Page 30
USE OF VIBRATORS WITH VARIABLE SPEED CONTROLS
Force must be reduced by setting the out of balance weights back. The tables below give the maximum
allowed speed for various percentages of full centrifugal force. Refer to thermistor connection note on page 1
and page 9 for use with variable speed drives.
The vibrator shall be limited to operation in the 25Hz to 80Hz range. 80Hz is the maximum attainable speed
due to winding flux saturation.
Max. Speed/50-60 Hz. Vibrators
Guideline values for maximum speeds are grease limiting speed x 3 for ball bearings & 2.2 for roller
bearings. Grease limiting speeds are given on Page 32.
Consult our Technical Department for further information.
MAINTENANCE
NOTE: Any maintenance carried out to the vibrator must be performed within a safe area.
Inspection and maintenance of this equipment shall be carried out by suitably trained personnel in accordance
with the applicable Code of Practice (EN60079-17 Explosive atmospheres. Electrical installations, inspection
and maintenance.) Repair of this equipment shall be carried out by suitable trained personnel in accordance
with the applicable Code of Practice (EN60079-19 Explosive atmospheres. Equipment repair, overhaul and
reclamation.)
The manufacturer offers a full repair service.
Before carrying out any maintenance on the vibrator ensure that the vibrator is switched off and the
power supply is disconnected. Ensure the external temperature of the vibrator body does not exceed
+50°C before any disassembly is attempted.
Re-Lubrication
BLz 03 to BLz 22 plus BLz 24/25-8/2, -7.5/4 and -4/6 are fitted with shielded ball bearings and are greased
for life.
BLz 24/25 (except above): New motors have grease nipples fitted as standard. Ensure that they are clean
prior to re-lubrication to prevent contamination.
On older motors without grease nipples; remove end covers, circlips and out of balance weights (noting
position of weights to keep the same force output on re-assembly). Remove bearing housing with bearing
outer race. The inner race remains on the rotor shaft. Provided the bearing and grease are in good condition
add new grease by lightly smearing it onto the rollers and re-assemble.
BLz 30 to BLz80 have grease nipples fitted as standard. Ensure that they are clean prior to re-lubrication to
prevent contamination.
Recommended grease is Esso Unirex N3. If an equivalent grease is to be used it must have an auto ignition
temperature of +250ºC or more. If mixing of grease is unavoidable use only Lithium complex alternatives of
consistency 3. Be sure to take full account of any safety precautions specified in the specific grease safety
datasheet before use. Overgreasing causes overheating of the bearings and must be avoided. Grease
cavities should never be filled above one third of their capacity and bearing caps should be removed
occasionally to clean out excess grease. Old grease should periodically be removed and the bearings cleaned
and repacked with new grease.
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