6-21
Chap. 6 TROUBLESHOOTING
[ 34 ]
ecf
Enable circuit failure
Problem The circuit that detects the status of the enable circuit (safety stop circuit) is broken.
Possible Causes What to Check and Suggested Measures
(1) Circuit related to the Enable
circuit affected by strong
electrical noise.
Check if appropriate noise control measures have been implemented (e.g., correct
grounding and routing of signal wires, communication cables, and main circuit
wires).
Î Implement noise control measures.
Î Separate the signal wires from the main power wires as far as possible.
The "Reset alarm" terminal command RST cannot reset this alarm
ecf
. If even a power-off reset cannot restore the
inverter state, the inverter needs to be repaired.
6.5 If the "Light Alarm" Indication (
l-al
) Appears on the LED Monitor
If the inverter detects a minor abnormal state "light alarm", it can continue the current operation without tripping while
displaying the "light alarm" indication
l-al
on the LED monitor. In addition to the indication
l-al
, the inverter blinks the
KEYPAD CONTROL LED and outputs the "light alarm" signal L-ALM to a digital output terminal to alert the peripheral
equipment to the occurrence of a light alarm. (To use the L-ALM, it is necessary to assign the signal to any of the digital output
terminals by setting any of function codes E20 through E24 and E27 to "98.")
Function codes H81 and H82 specify which alarms should be categorized as "light alarm." The available "light alarm" codes are
check-marked in the "Light alarm" object column in Table 6.1.
To display the "light alarm" factor and escape from the light alarm state, follow the instructions below.
Displaying the light alarm factor
1) Press the
key to enter Programming mode.
2) Check the light alarm factor in
5_36
(Light alarm factor (latest)) under Menu #5 "Maintenance Information" in
Programming mode. The light alarm factor is displayed in alarm codes. For details about the alarm codes, see Table 6.1
"Abnormal States Detectable ("Heavy alarm" and "Light alarm" objects)."
For details about the menu transition in Menu #5 "Maintenance Information", see Chapter 3, Section 3.4.6 "Reading
maintenance information – Menu #5 "Maintenance Information." It is possible to display the factors of most recent 3
light alarms in
5_37
(Light alarm factor (last)) to
5_39
(Light alarm factor (3rd last)).
Switching the LED monitor from the light alarm to normal display
If it is necessary to return the LED monitor to the normal display state (showing the running status such as reference frequency)
before the light alarm factor is removed (e.g., when it takes a long time to remove the light alarm factor), follow the steps below.
1) Press the
key to return the LED monitor to the light alarm indication (
l-al
).
2) With
l-al
being displayed, press the key. The LED monitor returns to the normal display state while the KEYPAD
CONTROL LED continues blinking.
Releasing the light alarm
1) Remove the light alarm factor that has been checked in
5_36
(Light alarm factor (latest)) under Menu #5 "Maintenance
Information" in Programming mode, in accordance with the troubleshooting procedure. The reference page for the
troubleshooting corresponding to each light alarm factor is shown in "Ref. page" column in Table 6.1.
2) Once the light alarm factor is removed, the "light alarm" indication
l-al
on the LED monitor disappears and the
KEYPAD CONTROL LED stops blinking. If the KEYPAD CONTROL LED continues blinking, it means that any light
alarm factor has not completely been removed and the inverter is still in the light alarm status. Proceed to other
troubleshooting procedures.
When all of the light alarm factors have been removed, the digital output L-ALM is also turned OFF automatically.
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