5-55
Inverter running -- (RUN)
(Function code data = 0)
This output signal is used to tell the external equipment that the inverter is running at a starting
frequency or higher. It comes ON when the output frequency exceeds the starting frequency, and
it goes OFF when it is less than the stop frequency. It is also OFF when the DC braking is in
operation.
If this signal is assigned in negative logic (Active OFF), it can be used as a signal indicating
"inverter being stopped."
Frequency arrival signal -- (FAR)
(Function code data = 1)
This output signal comes ON when the difference between the output frequency and reference
frequency comes within the allowable error zone. (prefixed to 2.5 Hz).
Frequency detected -- (FDT)
(Function code data = 2)
This output signal comes ON when the output frequency exceeds the frequency detection level
specified by function code E31, and it goes OFF when the output frequency drops below the
"Detection level - 1 Hz (hysteresis band of frequency comparator: prefixed at 1 Hz)."
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.
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).
When this signal is ON, a run command is disabled if given.
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: Current limiter (Mode selection) and (Level))
• Instantaneous overcurrent limiting by hardware (H12 = 1)
• Automatic deceleration (H69 = 3))
When the (IOL) signal is ON, it may mean that the output frequency may have deviated
from (or dropped below) the frequency specified by the frequency command because
of this limiting function.
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 has detected an undervoltage condition and shut down
the output until restart has been completed (the output has reached the reference frequency).
To enable this (IPF) signal, set F14 (Restart mode after momentary power failure) to "3: Enable
restart (Continue to run)," "4: Enable restart (Restart at the frequency at which the power failure
occurred)," or "5: Enable restart (Restart at the starting frequency)" beforehand.
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