Watts Lync WQ-RS, Installation, Operation And Maintenance Manual

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Lync WQ-RS
SECTION 3: OPERATION
L- OMM-005_A
•
2/23/2022
Technical Support • (800) 433-5654 • Mon-Fri, 8 am - 5 pm EST
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of 34
MOTOR TROUBLE SHOOTING CHART
TROUBLE CAUSE WHAT TO DO
Motor fails to start Blown fuses Replace fuses with proper type and rating.
Overload trips Check and rest overload in starter.
Improper power supply Check to see that power supplied agrees
with motor nameplate and load factor.
Open circuit in winding or control
switch Indicated by humming sound when switch is
closed.
Mechanical failure Check to see if
motor and drive
turn freely. Check
bearing and
lubrication.
Short circuited stator Indicated by blown fuses. Motor must be
rewound.
Poor stator coil connection Remove end bells, locate with test lamp.
Rotor defective Look for broken bars or end ring.
Motor may be overloaded Reduce load.
Motor Stalls One phase connection Check lines for open phase.
Wrong application Change type or size. Consult manufacturer.
Overload motor Reduce load.
Low motor voltage See that nameplate
voltage is
maintained. Check
connection.
Open circuit Fuses blown, check overload relay, stator
and push buttons.
Motor runs and
then dies down Power failure Check for loose connections to line, to fuses
and to control.
Motor does not
come up to speed Not applied properly Consult supplier for proper type.
Voltage too low at motor terminals
because of line drop.
Use higher voltage on transformer
terminals or reduce load. Check
connections. Check conductors for
proper size.
Broken rotor bars or loose rotor. Look for cracks near the rings. A new
rotor may be required as repairs are
usually temporary.
Motor takes too
long to accelerate Open primary circuit Locate fault with testing device and repair.
Excess loading Reduce load.
Poor circuit Check for high resistance.
Defective squirrel cage rotor Replace with new rotor.
Applied voltage too low Get power company to increase power tap.
Wrong rotation Wrong sequence of phases Reverse connections at motor or at
switchboard.
Motor overheats
while running under
load Overloaded Reduce load.
Frame or bracket vents may be
clogged with dirt and prevent
proper ventilation of motor.
Open vent holes and check for a continuous
stream of air from the motor.