Fuji Electric FRN355VG1S-4J [1003/1046] If neither an alarm code nor light alarm indication l al appears on the led monitor

Fuji Electric FRN7.5VG1S-4J [1003/1046] If neither an alarm code nor light alarm indication l al appears on the led monitor
13.5 If Neither an Alarm Code Nor "Light Alarm" Indication (
l-al
) Appears on the LED Monitor
13-27
Chap. 13 TROUBLESHOOTING
13.5 If Neither an Alarm Code Nor "Light Alarm" Indication
(
l-al
) Appears on the LED Monitor
13.5.1 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
CHECK" 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 the data of F02 to "1.")
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. (Refer to Chapter 3,
Section 3.3.3.9 "Setting up the slide switches.")
(3) A run command with higher
priority than the one
attempted was active, and
the run command was
stopped. Or, a speed
command was active.
Referring to the run command block diagram given in the FRENIC-VG
User's Manual, Chapter 4, check the higher priority run command using
Menu #2 "DATA CHECK" and Menu #4 "I/O CHECK" with the keypad.
Î Correct wrong setting of function code H30 (Communications link
function, Mode selection) or cancel the higher priority run command.
(4) No analog speed command
input.
Check whether the analog speed command is correctly inputted, using
Menu #4 "I/O CHECK" on the keypad.
Î Connect the external circuit wires to terminals [13], [12], [11], [Ai1] and
[Ai2] correctly.
Î Inspect the external speed command potentiometers, signal converters,
switches and relay contacts. Replace any ones that are faulty.
Under V/f control
(5) The reference speed was
below the starting or stop
speed.
Check that a speed command has been entered correctly, using Menu #4
"I/O CHECK" on the keypad.
Î Set the reference speed at the same or higher than the starting speed
(F23).
Î Reconsider the starting speed (F23), and if necessary, change it to the
lower value.
Î Inspect the external speed 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], [Ai1] and
[Ai2] correctly.

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