BOC Edwards 212-J, Инструкция по эксплуатации

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J SERIES M ICROV A C J SERIES M ICROV A C
 
V A CU V A CU U M PU M P U M PU M P
PA GE 3 -1
3 .0 3 .0 OPERA TION OPERA TION
3 .1 3 .1 Pre Pre--st art Check st art Check
N OTE: N OTE: 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 tw o revolutions.
3.1.1 A. Jog the motor momentarily w hile observing pump rotation. If the pump
does not rotate in a clockw ise direction, interchange any tw o of the three-
phase leads.
B. M ake sure the oil solenoid valve operates properly by checking the oil flow
indicator. The paddle w heel 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 w hen the
pump starts.
The differential pressure betw een 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% .
N OTE: N OTE: 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.
CA U TION : CA U TION : IF PADDLE WHEEL DOE IF PADDLE WHEEL DOES NOT ROTATE, STOP PUM P IM M 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 jackscrew s. Tighten the jackscrew nuts securely after adjustment.
N OTE: N OTE:
M aintenance of proper belt tension is important. Excessive over M 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 allow s the belts to slip. tightening belts allow s the belts to slip.
3 .2 3 .2 Pum p St art Pum p St art
3.2.1 Turn cooling w ater ON.
ON.
WA RN IN G:
WA RN IN G: REM OVE PLASTIC PLUG FROM EXHAUST PORT BEFORE OPERATING PUM P REM OVE PLASTIC PLUG FROM EXHAUST PORT BEFORE OPERATING PUM P
3.2.2 Depress “
start ” button and check solenoid valve for proper operation.
CA U TION : CA U TION : DO NOT START PUM P WHEN OIL TEM PERATURE IS BELOW 55 DO NOT START PUM P WHEN OIL TEM PERATURE IS BELOW 55 o o F. (13 F. (13 o o C C ) )