11
Remedy:
Change to R580 vacuum oil if very cold, or warm up oil
before starting the pump.
Possible Cause:
Pump runs in the wrong direction.
Remedy:
Check for correct rotation which is counterclockwise
when looking at the motor from the motor's fan side.
Reverse any two leads on the motor to change the
direction of rotation.
Possible Cause:
Pump is overfilled with oil or wrong kind of oil is used.
Remedy:
Correct the oil level and quality per Section 1.5 and use
recommended motor oil.
Possible Cause:
Exhaust filters in exhaust chamber are clogged and
appear burned black with pump oil.
Remedy:
Replace exhaust filters, maintain proper oil condition,
oil level, and use only Busch recommended vacuum oil
and filters.
Possible Cause:
The exhaust filter is clogged due to process material.
Remedy:
Contact the factory in Virginia Beach, Va. for recom-
mendations or proper filter cartridge.
Possible Cause:
Loose connection in motor terminal box; not all motor
coils are properly connected. Motor operates on two
phases only.
Remedy:
Check motor wiring diagram for proper hookup, espe-
cially on motors with six internal motor windings, tight-
en and/or replace loose connections.
Possible Cause:
Foreign particle in pump; the vanes broken; the bearing
Possible Cause on RC Models Only:
The oil return line (Ref. 290) is connected directly to
atmospheric pressure in the exhaust area. On small
model pumps, a fairly large amount of air is sucked
through the oil return line, and it may not be possible to
reach 15 torr or 29.4 inches Hg. blank-off on the inlet of
the pump under these conditions.
Blank-off of 29.4 inches Hg or 15 torr can be reached by
temporarily disconnecting and closing the oil return line;
also by squirting oil through the exhaust opening into
the exhaust filter area. Oil will be sucked into the oil
return line, and no air will reach the inlet, thus affecting
the "blank-off' pressure.
4.2 Trouble
Pump will not start.
Possible Cause:
The motor does not have proper supply voltage or is
overloaded; motor starter overload settings are too low
or wrong setting; fuses are burned; or wire is too small
or too long, causing a voltage drop to the motor.
Remedy:
Check correct supply voltage; check overload settings
in motor starter for size and setting according to motor
nameplate data; check fuses; and install proper size
wire. If ambient temperature is high, use larger size
overloads or adjust setting 5% above nominal motor
nameplate value.
Possible Cause:
Pump or motor is blocked.
Remedy:
Remove fan cover and try to turn pump and motor by
hand. If frozen, remove motor from pump and check
motor and pump separately. If pump is frozen, disas-
semble completely per the Maintenance and Repair
Manual and remove foreign objects in the pump or
replace broken vanes.
4.3 Trouble
Pump starts, but labors and draws a very
high current.
Possible Cause:
Oil too heavy (viscosity too high) or ambient tempera-
ture below 5 degrees C (41°F).
To Next Page
Loading...
Need help?
General
