SCM SC 10, Руководство пользователя

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15
9. CAUSES OF IRREGULAR FUNCTION - TROUBLESHOOTERS
1. The submersible
aerator fails to start
2. The overload relay or
internal thermal-
amperometric
protection (single-
phase version only) has
activated during
operation
1.1 The selector switch is set to the
OFF position.
1.2 The motor is not powered.
1.3 The automatic monitoring
devices (level switch, internal
thermal-amperometric protection,
etc.) are not enabling operation.
2.1 All motor phases are not being
fully powered
2.2 Power draw is unbalanced
amongst the phases.
2.3 The motor turns in the wrong
direction.
2.4 Wrong overload relay setting.
2.5 The power supply voltage rating
fails to correspond with that of
the aerator.
2.6 The electric aerator fails to turn
freely since there are points that
rub.
2.7 Aeratored fluid excessively
viscious and/or dense.
2.8 High temperature in the electric
panel.
2.9 Electric motor temperature
excessive.
1.1 Turn to the ON position.
1.2 Check that the electrical
equipment is in a good condition.
Check whether the equipment is
receiving power.
1.3 Wait until the correct operative
conditions have been restored or
check the efficiency of the
automatic devices.
2.1 Check that the electrical
equipment is in a good condition.
Check the power supply voltage
rating.
2.2 Check the unbalance as described
in the “Electrical connections and
information” chapter.
If necessary, send the aerator to
an authorized after-sales service
centre.
2.3 Invert two of the three phases.
2.4 Compare the setting amperage
value with the one on the aerator
data plate.
2.5 Change the aerator or change the
power supply.
2.6 Check the hydraulics according
to the procedure described in the
“Maintenance” paragraph. If
necessary, send the aerator to an
authorized after-sales service
centre.
2.7 Check whether the right aerator
has been chosen.
2.8 Check that the relay is the
compensated ambient
temperature type. Protect the
electric control panel from the
sun and heat.
2.9 Remove the incrustations from
the cooling surfaces of the motor.
Check whether the right aerator
has been chosen since:
- The temperature of the fluid
may be excessive;
- The liquid may be at a
persistently low level and fail to
cover the motor.
Faults Possible causes Remedies