Inverter Control; Frequency Inverter Control Using Digital Inputs (Two/Three-Wire Control) - Siemens SINAMICS G110D Operating Instructions Manual

Functions

6.2 Inverter Control

6.2 Inverter Control
6.2.1

Frequency inverter control using digital inputs (two/three-wire control)

Configuring start, stop and direction of rotation reversal using digital inputs
If the inverter is controlled using digital inputs, using parameter P0727, you can define how
the motor responds when it is started, stopped, and the direction of rotation is changed
(reversing).
Five different methods are available for controlling the motor. Three of the five control
methods just require two control commands (two-wire control). The other two control
methods require three control commands (three-wire control).
The wide range of setting options is especially intended to be able to emulate existing control
methods on the plant or system side if the inverter has to be integrated into an existing
application. The two most common methods use the factory setting (P0727 = 0) and are
available as standard in SINAMICS inverters.
Note
When clockwise rotation is activated, the inverter generates a clockwise voltage
characteristic at its output terminals. Whether the connected motor actually rotates clockwise
depends on the wiring between the inverter and motor.
Factory setting for "start", "stop", and "direction reversal" control commands
In the factory setting (P0727 = 0), the motor is operated using two control commands. In this
case, two versions are available
Further methods for "start", "stop", and "direction reversal" control commands
Parameter P0727 offers three additional methods for controlling the motor.
● Method 3 for controlling the motor is ideal for drives where the direction of rotation is
manually changed, for instance, traction drives that are controlled from a master switch. It
functions similarly to method 2. Method 3 differs from method 2 with respect to how the
motor responds when both control commands are present at the same time, and that it
also allows you to change the direction of rotation at any time.
● Two further methods are available for controlling motors, each of which use three control
commands. With these methods, the motor is no longer controlled via the signal level
only but also with the positive signal edges of certain commands.
Just the same as method 3 of the two-wire control, the first three-wire control method is
especially suitable for drives where the direction of rotation is manually reversed.
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Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
SINAMICS G110D