6-9
Chap. 6 TROUBLESHOOTING
6.3.2 Problems with inverter settings
[ 1 ] Nothing appears on the LED monitor.
Possible Causes What to Check and Suggested Measures
(1) No power (neither main power
nor auxiliary control 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.
(2) The power for the control PCB
did not reach a sufficiently high
level.
Check if the jumper bar has been removed between terminals P1 and P(+) or if there
is a poor contact between the jumper bar and those terminals.
Î Mount a jumper bar or a DC reactor between terminals P1 and
P(+). For poor contact, tighten up the screws.
Check whether the keypad is properly connected to the inverter.
Î Remove the keypad, put it back, and see whether the problem recurs.
Î Replace the keypad with another one and check whether the problem recurs.
(3) The keypad was not properly
connected to the inverter.
When running the inverter remotely, ensure that the extension cable is securely
connected both to the keypad and to the inverter.
Î Disconnect the cable, reconnect it, and see whether the problem recurs.
Î Replace the keypad with another one and check whether the problem per recurs.
[ 2 ] The desired menu is not displayed.
Possible Causes Check and Measures
(1) The menu display mode is not
selected appropriately.
Check the data of function code E52 (Keypad (Menu display mode)).
Î Change the E52 data so that the desired menu appears.
[ 3 ] Data of function codes cannot be changed.
Possible Causes What to Check and Suggested Measures
(1) An attempt was made to
change function code data that
cannot be changed when the
inverter is running.
Check if the inverter is running with Menu #3 "Drive Monitoring" using the keypad
and then confirm whether the data of the function codes can be changed when the
motor is running by referring to the function code tables.
Î Stop the motor then change the data of the function codes.
(2) The data of the function codes
is protected.
Check the data of function code F00 (Data Protection).
Î Change the F00 data from "Enable data protection" (1 or 3) to "Disable data
protection" (0 or 2).
(3) The WE-KP terminal
command ("Enable data
change with keypad") is not
entered, though it has been
assigned to a digital input
terminal.
Check the data of function codes E01 through E07, E98 and E99 and the input signal
status with Menu #4 "I/O Checking" using the keypad.
Î Input a WE-KP command through a digital input terminal.
(4) The key was not pressed. Check whether you have pressed the key after changing the function code data.
Î Press the key after changing the function code data.
Î Check that
saue
is displayed on the LED monitor.
(5) The data of function codes F02,
E01 through E07, E98, and E99
cannot be changed.
Either one of the FWD and REV terminal commands is turned ON.
Î Turn OFF both FWD and REV.
(6) The function code(s) to be
changed does not appear.
If Menu #0 "Quick Setup" (
*fn:
) is selected, only the particular function codes
appear.
Î With Menu #0 "Quick Setup" (
*fn:
) being selected, press the
key to call
up the desired menu from
!f__
to
!y__
. Then select the desired function
code and change its data. For details, refer to Chapter 3, Table 3.4 "Menus
Available in Programming Mode."
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