9-60
Frequency detected -- FDT
(Function code data = 2)
This output signal comes ON when the output frequency exceeds the frequency detection
level specified by E31, and it goes OFF when the output frequency drops below the
"Frequency detection level (E31) - Hysteresis width (E32)."
Undervoltage detected -- LU
(Function code data = 3)
This output signal comes ON when the DC link bus voltage of the inverter drops below the
specified undervoltage level, and it goes OFF when the voltage exceeds the level.
When this signal is ON, the inverter cannot run even if a run command is given.
This signal is ON also when the undervoltage protective function is activated so that the
motor is in an abnormal stop state (e.g., tripped).
Inverter output limiting -- IOL
(Function code data = 5)
This output signal comes ON when the inverter is limiting the output frequency by activating
any of the following actions (minimum width of the output signal: 100 ms).
• Current limiting by software (F43 and F44)
• Instantaneous overcurrent limiting by hardware (H12 = 1)
• Automatic deceleration (Anti-regenerative control) (H69 = 2 or 4)
When the IOL is ON, the output frequency may have deviated from the specifie
reference frequency because of the limiting function above.
Auto-restarting after momentary power failure -- IPF
(Function code data = 6)
This output signal is ON either during continuous running after a momentary power failure or
during the period from when the inverter detects an undervoltage condition and shuts down
the output until completion of a restart sequence (the output reaches the reference frequency).
To enable the IPF, set F14 (Restart mode after momentary power failure) to "4" (Enable
restart (Restart at the frequency at which the power failure occurred)) or "5" (Enable restart
(Restart at the starting frequency)) beforehand.
Motor overload early warning -- OL
(Function code data = 7)
This output signal is used to issue a motor overload early warning that enables you to take a
corrective action before the inverter detects a motor overload alarm
0l1
and shuts down its
output. (Refer to the description of E34.)
Auto-resetting -- TRY
(Function code data = 26)
This output signal comes ON when auto-resetting is in progress. The auto-resetting is
specified by H04 and H05 (Auto-reset). Refer to the descriptions of H04 and H05 for details
about the number of resetting times and reset interval.
Refer to the description of function codes H04 and H05 for details of the signal output
timing and the number of retries.
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