S149-01-880 Issue F
Page 18 © Edwards Limited 2011. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
Figure 10 - Exhaust piping
3.7 Electrical connections
Ensure proper voltage, starters and overloads are supplied to the motor, and proper voltage supplied to the
solenoid coil. The pump and/or solenoid may fail to operate if voltage is less than 90 % of rated.
The pump electrical schematic is shown in Figure 11.
Install a motor starter with safety device within easy reach of the operator.
Connect the solenoid valve(s).
Connect the motor so that the pump shaft rotates clockwise when viewed from the drive end. See Section 4.1 for
pre-start check procedures.
Install electrical cables while ensuring not to create a trip hazard that could result in injury to
personnel.
Installation of the electrical connections should be performed by a competent technician familiar
with vacuum systems, pumps and controls. The system should be wired as to not create a hazard
due to power loss or re-initializing the pump after a power loss. If a power loss occurs, the system
should have a manual reset for controls before restart.
1. Microvac pump
2. Vent pipe
3. Drain cock
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