Parker Products COMPAX-M /-S (L) manual Explanation regarding cam controller, Problem point, 105

Positioning and control functions

Cam controller with compensation for switching delays

Note! With the instruction V0=x (global instruction to all variables), variables V50 ... V70 will also be changed!

Example 1: Normal positioning

	Position	1
V57		1
		cam
V55		control
V61		2
		control cam
V59
		t
	1
1		control signal 1
cam
	0
conrtol		t
	1

Actuator 1 (effect)

	0
	1			t
2		control signal 2	error
cam	0
control				t
	1
		Actuator 1 (effect)
	0
				t

Unit	hardware
Connector	assignment / cable
Technical data
Configuration
Positioning and	control functions
Optimization	functions

Explanation regarding cam controller

COMPAX calculates a travel difference from the lag times of the switch elements (∆ pon and ∆ poff). A constant speed is assumed.

The switching signal is (with increasing setpoint)

activated by ∆ pon before the control cam position for On and deactivated again by ∆ poff before the control cam position for Off.

Requirements for safe and time correct switching of the cam controller:

The cam positions, as well as the range ∆ p before the cam position must be moved through at constant speed.

Problem point:

In Example 1, point ➀, the idle position is located just above V57, so that the control cam 1 cannot be activated too early. This means that the switch-on lag of the actuator cannot be compensated. This causes a switching error.

In this case, COMPAX activates the control cam output immediately after the relevant positioning command is received.

Interfaces

Accessories / options

Status

Parameter

list

105

Error