Chapter 4 Explanation of Functions
4-68
4.2.69 Cooling-fan speed drop signal (WAF)
The inverter outputs the cooling-fan speed drop (WAF) signal when
it detects that the rotation speed of its internal cooling fan has
fallen to 75% or less of the full speed.
If "01" has been selected for the cooling fan control (b092), the inverter will not output the WAF signal, even when
the cooling fan stops.
If the WAF signal is output, check the cooling-fan cover for clogging.
You can monitor the state of the WAF signal by using the life-check monitoring function (d022).
WAF: Cooling-fan speed
drop signal
Alarm relay terminal function
4.2.70 Starting contact signal (FR)
The inverter outputs the starting contact (FR) signal while it is
receiving an operation command.
The FR signal is output, regardless of the setting of the run command source setting (A002).
If the forward operation (FW) and reverse operation (RV) commands are input at the same time, the inverter stops the
motor operation.
FR: Starting contact signal
Alarm relay terminal function
4.2.71 Heat sink overheat warning signal (OHF)
The inverter monitors the temperature of its internal heat sink, and
outputs the heat sink overheat warning (OHF) signal when the
temperature exceeds the heat sink overheat warning level (C064).
OHF: Heat sink overheat warning
signal
Alarm relay terminal function
Heat sink overheat warning level
Setting of the threshold temperature
at which to output the heat sink
overheat warning signal
C021 to C025: Terminal [11] to [15] functions
C026: Alarm relay terminal function
b092: Cooling fan control
d022: Life-check monitoring
C021 to C025: Terminal [11] to [15] functions
C026: Alarm relay terminal function
Forward operation command
Reverse operation command
Starting contact signal (FR)
C021 to C025: Terminal [11] to [15] functions
C026: Alarm relay terminal function
C064: Heat sink overheat warning level
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