4–26

Using Intelligent Input Terminals

Three-wire Interface Operation

Operations and Monitoring

The 3-wire interface is an industry standard motor control interface. This function uses two inputs for momentary contact start/stop control, and a third for selecting forward or reverse direction. To implement the 3-wire interface, assign 20 [STA] (Start), 21 [STP] (Stop), and 22 [F/R] (Forward/Reverse) to three of the intelligent input terminals. Use a momentary contact for Start and Stop. Use a selector switch, such as SPST for the Forward/Reverse input. Be sure to set the operation command selection A002=01 for input terminal control of motor.

If you have a motor control interface that needs logic-level control (rather than momentary pulse control), use the [FW] and [RV] inputs instead.

Option

Terminal

Function Name

 

Input

 

 

 

Description

 

 

 

 

 

Code

Symbol

 

State

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

STA

Start Motor

 

ON

Start motor rotation on momentary contact (uses

 

 

 

 

 

acceleration profile)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

No change to motor operation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

21

STP

Stop Motor

 

ON

No change to motor operation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

Stop motor rotation on momentary contact (uses

 

 

 

 

 

deceleration profile)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22

F/R

Forward/Reverse

 

ON

Select reverse direction of rotation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

Select forward direction of rotation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Valid for inputs:

C001, C002, C003, C004,

Example (requires input configuration—

 

 

C005, C006

 

see page 3–41):

 

 

 

 

 

 

 

 

 

 

Required settings:

A002 = 01

 

 

 

 

 

 

STP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F/R

STA

 

 

 

 

 

Notes:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

6

5

4

3

 

2

 

1

PCS

 

• The STP logic is inverted. Normally the switch will

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

be closed, so you open the switch to stop. In this

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

way, a broken wire causes the motor to stop

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

automatically (safe design).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• When you configure the inverter for 3-wire interface control, the dedicated [FW] terminal is

automatically disabled. The [RV] intelligentSee I/O specs on page 4–6.terminal assignment is also disabled.