Reverse Direct Online

Description

The Reverse Direct Online starter requires the following digital inputs and outputs:

• Three digital inputs for motor local start forward, local start reverse and local stop.

• Two digital outputs for motor RUN forward command (CONTACTOR OUTPUT 1) and RUN reverse command (CONTACTOR OUTPUT 2).

Wiring Diagram

Example of wiring diagram of the TeSys Tera system in Reverse Direct Online mode:

KM1: CONTACTOR OUTPUT 1 (Forward)

KM2: CONTACTOR OUTPUT 2 (Reverse)

Logical Diagram

The following diagram shows the logical diagram of Reverse Direct Online starter.

Operating Principle

When Reverse Direct Online 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 Forward 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 forward main CONTACTOR OUTPUT 1.

Similarly, if a reverse 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 reverse main CONTACTOR OUTPUT 2.

The direction change logic depends on the Change Direction .

TeSys Tera system deactivates CONTACTOR OUTPUT 1, and CONTACTOR OUTPUT 2 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.

• Feedback timeout detected.

• Auto stop detected.

• Trip detected.

• Device Internal Error Detected.

DI/DO Default Assignment

When Reverse Direct Online starter type is selected, the default assignment and settings of digital inputs and digital outputs are as follows: