9-40
Frequency arrival signal--(FAR)
(Function code data = 1)㩷
This signal is turned ON when the difference between the output and set frequencies is within
the allowable error zone (prefixed to 2.5 Hz).
Frequency detection--(FDT)
(Function code data = 2)㩷
This signal is turned ON when the output frequency of inverter has come to the frequency
detection level specified by function code E31. It is turned OFF when the output frequency
drops lower than the detection level for 1 Hz (hysteresis band of the frequency comparator:
prefixed at 1 Hz).
Undervoltage detection--(LU)
(Function code data = 3)㩷
This signal is turned ON when the voltage of the DC link bus of the inverter drops below the
specified level or when the motor stops due to activation of the undervoltage protection feature
(undervoltage trip). It is turned OFF if the DC link bus voltage exceeds the specified voltage.
Torque limiting (Current limiting)--(IOL)
(Function code data = 5)㩷
This signal is turned ON when the inverter is limiting the motor drive current by activating the
current limiter of either software (F43: Function select, F44: Operation level) or hardware (H12
= 1: Current limit). The minimum ON-duration is 100 ms.
Using this signal allows the inverter to show an overload alarm on the display panel of the
external equipment.
Auto-restart after recovery from instantaneous power failure--(IPF)
(Function code data = 6)㩷
This signal is turned ON during the period from when the inverter detects the undervoltage of
the DC link bus and shuts down the output (if auto-restart after a recovery from momentary
power failure is selected (F14 = 4 or 5)) until auto-restarting (the output frequency has
recovered up to the set frequency). At that moment of auto-restarting, this signal is turned OFF.
Motor overload early warning--(OL)
(Function code data = 7)㩷
This signal is used to issue a motor overload early warning for enabling you to take corrective
action before the inverter detects a motor overload (
0L1 alarm) and shuts down its output.
The motor properties are specified by function codes F10 and F12 (Motor characteristics
selection and thermal time constant for electronic thermal overload protection). If a value
calculated from the settings of F10 and F12 exceeds the detection level of the early warning set
by function code E34, this signal is turned ON. Normally, the recommended set current level
for E34 is 80 to 90% of the allowable continuous load current set by function code F11.
Function code E34 is effective for not only the motor overload early warning (OL),
but also the current detection (ID) and low level current detection (IDL).
Retry in operation--(TRY)
(Function code data = 26)㩷
This signal is turned ON when the retry facility specified by function codes H04 (number of
retries) and H05 (retry interval) is being activated.
Refer to function codes H04 and H05 for details of the output timing and number of
retries.
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