6-4
6.3 If Neither an Alarm Code Nor "Light Alarm" Indication (
l-al
) Appears on the LED Monitor
This section describes the troubleshooting procedure based on function codes dedicated to motor 1 which are marked with an
asterisk (*). For motors 2 to 4, replace those asterisked function codes with respective motor dedicated ones (refer to Chapter 5,
Table 5.5).
For the function codes dedicated to motors 2 to 4, see Chapter 5 "FUNCTION CODES."
6.3.1 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 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.
Î If only the auxiliary control power input is supplied, also supply the main power
to the inverter.
(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 run command source. (Set F02 data to "1.")
Î Correct the assignment of commands FWD and REV with 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 slide switch (SW1) on the control printed circuit
board (control PCB) is properly configured.
(3) No Enable input Check the input status of terminal [EN] with Menu #4 "I/O Checking" using the
keypad.
Î Correct the external circuit wiring to control circuit terminal [EN].
(4) No rotation direction command
(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).
(5) 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.
(6) A run command with higher
priority than the one attempted
was active, and the run
command was stopped.
Referring to the block diagram of the frequency command block (refer to the
FRENIC-MEGA User's Manual, Chapter 6),
check the higher priority run command
with Menu #2 "Data Checking" and Menu #4 "I/O Checking" using the keypad.
Î Correct any incorrect function code data settings (in H30, y98, etc.) or cancel the
higher priority run command.
(7) No analog frequency command
input.
Check whether the analog frequency command (reference frequency) is correctly
inputted, using Menu #4 "I/O Checking" on the keypad.
Î Connect the external circuit wires to terminals [13], [12], [11], [C1], and [V2]
correctly.
Î When terminal [C1] is used, check the slider position of terminal [C1] property
switch (SW5) and the setting of the thermistor mode selection (H26).
(8) The reference frequency was
below the starting or stop
frequency.
Check that a reference frequency has been entered correctly, using Menu #4 "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.
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