32 Hyponic® Operating and Maintenance Manual
Hyponic® Operating and Maintenance Manual 33
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Troubleshooting
The Hyponic® unit is running normally when it meets the following criteria:
1) The motor begins to run immediately after the start switch is moved to the ON position.
2) The unit does not make any abnormal sounds during operation.
3) The motor stops running within about 0.5 seconds after power to the unit is switched off.
Problem Possible Cause Corrective Action
Runs Hot
Overloading
Load exceeds the capacity of the
Hyponic®
Check rated capacity of the Hyponic®; replace
with unit of sufficient capacity or reduce load.
Improper
lubrication
Wrong lubricant
Flush out and refill with correct lubricant as
recommeded.
Vibration or
noise
Loose
Foundation
bolts /
Torque Arm
Weak mounting structure
Inspect mounting of Hyponic®. Tighten loose
bolts and/or reinforce mounting structure.
Loose bolts Tighten bolts.
Failure of
bearings
May be due to lack of lubricant Replace unit.
Overload
Check rated capacity of Hyponic®, replace with
unit of sufficient capacity or reduce load.
Output shaft
does not turn
Motor shaft
broken
Overloading of reducer can cause
damage
Replace broken shaft. Check rated capacity of
Hyponic®.
Key missing or sheared off on
input shaft
Replace key.
Motor
doesn’t turn
Motor
Refer to Motor section of Troubleshooting
Guide.
Load is
disconnected
but motor
doesn’t rotate
Makes a
groaning
sound
Faulty switch contact Replace contact.
Blown fuse Replace.
One phase wire of the power
supply open
Replace.
Stator coil open
Repair by rewinding or replacing stator
assembly.
Stator and rotor touching due to
bearing housing wear
Replace the bearing and bracket.
Table 18. Quick Troubleshooting Guide
Problem Possible Cause Corrective Action
Load is
disconnected
but motor
doesn’t rotate
(cont.)
Starts in either
direction when
turned by hand
Three phase is operating as single-
phase
Check the power source with a
voltmeter.
Doesn’t make
any noise
Stator coil open
Repair by rewinding or replacing stator
assembly.
Outside the
motor
Power failure Contact the power company.
Open connection
wire
Check the source wiring.
Faulty starter
contact
Replace contact.
Rotates with
the load
disconnected,
but:
Rotates in the
wrong direction
Connection error
Change any two of the three-phase
source.
Fuse blows Shorted lead wire Replace.
Speed doesn’t
increase
Faulty starter contact Replace contact.
Groans
Overcurrent
Overheating
Rotor and
stator touching
Repair by winding or replacing stator
assembly.
Overcurrent
One phase
of stator coil
shorted
Replace the stator winding.
Makes a high
pitched metallic
noise
Faulty bearing Replace the bearing.
Rotates
when the
load is dis-
connected
but when
the load is
connected:
Switch
overheats
Insufficient switch capacity
Replace with one having the rated
capacity.
Overload Drop to the rated load.
Fuse blows Insufficient fuse capacity
Replace with one having the rated
capacity.
Overheats
Overload Drop to the rated load.
Voltage drop Consult with the power company.
Speed suddenly
drops
Voltage drop Consult with the power company.
Overload Drop to the rated load.
Stops Bearing damaged by overheat Replace the bearing.
Table 18. Quick Troubleshooting Guide (cont.)
HYPONIC®MOTOR
MOTOR (cont.)
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