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6-2
6.2 If No Alarm Code Appears on the LED Monitor
6.2.1 Abnormal
motor
operation
[ 1 ] The motor does not rotate.
Possible Causes
What to Check and Suggested Measures
(1) No power supplied to
the inverter.
Check the input voltage, output voltage and interphase voltage
unbalance.
Î
Turn ON a molded case circuit breaker (MCCB), a
residual-current-operated protective device (RCD)/earth leakage
circuit breaker (ELCB) (with overcurrent protection) or a
magnetic contactor (MC).
Î
Check for voltage drop, phase loss, poor connections, or poor
contacts, and fix them if necessary.
(2) No run forward/reverse
command was inputted,
or both the commands
were inputted
simultaneously (external
signal operation).
Check the input status of the forward/reverse command with Menu
#4 "I/O Checking" using the keypad.
Î
Input a run command.
Î
Set either the forward or reverse operation command to off if both
commands are being inputted.
Î
Correct the assignment of commands
FWD
and
REV
to function
codes E98 and E99.
Î
Connect the external circuit wires to control circuit terminals
[FWD] and [REV] correctly.
Î
Make sure that the sink/source jumper switch on the printed
circuit board (PCB) is properly configured.
(3) No indication of rotation
direction (keypad
operation).
Check the input status of the forward/reverse rotation direction
command with Menu #4 "I/O Checking" using the keypad.
Î
Input the rotation direction (F02 = 0), or select the keypad
operation with which the rotation direction is fixed (F02 = 2 or 3).
(4) The inverter could not
accept any run
commands from the
keypad since it was in
Programming mode.
Check which operation mode the inverter is in, using the keypad.
Î
Shift the operation mode to Running mode and enter a run
command.
(5) A run command with
higher priority than the
one attempted was
active, and the run
command was stopped.
Refer to the block diagram of the drive command generator* and
check the higher priority run command with Menu #2 "Data
Checking" and Menu #4 "I/O Checking" using the keypad.
*Refer to the FRENIC-Mini User's Manual, Chapter 4.
Î
Correct any incorrect function code data settings (H30) or cancel
the higher priority run command.
(6) The reference frequency
was below the starting or
stop frequency.
Check that a frequency command has been entered correctly, using
Menu #4 "I/O Checking" on the keypad.
Î
Set the frequency command to 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 lower values.
Î
Inspect the external frequency command potentiometers, signal
converters, switches, or relay contacts. Replace any ones that
are faulty.
Î
Connect the external circuit wires correctly to terminals [13], [12],
[11], and [C1].