4-2 Function Mode (Example 3) If "01" (frequency matching start) is selected in reset frequency matching selection C103, frequency matching start is also enabled when the power is turned on again. When C103 = 00 (0-Hz start), the retry wait time (b003) is ignored. Even if "frequency matching start" is selected, however, the Inverter may start at 0 Hz if: • The output frequency is equal to or lower than 1/2 of the base frequency • The motor induction voltage quickly attenuates 4 Functions Note: The counters used for the Inverter's internal protection are cleared during reset. To shut off the Inverter's output via a multi-function input terminal, use the free-run stop terminal (FRS).
(Example 4) Frequency pull-in restart FW • After the retry wait time (b003) elapses, the Inverter starts output from the b030 set value. The Inverter then decelerates according to the b029 setting, while keeping the output current at the b028 set value. • When the frequency matches the voltage, the Inverter accelerates again, and the frequency is restored to the original level. • If an overcurrent trip occurs under this method, reduce the b028 setting. FRS b028 Output current Decelerates according to b029. Motor rpm Frequency selected in b030 Note:
If a reset signal is input during the retry wait time, the value of "frequency at interruption" stored in the Inverter is cleared, resulting in a 0-Hz start. 3-wire Input Function •This function helps start and stop the Inverter using an auto-recovery contact (e.g. pushbutton switch). 4-85 Power supply FW Frequency matching Free running Motor rpm Frequency matching Free running b003 Data Symbol Function name Status Description 20 STA 3-wire start ON Starts with auto recovery contacts. OFF Irrelevant to the motor operation. 21 STP 3-wire stop ON Stops with auto recovery contacts. OFF Irrelevant to the motor operation. 22 F/R 3-wire forward/reverse ON Reverse OFF:
Forward Available input terminals C001 to C008 Required settings A002 = 01