18
5.5.4 V-BELT TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSES
SOLUTION
Belts slip (sidewalls glazed)
Not enough tension
Replace belts; apply proper tension
Drive squeals
Shock load
Apply proper tension
Not enough arc of contact
Increase center distance
Heavy starting load
Increase belt tension
Belt(s) turned over
Broken cord caused by prying on sheave
Replace set of belts and install correctly
Overloaded drive
Redesign drive
Impulse loads
Apply proper tension
Misalignment of sheave and shaft
Realign drive
Worn sheave grooves
Replace sheaves
Excessive belt vibration
Check drive design
Check equipment for solid mounting
Consider use of banded belts
Mismatched belts
New belts installed with old belts
Replace belts in matched sets only
Breakage of belt(s)
Shock loads
Apply proper tension; recheck drive
Heavy starting loads
Apply proper tension; recheck drive
Use compensator starting
Belt pried over sheaves
Replace set of belts correctly
Foreign objects in drives
Provide drive guard
Rapid belt wear
Sheave grooves worn
Replace sheaves
Sheave diameter too small
Redesign drive
Mismatched belts
Replace with matched belts
Drive overloaded
Redesign drive
Belt slips
Increase tension
Sheaves misaligned
Align sheaves
Oil or heat condition
Eliminate oil. Ventilate drive.
5.6 MOTOR AND ELECTRICAL CONNECTIONS
WARNING
The motor and connections shall be protected to assure that product and
environmental condensation does not come in contact with the electrical
connections.
NOTE
It is the responsibility of the installer to assure that the motor is in compliance
with the latest edition of IEC 60204-1 and all electrical connections
performed per IEC 60204-1, this includes over current protection.
Wire the motor and other electrical devices such as solenoid valves and temperature switch to the proper
voltage and amperage as indicated on the nameplate of each component being wired. Turn the blower by
hand after wiring is completed to determine that there are no obstructions and if the blower turns freely;
then momentarily start the blower to check the direction of rotation. Figure 2 shows direction of air fl ow in
relation to rotor rotation. The air fl ow direction can be reversed by reversing the appropriate motor leads.
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