BOC Edwards 412-J - Microvac Pump Operation; Pre-start Check Procedures; Pump Start-Up Sequence

To Next Page

To Previous Page

J SERIES M ICROV A CJ SERIES M ICROV A C VA CU V A CUUM PU M P UM PU M P

PA GE 3-1

3.03.0 OPERATIONOPERA TION

3.13.1 PrePre--st art Checkstart Check

NOTE:NOTE: Remove belt guard cover. Turn pump over by hand at least tw o revolutions.Remove belt guard cover. Turn pump over by hand at least two revolutions.

3.1.1 A. Jog the motor momentarily while observing pump rotation. If the pump

does not rotate in a clockwise direction, interchange any two of the three-

phase leads.

B. Make sure the oil solenoid valve operates properly by checking the oil flow

indicator. The paddle wheel should rotate after system pressure is below

600 mm Hg. (6" Hg. Suction).

C. The oil solenoid valve is normally closed, and must be energized when the

pump starts.

The differential pressure between the oil reservoir (atmospheric pressure)

and the pump cavity (vacuum) forces the oil to the bearings and into the

pump cavity. The oil lubricates the moving parts and also creates an oil

seal.

Oil starts to flow at 600 Torr. At 400 Torr the flow is approximately 50%.

From 100% Torr to blank-off (15u), flow is 100%.

NOTE:NOTE: You must reach 400 torr in 10 minutes or a force feed lubrication system is required to You must reach 400 torr in 10 minutes or a force feed lubrication system is required to

provide adequate oil flow to the pump cavity.provide adequate oil flow to the pump cavity.

CAU TION:CAU TION: IF PADDLE WHEEL DOEIF PADDLE WHEEL DOES NOT ROTATE, STOP PUMP IMM EDIATELY. (1) CHECK S NOT ROTATE, STOP PUM P IM M EDIATELY. (1) CHECK

OPERATION OF SOLENOID. (2) CHECK OIL LINES FOR BLOCKAGE.OPERATION OF SOLENOID. (2) CHECK OIL LINES FOR BLOCKAGE.

3.1.2 DRIVE BELT TENSION

A. At approximately the center of the span, betw een drive and driven pulleys,

apply 3 to 5 pounds (13.3 - 22.2 N) force for the 212-J and 5 to 7 pounds (22.2 -

31.2 N) force for the 412-J, on the belt. If tension is correct, the resulting deflection

should be 7/16" (11 M M ) for the 212-J and 1/2" (13 M M ) for the 412-J.

B. Adjust, if necessary, by raising or low ering the nuts on the motor

support jackscrews. Tighten the jackscrew nuts securely after adjustment.

NOTE:NOTE: M aintenance of proper belt tension is important. Excessive overM aintenance of proper belt tension is important. Excessive over--tightening belts is tightening belts is

harmful to the shaft bearings. harmful to the shaft bearings. Under Under--tightening belts allows the belts to slip.tightening belts allows the belts to slip.