Pwm Control During Positioning; General - WAGO -I/O-SYSTEM 750 Manual

2.1.1.9.10

PWM Control during Positioning

2.1.1.9.10.1

General

It is possible to enable PWM control independently of the drive mode.
Basically, PWM control will have no impact on the direction and the number
of moving cycles during the positioning process. It is, in fact, possible to
control the revolution speed or the torque during a moving cycle using PWM
control.
In order to illustrate the positioning process via PWM control, the moving
cycle is divided up into five phases:
Phase Function
P1
P2
P3
P4
P5
100 %
Fig. 2.1.1-21: Division of the moving cycle
P1:
Phase P1 only exists if a soft start is configured via parameter
RampTime_START. Without ramp, this phase has a runtime of 0 s so that the
revolution speed only increases in phase P2 or even phase P3.
P2:
Phase P2 is defined by the two parameters CurrentLimit_PWM and
CurrentLimit_Time. CurrentLimit_PWM defines the pulse duty cycle of the
final stage trigger signal and CurrentLimit_Time defines the duration of Phase
P2.
WAGO-I/O-SYSTEM 750
I/O-Modules
Start ramp
Current limiting phase (CurrentLimit_PWM)
Approach at high speed
Approach at lower speed (creep feed)
Deceleration ramp
P1
CurrentLimit_PWM
50 %
0 %
RampTime_START CurrentLimit_Time
750-636 [DC Drive Controller]
P2 P3
PWM 100 %
ShutDown_Distance > Prestop
CurrentControl_PWM
Function Description
P4 P5
Set Point Position
Prestop
RampTime_STOP
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