Fuji Electric FRENIC-AQUA series, User Manual

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9-24
Possible Causes What to Check and Suggested Measures
(7) The reference frequency was
below the starting or stop
frequency.
Check that a reference frequency has been entered correctly, using Menu
"I/O Checking" on the keypad.
Î Set the reference frequency at the same or higher than that of the
starting and stop frequencies (F23 and F25).
Î Reconsider the starting and stop frequencies (F23 and F25), and if
necessary, change them to the lower values.
Î Inspect the external frequency command potentiometers, signal
converters, switches, and relay contacts. Replace any ones that are
faulty.
Î Connect the external circuit wires to terminals [13], [12], [11], [C1],
and [V2] correctly.
(8) A frequency command with
higher priority than the one
attempted was active.
Check the higher priority run command with Menu "Data Checking" and
Menu "I/O Checking" using the keypad, referring to the block diagram of
the frequency command block (refer to Chapter 7).
Î
Correct any incorrect function code data (e.g. cancel the higher
priority run command).
(9) The upper and lower
frequencies for the frequency
limiters were set incorrectly.
Check the data of function codes F15 (Frequency limiter (High)) and F16
(Frequency limiter (Low)).
Î Change the settings of F15 and F16 to the correct ones.
(10) The coast-to-stop command
was effective.
Check the data of function codes E01 through E07, E98, and E99 and the
input signal status, using Menu "I/O Checking" on the keypad.
Î Release the coast-to-stop command setting.
(11) Broken wires, incorrect
connection or poor contact
with the motor.
Check the wiring (Measure the output current).
Î Repair the wires to the motor, or replace them.
Measure the output current.
Î Reduce the load (In winter, the load tends to increase.)
(12) Overload
Check whether any mechanical brake is activated.
Î Release the mechanical brake, if any.
Check that the motor starts running if the value of torque boost (F09) is
increased.
Î Increase the value of torque boost (F09) and try to run the motor.
Check the data of function codes F04, F05, H50, H51, H52 and H53.
Î Change the V/f pattern to match the motor's characteristics.
Check that the motor switching signal (motor selection) is correct and the
data of function codes matches each motor.
Î Correct the motor switching signal.
Î Modify the function code data to match the connected motor.
(13) Torque generated by the motor
was insufficient.
Check whether the reference frequency is below the slip-compensated
frequency of the motor.
Î Change the reference frequency so that it becomes higher than the
slip-compensated frequency of the motor.