Troubleshooting
57
300407956_002_C1 - 01/2017 - © Leybold
Error
message
Brief
Description
AL FLT Possible cause
Corrective Action
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or
Base Block
n
The software base block function is
assigned to one of the digital inputs
and the input is off. The frequency con-
verter does not accept Run commands.
Check the digital inputs function selection.
Provide link between SC and S6.
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Control Fault
The torque limit was reached during
deceleration for longer than 3 sec.
when in Open Loop Vector control
• The load inertia is too big.
• The torque limit is too low.
• The motor parameters are wrong.
Check the load.
Set the torque limit to the most appropriate
setting (L7-01 through L7-04).
Check the motor parameters.
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Control
Circuit Fault
n
There is a problem in the frequency
converter’s control circuit.
Cycle the frequency converter power supply.
Initialize the frequency converter.
Replace the frequency converter if the fault
occurs again.
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Control
Circuit Fault
n
There is no terminal board connected
to the control board.
Check if the terminal board is installed proper-
ly.
Uninstall and Reapply the terminal board.
Change the frequency converter.
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Cannot
Reset
n
Fault reset was input when a Run com-
mand was active.
Turn off the Run command and reset the fre-
quency converter.
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Option
External
Fault
n
n
An external fault was tripped by the
upper controller via an option card.
Remove the fault cause, reset the fault and
restart the frequency converter.
Check the upper controller program.
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External
Fault
n
A forward and reverse command were
input simultaneously for longer than 500
ms. This alarm stops a running motor.
Check the sequence and make sure that the
forward and reverse input are not set at the
same time.
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or
External
Faults
n
n
An external fault was triggered by an
external device via one of the digital
inputs S1 to S6.
EF2: Temperatur limiter (casing rotor)
exceeds fault threshold.
EF3: Temperature limiter (motor)
exceeds fault threshold.
The digital inputs are set up incorrectly.
Find out why the device tripped the EF.
Remove the cause and reset the fault.
Check water cooling.
Check motor load, reduce if required, check
water cooling.
Check the functions assigned to the digital
inputs.
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Ground Fault
n
Ground leakage current has exceeded
50% of the frequency converters rated
output current.
Cable or motor insulation is broken.
Excessive stray capacitance at frequen-
cy converter output.
Check the output wiring and the motor for
short circuits or broken insulation. Replace any
broken parts.
Reduce the carrier frequency.
