 305 mm
(12 inches) of vertical pipe to the gauge sensor to reduce the chance of contaminating the gauge with pump
lubricants.
The pump is provided with 1/4 inch and 1/2 inch NPT vacuum access ports. These ports are provided for customer
convenience. The ports can be used for gauges to monitor the pump performance or access for introducing purge
gases to the pump.
1.3.7 Oil temperature sensor/heater access ports (412-J pump only)
Oil temperature sensor/heater ports have been added to the 412-J pump to provide a means to monitor and heat the
pump oil. The sensor monitors the oil temperature in the pump and can be used as an indicator for service. The heater
can be used to heat the oil if it is below minimum starting temperature to reduce the amount of condensables in the
oil (Refer to Figure 4 Items 13 and 14).
1.3.8 Oil drain port (412-J pump only)
A 1/4 inch oil drain access port has been added to provide a means of removing oil that pools above the valve decks
(Refer to Figure 4 Item 7).
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