Three-wire interface operation – XLT Hitachi X200 User Manual

Page 174

Advertising
background image

Three-wire Interface Operation

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

Code

Terminal

Symbol

Function Name

State

Description

ON

Start motor rotation on momentary contact (uses
acceleration profile)

20

STA

Start Motor

OFF

No change to motor operation

ON

No change to motor operation

21

STP

Stop Motor

OFF

Stop motor rotation on momentary contact (use
deceleration profile)

ON

Select reverse direction of rotation

22

F/R

Forward/Reverse

OFF

Select forward direction of rotation

Valid for inputs:

C001~C005

Required settings

A002 = 01

Notes:
x 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).

x When you configure the inverter for 3-wire

interface control, the dedicated [FW] terminal is
automatically disabled. The [RV] intelligent
terminal assignment is also disabled.

Example (default input configuration shown—see

page 3–49

):

See I/O specs on

page 4–6.

The diagram below shows the use of 3-wire control. STA (Start Motor) is an edge-sensitive
input; an OFF-to-ON transition gives the Start command. The control of direction is level-
sensitive, and the direction may be changed at any time. STP (Stop Motor) is also a level-
sensitive input.

5

4

3

2

1

L PCS P24

F/R

STA

STP

[STP] terminal

1

0

t

[F/R] terminal

1

0

Motor revolution

speed

[STA] terminal

1

0

4

25

Operations and

Monitori

ng

4

−25

Operations and

Monitoring

Advertising