Seko MSA Serie Manual De Instalación página 17

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Low voltage
The voltage is too
low or with heavy
load; the pump stops
operation or bad
lubrication
The motor suffers
from bad ventilation
or insolation
The voltage is too
high or the wire
The motor
connection is wrong
temperature
is too high
and is smo
king
The motor is started
frequently or its
rotation direction is
changed very often
Mutual friction
between stator and
rotor
Start under single
phase power supply
The fuse is
burn or
There is short circuit
tripped
between switch and
motor
The stator winding is
not earthed or there
is short circuit on the
SPR0136037
1.The power supply cable is too thin to burden huge
starting pressure, change into thick cable
2.The motor that should be connected by triangle
connection is wrongly connected by star connection, and
the motor is started with heavy-duty
1. Measure if the voltage is too low
2. Measure if the current is too big, if exceeding the
rated current, it might be overloaded, so it can
reduce the load
3. Solve the mechanical problem and fill lubrication oil
1. Check if the fan leaf is damaged or fixed
2. Check if the fan cover is jammed by dust
3. Remove articles affecting ventilation and heat
dissipation
4. Provide necessary shield for motor
1. If the voltage is too high, consider providing stable
power supply
2. The motor that should be done by triangle connection is
wrongly connected by star connection, so the phase
voltage is reduced and light load can be burdened, but for
heavy load, the motor heats and might be burned even.
3. The motor that should be done by star connection is
wrongly connected by triangle connection, so the phase
voltage is increased and immediately stop motor
operation, otherwise, the motor might be burned.
Reduce times of rotation direction change and start-up
1. The screw of motor cover is loose, forming gap
between cover and housing, the solution is to tighten the
screw
2. The rotor bearing block is too small or the bearing
chamber of motor cover is too big
Check switch and fuse
Check if there is short circuit between motor terminal and
if there is short circuit on the connecting wire between
motor and power supply
The motor should be earthed and insulate the short circuit
Rev. 1.5
12

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