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Enable circuit failure
Problem The circuit that detects the status of the enable circuit is broken.
Possible Causes
What to Check and Suggested Measures
(1)
Contact failure of the
interface printed circuit
board (PCB).
(2)
Enable circuit logic error
Check that the interface PCB is firmly mounted in place. (Turning the inverter
power off and on clears this alarm.)
Check that the two output levels of the safety switch or other safety device are
not discrepant. (EN1/EN2 = High/High or Low/Low)
(Turning the inverter power off and on clears this alarm.)
10.5 If the “Light Alarm” Indication (
) 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
on the LED monitor. In addition to the indication
, the inverter displays
the "L-ALARM" (blinking) on the LCD monitor 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 10.1.
To display the "light alarm" and escape from the light alarm state, follow the instructions below.
Displaying the light alarm
1) Press the
key to enter Programming mode.
2) Shift to Menu #5 "5: MAINTENANC," scroll to Page 11, and check the "LALM1" (Light alarm (Latest)). The light alarm
is displayed in alarm codes. For details about those codes, see Table 10.1 "Abnormal States Detectable ("Alarm"
and "Light Alarm" Objects)."
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 is removed (e.g., when it takes a long time to remove the light alarm), follow the steps
below.
1) Press the
key to return the LED monitor to the light alarm indication (
).
2) With
being displayed, press the
key. The LED monitor returns to the normal display state, but the
"L-ALARM" on the LCD monitor continues blinking.
Releasing the light alarm
1) First remove the "LALM1" (Light alarm (Latest)) under Menu #5, in accordance with the troubleshooting procedure.
The reference page for the troubleshooting corresponding to each light alarm is shown in "Ref. page" column in
Table 10.1.
2) To return the LED monitor from the
display to the normal display state (showing the running status such as
reference frequency), press the
key in Running mode.
If the light alarm(s) has been successfully removed in step 1) above, the "L-ALARM" blinking on the LCD monitor
disappears and the digital output
L-ALM
also goes OFF. (If any light alarm persists, e.g., detecting a DC fan lock, the
"L-ALARM" continues blinking and the
L-ALM
remains ON.)
