Hitachi SJ700-2 instruction manual Cooling-fan speed drop signal WAF, Starting contact signal FR

Related code

C021 to C025: Terminal [11] to [15] functions

C026: Alarm relay terminal function

Related code

C021 to C025: Terminal [11] to [15] functions

C026: Alarm relay terminal function

b092: Cooling fan control

d022: Life-check monitoring

Chapter 4 Explanation of Functions

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	40	WAF: Cooling-fan speed
Alarm relay terminal function	C026		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	41	FR: Starting contact
Alarm relay terminal function	C026		signal

Forward operation command

Reverse operation command

Starting contact signal (FR)

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).

Related code

C021 to C025: Terminal [11] to [15] functions

C026: Alarm relay terminal function

C064: Heat sink overheat warning level

Item	Function code	Data or range of data	Description
Terminal function	C021 to C025	42	OHF: Heat sink overheat warning
Alarm relay terminal function	C026		signal
			Setting of the threshold
Heat sink overheat warning level	C064	0. to 200. (℃)	temperature at which to output the
			heat sink overheat warning signal

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