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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).
Item Function code Data Description
Terminal function C021 to C025
Alarm relay terminal function C026
40
WAF: Cooling-fan speed
drop signal
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.
Item Function code Data Description
Terminal function C021 to C025
Alarm relay terminal function C026
41
FR: Starting contact
signal
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).
Item Function code Data or range of data Description
Terminal function C021 to C025
Alarm relay terminal function C026
42
OHF: Heat sink overheat warning
signal
Heat sink overheat warning level C064 0. to 200. (℃)
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
Related code
C021 to C025: Terminal [11] to [15] functions
C026: Alarm relay terminal function
Related code
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
Related code