Hitachi L100-M Series Addendum Manual page 24

24
Operations and Monitoring
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
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 A_02=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
Code Symbol
20 STA
21 STP
22 F/R
Valid for inputs:
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 inter-
face control, the [FW] and [RV] intelligent terminal
assignments are disabled.
•
The [F/R] terminal signal level is evaluated only
when an [STA] pulse occurs.
•
You must assign both the [STA] and [STP] intelli-
gent inputs in order for the three-wire function to
work.
•
If you do not assign the [F/R] intelligent input terminal, the three-wire operation will be limited to the
forward direction only.
Input
Function Name
State
Start Motor ON
OFF
Stop Motor ON
OFF
Forward/Reverse ON
OFF
C_01, C_02, C_03, C_04,
C_05
A_02 = 01
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 (uses
deceleration profile)
Select reverse direction of rotation
Select forward direction of rotation
Example (requires input configuration—
see Chapter 3 in L100 Instruction Manual):
STP
F/R
L 5 4 3
for
-MFR2
models
See I/O specs in the L100 Instruction Manual
STA
2 1 P24
for
-MFU2
models