3-Wire Input Function - Omron 3G3RX User Manual

(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
Motor rpm
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) Active Frequency Matching restart
FW
RS
Output
current
Inverter output
frequency
Trip occurs
Motor rpm
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).
Data Symbol
20 STA
21 STP
22 F/R
Available input terminals
Required settings
•Set RUN command selection A002 to 01 (control circuit terminal block).
Power
supply
FW
Free running
b028
Decelerates
according to b029.
Frequency selected
in b030
b003
Function name
3-wire start
3-wire stop
3-wire forward/reverse
Frequency matching
• 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.
Status
ON Starts with auto recovery contacts.
OFF Irrelevant to the motor operation.
ON Stops with auto recovery contacts.
OFF Irrelevant to the motor operation.
ON Reverse
OFF: Forward
C001 to C008
A002 = 01
4-2 Function Mode
Description
4-88
4