6-10
6.4 If the "Light Alarm" Indication (
l-al
) Appears on the LED Monitor
If the inverter detects a minor abnormal state, 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 signal, it is necessary to assign this
signal to any of the digital output terminals by setting any of function codes E20 to E21 and E27 to "98.")
Function codes H81 and H82 specify which alarms should be categorized as "light alarm."
Selectable factors
(codes) are the codes of light alarm objects shown in Table 6.3-1.
To display the "light alarm" factor and escape from the light alarm state, follow the instructions below.
Check method of light alarm factors
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. See Table 6.3-1 for code details.
See Chapter 3 "3.4.5 Reading maintenance information" for the details of screen transition in the
"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) temporarily before removing the light alarm factor because it takes a long time to remove the
light alarm factor, for example, follow the steps below.
1)
Press the
key to return the LED monitor to the light alarm indication (
l-al
).
2)
Press
key in a state of light alarm display (
l-al
). Keypad display returns from light alarm display (
l-al
) to
monitor display (including frequency display) in the ordinary running state. KEYPAD CONTROL LED
continues blinking, though.
Release method of light alarms
1)
See function codes (H81, H82) corresponding to light alarm factors (codes) checked in the Maintenance
Information to remove the occurrence factors of light alarms.
2)
To return the LED monitor from the
l-al
display to the normal display state (showing the running status such
as reference frequency), press the
key in Running mode.
If the light alarm factor(s) has been successfully removed in step 1) above, the KEYPAD CONTROL LED
stops blinking and the digital output L-ALM also goes OFF. If any light alarm factor persists (e.g., detecting a
DC fan lock), the KEYPAD CONTROL LED continues blinking and the L-ALM remains ON.
6.5 Problems with inverter settings
[ 1 ]
Nothing appears on the LED monitor
Possible Causes
Check and Measures
(1) No power (neither main power
nor auxiliary control power) is
supplied to the inverter.
Check the input voltage and interphase voltage unbalance.
Switch on the molded-case circuit breaker, the earth-leakage circuit
breaker (with overcurrent protective function) or the magnetic
contactor.
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.
In case of supplying the inverter through the AC input terminals (L1 to
L3), check if the shorting bar has been removed between terminals P1
and P(+) or if there is a poor contact between the shorting bar and those
terminals.
Mount a shorting bar or a DC reactor between terminals P1 and
P(+). In case of poor contact, tighten the screws.
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