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Section 3 Troubleshooting
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
Output phase
failure
protection
This function stops the inverter output if one of the
three phases (U, V, W) on the inverter's output side
(load side) results in open phase.
• Check the wiring
(Check the motor for a
fault.)
• Check that the capacity
of the used motor is not
smaller than the inverter
capacity.
• Wire the cables
properly.
• Check the setting of
Pr. 251 "output phase
failure protection
selection".
Fan fault For the inverter which contains a cooling fan, FN
appears on the operation panel when the cooling fan
stops due to a fault or operates differently from the
setting of Pr. 244 "cooling fan operation selection".
Check the cooling fan for
a fault.
Change the fan.
Stall prevention
(overcurrent)
During acceleration—If a current of more than
150% of the rated inverter current flows in the motor,
this function stops the increase in frequency until the
overload current reduces to prevent the inverter from
resulting in overcurrent shut-off. When the overload
current has reduced below 150%, this function
increases the frequency again.
During constant-speed operation—If a current of
more than 150% of the rated inverter current flows in
the motor, this function lowers the frequency until the
overload current reduces to prevent overcurrent
shut-off. When the ~ overload current has reduced
below 150%, this function increases the frequency up
to the set value.
During deceleration—If a current of more than
150% of the rated inverter current flows in the motor,
this function stops the decrease in frequency until the
overload current reduces to prevent the inverter from
resulting in overcurrent shut-off. When the overload
current has reduced below 150%, this function
decreases the frequency again.
Check the motor for use
under overload.
The acceleration/
deceleration time may
change. Increase the
stall prevention
operation level with Pr.
22 "stall prevention
operation level", or
disable stall prevention
with Pr. 156 "stall
prevention operation
selection".
Note: The stall
prevention operation
current can be set as
desired. It is
factory-set to 150%.
Stall prevention
(overvoltage)
During deceleration—If the regenerative energy of
the motor increases too much to exceed the brake
capability, this function stops the decrease in
frequency to prevent overvoltage shutoff. As soon as
the regenerative energy has reduced, deceleration
resumes.
• Check for sudden speed
reduction.
• The deceleration time
may change. Increase
the deceleration time
using Pr. 8
"deceleration time"
PU stop A stop made by pressing the key of the PU has
been set in Pr. 75 "PU stop
selection".
• Check for a stop made
by pressing the
key of the operation
panel during external
operation.
• Perform opeartion
correctly.
This alarm appears if:
• The RES signal is on;
• You attempted to set any parameter value in the
external operation mode;
• You attempted to change the operation mode during
operation;
• You attempted to set any parameter value outside its
setting range.
• You attempted to set any parameter value during
operation (while signal STF or STR is ON).
• You attempted to set any parameter value while
parameter write is being inhibited in Pr. 77
"parameter write inhibit selection".
• Perform operation
correctly.
No Motor Operation With AC Drive Fault
(continued)
Operation
Panel
Indication Name Description and NOTES Check point Corrective action
STOP
RESET
STOP
RESET