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6-3
Possible Causes
What to Check and Suggested Measures
(7) A frequency command
with higher priority than
the one attempted was
active.
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 drive command block*.
*Refer to the FRENIC-Multi User's Manual, Chapter 4.
Î
Correct any incorrect function code data settings (e.g. cancel the
higher priority run command).
(8) 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.
(9) The coast-to-stop
command was effective.
Check the data of function codes E01, E02, E03, E04, E05, E98 and
E99 and the input signal status with Menu #4 "I/O Checking" using
the keypad.
Î
Release the coast-to-stop command setting.
(10) Broken wire, incorrect
connection or poor
contact with the motor.
Check the cabling and wiring (Measure the output current).
Î
Repair the wires to the motor, or replace them.
Measure the output current.
Î
Lighten the load (In winter, the load tends to increase.)
(11) Overload
Check that a mechanical brake is in effect.
Î
Release the mechanical brake, if any.
Check that the motor starts running if the value of torque boost (F09
and A05) is increased.
Î
Increase the value of torque boost (F09 and A05) and try to run
the motor.
Check the data of function codes F04, F05, H50 through H53, A02,
and A03.
Î
Change the V/f pattern to match the motor's characteristics.
Check that the motor switching signal (selecting the motor 2 or 1) is
correct and the data of function codes matches each motor.
Î
Correct the motor switching signal.
Î
Modify function codes to match the connected motor.
(12) Torque generated by
the motor was
insufficient.
Check whether the frequency command signal is below the
slip-compensated frequency of the motor.
Î
Change the frequency command signal so that it becomes higher
than the slip-compensated frequency of the motor.
(13) Miss-/poor-connection
of the DC reactor
(DCR)
Check the wiring.
Î
Connect the DC reactor correctly. Repair or replace wires for the
DC reactor.