Three-Wire Interface Operation - Hitachi WJ200 Series Instruction Manual

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
[STP] (Stop), and
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
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
Code Symbol
STA Start Motor
20
STP Stop Motor
21
F/R Forward/Reverse
22
C001~C007
Valid for inputs:
A002
Required settings
Notes:
• 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] intelligent
terminal assignment is also disabled.
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.
[STA] terminal
[STP] terminal
[F/R] terminal 1
Motor revolution
[F/R] (Forward/Reverse) to three of the intelligent input terminals.
22
Function Name State
ON
OFF
ON
OFF
ON
OFF
= 01
1
0
1
0
0
speed
Description
Start motor rotation on momentary contact (uses
acceleration profile)
No change to motor operation
No change to motor operation
Stop motor rotation on momentary contact (use
deceleration profile)
Select reverse direction of rotation
Select forward direction of rotation
Example (default input configuration shown):
F/R STP STA
7 6 5 4 3
See I/O specs in chapter
4−31
[STA] (Start),
20
A002=01
2 1 L PLC PCS P24
4.
t
21
for