0: 3-Wire Sequence

Setting Value	Function	Description
0	3-Wire Sequence	Sets the direction of motor rotation for 3-wire sequence.

If the 3-wire sequence is set to a terminal that is not MFDI terminals S1 and S2, these terminals will be the input terminals for Forward run/Reverse run command. The drive will automatically set terminal S1 to Run command (RUN) and terminal S2 to Stop command (STOP).

When terminal S1 (Run command) activates for 1 ms minimum, the drive rotates the motor. When terminal S2 (Stop command) deactivates, the drive stops. When terminal Sx that is set in 3-wire sequence deactivates, the drive operates in the forward direction, and when it activates, the drive operates in the reverse direction.

Warning

Sudden Movement Hazard

Set the MFDI parameters before you close control circuit switches.

Incorrect Run/Stop circuit sequence settings can cause serious injury or death from moving equipment.

Warning

Sudden Movement Hazard

When you use a 3-Wire sequence, set A1-03 = 3330 [Initialize Parameters = 3-Wire Initialization] and make sure that b1-17 = 0 [Run Command at Power Up = Disregard Existing RUN Command] (default).

If you do not correctly set the drive parameters for 3-Wire operation before you energize the drive, the motor can suddenly rotate when you energize the drive.

Figure 1. 3-Wire Sequence Wiring Example

Note:

To input the Run command, activate the terminal for 1 ms minimum.
The default setting for b1-17 [Run Command at Power Up] is 0 [Disregard existing RUN command]. If you enable the Run command on an energized drive, the protective function activates and the flashes quickly. When the application will let an energized drive Run, set b1-17 = 1 [Accept Existing RUN Command].