Star Delta
Description
The Star Delta starter requires the following digital inputs and outputs:
-
Two inputs for motor local start and local stop.
-
Three outputs for motor RUN command, main connection (CONTACTOR OUTPUT 1), delta connection (CONTACTOR OUTPUT 2), and star connection (CONTACTOR OUTPUT 3).
Wiring Diagram
Example of wiring diagram of the TeSys Tera system in Star Delta mode:
KM1: CONTACTOR OUTPUT 1 (Main)
KM2: CONTACTOR OUTPUT 2 (Delta)
KM3: CONTACTOR OUTPUT 3 (Star)
Logical Diagram
The following diagram shows the logical diagram of the Star Delta starter:
Operating Principle
When Star Delta mode is selected, motor start is possible from one of the following sources:
-
Start command from valid source as per the selected operating mode.
-
Start command from Forced start function.
-
Start command from automatic restart function.
If a start command is received from either of the above source and if the motor is ready to start (that is no inhibit cause detected) , then TeSys Tera system activates the main CONTACTOR OUTPUT 1 and star CONTACTOR OUTPUT 3 and starts the time in Star timer (T1 or delay 1).
Once the time in Star timer has elapsed, TeSys Tera system deactivates Star CONTACTOR OUTPUT 3 and starts the changeover timer (T2 or delay 2).
Once the changeover timer has elapsed, TeSys Tera system activates Delta CONTACTOR OUTPUT 2.
TeSys Tera system deactivates CONTACTOR OUTPUT 1, CONTACTOR OUTPUT 2, and CONTACTOR OUTPUT 3 if any of the following motor stop cause is detected:
-
Stop command from valid source as per the selected operating mode.
-
Stop command from a digital input assigned to Forced stop (optional), refer to Input Assignment .
-
Stop command from automatic restart function.
-
Trip detected
.
DI/DO Default Assignment
When Star Delta starter type is selected, the default assignment and settings of digital inputs and digital outputs are as follows:
|
DI parameters |
DI01 settings |
DI02 settings |
DI03 settings |
DI04 settings |
|---|---|---|---|---|
|
Trigger type |
Active high |
Active low |
Active high |
Active high |
|
Input source |
Local-START> DI |
Local-STOP DI |
Other |
Mode Selection 1 |
|
Validation time |
10 ms |
10 ms |
10 ms |
10 ms |
|
DO parameters |
DO01 settings |
DO02 settings |
DO03 settings |
|---|---|---|---|
|
Active type |
Active high |
Active high |
Active high |
|
Input source |
CONTACTOR OUTPUT 1 |
CONTACTOR OUTPUT 2 |
CONTACTOR OUTPUT 3 |
|
Tag |
CNTR OP 1 |
CNTR OP 2 |
CNTR OP 3 |
|
Output type |
Level |
Level |
Level |
Delay Settings
|
Parameter |
Description |
Setting range |
Deafult value |
|
Delay 1 |
Start timer |
0.01 to 600.00 s in step of 0.01 s |
10.00 s |
|
Delay 2 |
Changeover timer |
0.01 to 600.00 s in step of 0.01 s |
0.30 s |