MK Plastics Axijet IO&M - Manual (Page 10)

Start Up
Turn the fan on. In variable speed units, set the fan to its lowest speed and inspect for the following:
1. Direction of rotation.
2. Excessive
vibration.
3. Unusual noise.
4. Bearing noise.
5. Improper belt alignment or tension (listen for squealing).
6. Improper motor amperage or voltage.
If a problem is discovered, immediately shut the fan off. Shut off all electrical power and check for the
cause of the trouble. See Troubleshooting.
Inspection
Inspection of the fan should be conducted in the first 30 minutes, 8 hour and 24 hour intervals of satisfactory op-
eration. During the inspections, stop the fan and inspect as per the Conditions Chart.
30 Minute Interval
Inspect bolts, setscrews, and motor mounting bolts. Adjust and tighten as necessary.
8 Hour Interval
Inspect belt alignment and tension. Adjust and tighten as necessary.
24 Hour Interval
Inspect belt tension, bolts, setscrews, and motor mounting bolts. Adjust and tighten as necessary.
Maintenance
Establish a schedule for inspecting all parts of the fan. The frequency of inspection depends on the operating condi-
tions and location of the fan.
Inspect fans exhausting corrosive or contaminated air within the first month of operation. Fans exhausting contami-
nated air (airborne particles) should be inspected every three months or sooner. Regular inspections are also rec-
ommended for fans exhausting non-contaminated air.
It is recommended the following inspection be conducted twice per year.
•
Inspect bolts and setscrews for tightness. Tighten as necessary. Worn setscrews should be replaced im-
mediately.
•
Inspect belt wear and alignment. Replace worn belts with new belts and adjust alignment as needed. See
Belt and Pulley Installation on page. 7.
•
Inspect springs and rubber isolators for deterioration and replace as needed.
• Inspect for cleanliness. Clean exterior surfaces only. Removing dust and grease on motor housing as-
sures proper motor cooling. Removing dirt from the wheel and housing prevents imbalance and damage.
Motor Bearings
Motor bearings are pre-lubricated and sealed. Under normal conditions they will not require further maintenance for
a period of 10 years. However, it is advisable to have your maintenance department remove and disassemble the
motor, and lubricate the bearings after 3 years of operation in excessive heat and/or in a contaminated air stream
consisting of airborne particles.
Motor Service
Should the motor prove defective within one-year period, contact MK Plastics directly, or your nearest motor service
representative.
Changing Shaft Speed
All belt driven fans with motors up to and including 5 hp (184T max.) are equipped with variable pitch driver pulleys.
To change the fan speed, perform the following:
1. Loosen setscrews on driver (motor) pulley and remove key, if equipped.
2. Turn the pulley rim to open or close the groove facing. If the pulley has multiple grooves, all must be ad-
justed to the same width.
3. After adjustment, inspect for proper belt tension and alignment.
Speed Reduction
Open the pulley in order that the belt rides deeper in the groove (smaller pitch diameter).
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