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A universal instrument (VOM), a test lamp (continuity
tester) and a wiring diagram are required in order to
carry out fault tracing on the electrical equipment.
Fault tracing should be done with the power supply
disconnected and locked off, except for those checks
which cannot be performed without voltage.
Fault Tracing (Troubleshooting)
Is an alarm signal indicated
on the control panel?
No
Can the machine be started
manually?
No
Is the installation receiving voltage?
Yes
Is the propeller stuck?
WARNING: Disconnect power
before checking the propeller.
No
Ex-approved machine!
All work on the explosion-proof
motor section must be performed by
personnel authorized by Flygt.
1. The machine fails to start
Yes
Check the cause:
— If the stator temperature is high, check that the propeller
rotates easily.
— If there is a fault in the thermal switches, contact a Flygt
service shop.
Check that the overload protection is reset.
Yes
Fault in control equipment.
Check:
— that all connections are intact.
— relay and contactor coils.
— that the control switch “Man/Auto” makes contact in both
positions.
No
Check:
— that the main power switch is on.
— that there is control voltage to the starter equipment and that
its fuses are intact.
— that there is voltage in each phase of the supply line.
— that all fuses have continuity and are tight.
— that the overload protection is reset.
— that there is no break in the motor cable.
Yes
Clean
Contact Flygt service shop.
Always make sure that there is no one near the
machine when the power supply is turned on.
Use the following checklist as an aid to fault tracing. It
is assumed that the mixer and installation have for-
merly functioned satisfactorily.
Electrical work must be performed by an authorized
electrician.
Follow local safety regulations and observe recom-
mended safety precautions.
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