Instance analysis - PLC control servo motor

Explain for everybody today is about PLC controller control servo motor three ways:

a, torque control and position control three, speed mode

1

torque control torque control way is through external analog input or directly address assignment to set the size of the output torque of the motor shaft foreign, embodied in 10 v corresponds to 5 nm, for example, when the external analog set to 5 v motor output shaft is 2. 5 nm: if the motor axle load is lower than 2. 5 nm motor forward, external load is equal to 2. 5 nm motor does not turn, greater than 2. 5 nm motor reversal ( Usually in a gravity load conditions) 。

can through instant change analog set to change the torque size set, also can through the communication way to change the address of the corresponding numerical values. 2

position control position control mode is generally through the external input pulse frequency to determine the size of the rotational speed, by the number of pulses to determine the rotation Angle, there are some servo may directly by way of communication for assignment speed and displacement.

due to the location patterns can have very strict control on speed and position, so generally used in the positioning device.

3 speed mode

through analog input or pulse frequency can control the rotation speed, in outer ring with superior control device can also locate speed when the PID control model, but it must be the position signal of the motor or load position signal directly to the upper feedback to do operation.

SINAMICS V90 system, for example.

SINAMICS V90 according to different application is divided into two versions:

1. Pulse sequence version ( Integrated with pulse, analog, USS/MODBUS) ;

2。 PROFINET communication version.

SINAMICS V90 pulse version can implement internal positioning function, at the same time with pulse position control, speed control and torque control mode.

shown below instructions for pulse train speed control mode ( PTI) The default interface definition, standard application habit.

allows you to use only one pulse input channels at the same time, other control signals are also free allocation to the digital quantity input and output terminals, please see the operating manual.

digital quantity input, support NPN and PNP two types. The wiring diagram of the 24 v power supply is as follows:

1) Used for SINAMICS V90 24 v power supply. All regarding the signal must be connected to use the same 24 v power supply controller, such as SINAMICS V90.

( 2) Isolation of the digital quantity input power, can use the power controller.

( 3) Isolation of the digital output power, can use the power controller.

SINAMICS V90 servo drive:

motor brake signal, Only used for SINAMICS V90 200 V driver) 。 SINAMICS V90 200 V driver needs to use external relay connected to the motor brake.

SINAMICS V90 pulse sequence version of the system wiring diagram:

SINAMICS V90 PROFINET version of the system wiring diagram:

1, SIMOTICS S - 1 fl6 SH20 low inertia motor type, SH30 and SH40 use cable connector.

2, here shows the brake cable connection is only applicable to V90 400 V drive. V90 200 V driver needs to use external relays for motor brake cable connection.

4, I/O cable must be used to implement the SINAMICS V90 PROFINET 200 V driver brake control, and implement except PROFINET communications needs additional applications of DI/DO.

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