Anemostat EST - Manual (Page 28)

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Table 7 – Troubleshooting Guide
Problem
Motor does not Start
Motor Stalls
Motor does not reach full
speed
Motor takes too long to
accelerate
Motor vibrates or is
excessively noisy
Motor overheats while
running under load
Cause
Blown Fuse
Low voltage
Improper line connections
Defective Motor
Defective Capacitor
Defective Speed Controller
Motor overloaded
Low Motor Voltage
Voltage too low
Starting load too high
Excess loading or high inertia load
Applied voltage too low
Defective motor
Motor misaligned
Voltage too high
Worn, damaged, dirty or overloaded
bearings
Overloaded motor
Dirt clogging motor ventilation
Faulty connections
High or low voltage
Defective Motor
Action
Replace Fuse - Recheck
Check/repair inadequate wiring or line
power feed
Check against diagram and repair
Repair or replace
Replace
Replace
Check for proper primary airflow, motor
speed and HP setting
Check for proper line voltage
Increase speed controller setting. Move to
higher HP tap. Check for poor connections
Check primary airflow
Check primary airflow, motor speed or HP
tap setting. Clean blower wheel
Check for poor connections
Increase conductor size
Repair or replace
Realign
Check wiring; correct voltage
Replace or repair motor;
Check alignment and balance
Check primary airflow
Clean motor / blower
Clean tighten or repair wiring
Check for +/-10% rated voltage
Repair or Replace