Fuji Electric Frenic Mega Series User Manual page 604

Possible Causes
(6) No analog frequency
command input.
(7) The reference frequency
was below the starting or
stop frequency.
(8) A frequency command with
higher priority than the one
attempted was active.
(9) The upper and lower
frequencies for the
frequency limiters were set
incorrectly.
(10) The coast-to-stop command
was effective.
(11) Broken wires, incorrect
connection or poor contact
with the motor.
(12) Overload
(13) Torque generated by the
motor was insufficient.
What to Check and Suggested Measures
Check whether the analog frequency command (reference frequency) is
correctly inputted, using Menu #4 "I/O Checking" on the keypad.
Connect the external circuit wires to terminals [13], [12], [11], [C1], and
[V2] correctly.
When terminal [C1] is used, check the slider position of terminal [C1]
property switch (SW5) and the setting of the thermistor mode selection
(H26).
Check that a reference frequency has been entered correctly, using Menu #4 "I/O
Checking" on the keypad.
Set the reference frequency at the same or higher than that of the starting
and stop frequencies (F23* and F25).
Reconsider the starting and stop frequencies (F23* and F25), and if
necessary, change them to the lower values.
Inspect the external frequency command potentiometers, signal converters,
switches, and relay contacts. Replace any ones that are faulty.
Connect the external circuit wires to terminals [13], [12], [11], [C1], and
[V2] correctly.
Check the higher priority run command with Menu #2 "Data Checking" and
Menu #4 "I/O Checking" using the keypad, referring to the block diagram of the
frequency command block (refer to Chapter 6).
Correct any incorrect function code data (e.g. cancel the higher priority run
command).
Check the data of function codes F15 (Frequency limiter (High)) and F16
(Frequency limiter (Low)).
Change the settings of F15 and F16 to the correct ones.
Check the data of function codes E01 through E07, E98, and E99 and the input
signal status, using Menu #4 "I/O Checking" on the keypad.
Release the coast-to-stop command setting.
Check the wiring (Measure the output current).
Repair the wires to the motor, or replace them.
Measure the output current.
Reduce the load (In winter, the load tends to increase.)
Check whether any mechanical brake is activated.
Release the mechanical brake, if any.
Check that the motor starts running if the value of torque boost (F09*) is
increased.
Increase the value of torque boost (F09*) and try to run the motor.
Check the data of function codes F04*, F05*, H50, H51, H52, H53, H65, and
H66.
Change the V/f pattern to match the motor's characteristics.
Check that the motor switching signal (selecting motor 1, 2, 3 or 4) is correct and
the data of function codes matches each motor.
Correct the motor switching signal.
Modify the function code data to match the connected motor.
Check whether the reference frequency is below the slip-compensated
frequency of the motor.
Change the reference frequency so that it becomes higher than the
slip-compensated frequency of the motor.
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