Digital Inputs

WARNING
UNINTENDED MACHINE OPERATION Change in DI settings can cause short circuit or turn on power supply to the load. Check if appropriate wiring is done according to the DI settings. Ensure that the three-phase power supply is cut off while changing the DI settings. Failure to follow these instructions can result in death, serious injury, or equipment damage.

The TeSys Tera system supports maximum of 24 digital inputs:

Four digital inputs on LTMT main units.
Up to 20 digital inputs with LTMT expansion units.

Input Configuration

The configuration of the digital inputs can be made through one of the following interfaces:

A PC running the TeSys Tera DTM embedded in a FDT container such as SoMove software.
The LTMTCUF control operator unit.
A PLC or DCS through the communication network.

Each digital input has the following parameters:

Parameter	Setting range
Trigger type	Active high Active low
Validation time	0 to 60000 ms in step of 10 ms
Input source	See list in input assignment

The digital inputs are set by default depending on the motor starter type selected.

Input Type

The Active type and Validation time (t) parameters defines how the physical information connected to the input (A) is converted in the digital input information (B) processed by the LTMT main unit.

Active High Inputs

Active Low Inputs

Input Assignment

Input source	Description
Other	Do not use, reserved for future programmable feature.
Trip Reset DI	Used to configure the digital input for trip reset.
Breaker Close DI	Used in custom logic to customize the application. This input is not directly used by the motor starter logic.
Breaker Open DI	Used in custom logic to customize the application. This input is not directly used by the motor starter logic.
Local-START> DI	Local Forward Start command. Used by the motor starter logic as per the selected starter type.
Local-START>> DI	Local Fast Forward (Forward High speed) Start command. Used by the motor starter logic as per the selected starter type.
Local-STOP DI	Local Stop command. Used by the motor starter logic as per the selected starter type.
Local-START< DI	Local Reverse Start command. Used by the motor starter logic as per the selected starter type.
Local-START<< DI	Local Fast Reverse (Reverse High speed) Start command. Used by starter module as per the selected starter type.
Remote-START> DI	Remote Forward Start command. Used by the motor starter logic as per the selected starter type.
Remote-START>> DI	Remote Fast Forward (Forward High speed) Start command. Used by the motor starter logic as per the selected starter type.
Remote-STOP DI	Remote Stop command. Used by the motor starter logic as per the selected starter type.
Remote-START< DI	Remote Reverse Start command. Used by the motor starter logic as per the selected starter type.
Remote-START<< DI	Remote Fast Reverse (Reverse High speed) Start command. Used by the motor starter logic as per the selected starter type.
Interlock 1	Up to 12 digital inputs can be configured as interlocks. These interlock inputs are used by: Motor starter logic to inhibit motor start. Digital input interlock protection function.
Interlock 2
Interlock 3
Interlock 4
Interlock 5
Interlock 6
Interlock 7
Interlock 8
Interlock 9
Interlock 10
Interlock 11
Interlock 12
Contactor open DI	Used in custom logic to customize the application. This input is not directly used by the motor starter logic.
Run DI	Used by the motor starter logic to check the contactor/RUN feedback.
Block Input	Used for co-ordination purpose. If the block input is present, the TeSys Tera system will block the trip output.
Logic test DI	Used to perform logic tests.
Mode selection 1	Used to select the operating mode: Local 1, Local 2 , Local 3 or Remote.
Mode selection 2
Forced start	Used by forced start function.
Forced stop	Used by the motor starter logic as forced stop.
Self test without trip	Used by test function.
Self test with trip	Used by test function.
None	_