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Frequency setting by analog input (terminal 1, 2, 4)
(4) Continuing the operation at Pr. 777 setting (Pr. 573 = "4")
When the analog input current drops to or below 2mA, the alarm (LF) is output and the inverter continues operation
at the set frequency of Pr. 777. When the analog input current is restored to or above 3mA, the alarm (LF) is
cancelled.
REMARKS
⋅ When the Pr. 573 and Pr. 777 settings are changed after the detection for an input current drop, the inverter operates with the
changed settings. However, the inverter operates with previous settings while in stop or in alarm.
Output frequency
Time
STF
20mA
4mA
LF signal
PID signal
Measured value
Set point (fixed)
Input current
decrease
2mA
3mA
Return
During PID control (reverse action) (Analog input current is restored during deceleration while Pr.573 =3)
Normal operation after the current is restored
OFF during deceleration
An input current drop is detected and the motor decelerates
2mA
3mA
Output frequency
During external operation (Pr. 573 = 4)
STF
Input current
decrease
Time
Return
Analog input
20mA
4mA
LF signal
Continuing the operation at the set
frequency of Pr. 777
Time
Output frequency
Time
STF
20mA
4mA
LF signal
PID signal
Measured value
Set point (fixed)
Input current
decrease
2mA
3mA
Return
During PID control (reverse action) (Pr. 573 = 4)
ON while detecting an input current drop
Time
Continuing the operation at the set
frequency of Pr. 777