WDM NE 4 113-4-220, Operation Manual

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24
Operation Manual.
6. Trouble Shooting
Symptoms Possible cause(s) Possible solution(s)
There may not be power to the motor’s
connections.
Check and correct.
Impeller is blocked by solids larger than
the pump can handle.
Measure the current in the motor terminals as
it cannot exceed ± 20%. If amps are blocked
switch off the pump and remove the
obstruction.
If the current in the motor terminals is zero in
single phase, disconnect, let it cool then
reconnect. In 3 phase allow protector to cool,
press, and measure current again.
Even if zero, check installation connections of
the pump, starter, or cables in general.
In 3 phase motors, after placing guards, if the
current is within the limits.
Check the connections to the switch in the pit.
Make sure there is enough water to operate
the controls.
If an ohmmeter is available, place the switch
terminals, use a scale of 100 phmnios, operate
manually and observe if hits zero when closed.
a) Failure of supply phase. a) Check the phase equilibrium.
b) Phase unbalance.
b) Check the setting and replace the overload
relay as necessary.
c) Poor regulation or defective relay and
locked rotor.
c) Send to the service shop.
d) The supply voltage does not match
the engine.
d) Replace the engine or power control.
a) Pump Suction is totally or par-tially
obstructed.
a) Remove the obstruction.
b) The discharge line is clogged. b) Clean the pipe.
c) The discharge valve is closed. c) Open valve.
d) Air is trapped in the body of the
pump.
d) Proceed up and back down the pump or
valve open until all the air.
e) Actual altitude is much higher than
expected.
e) Replace with another model.
1. The pump does not start.
Overload protector is tripped.
2. Pump runs on manual but not
automatically.
Faulty float switch.
3. Pump starts but quickly activates
the overload relay.
4. Pump is running but not draining
the sump.