3. KUAX 671 dyn 3.1. Definition of dead-time compensation ‘When changing the encoder rotation speed, the physical dead-time compensation of mechanical positioning elements (e.g. relays, magnetic valves, rotation magnets etc.) may appear as interference. In order to compensate this interference, it is necessary to attribute to the switch-on and switch-off values ofa cam a constant time factor (dead-time compensation) independent of the rotation speed. Thus, the dead-time ‘compensation of the positioning element is considered a constant factor at any encoder rotation speed. on united ‘The KUAX 671 dyn offers four groups of dead-time compensati the deadinto 8 outputs respectively.
In each dead-time compensation group ds time compensation for the whole group can be set in250millisecon range is 1 to ms.The times thus The time y entl of each other. independ set affect all 8 outputs of the selected dead-time compensation group and are valid for 7 programs. dead-time compensation group 0 = Outputs Oto 7 8 to 15 dead-time compensation group 2 = Outputs 16 to 23 the *key. It is shown ‘You can call the encoder rotation speed up by pressingfollowing resolution: the with speed rotation m maximu the of % 60 up to 180/360 encoder = 3 rpm 1000 enco=der 1 rpm Examples of compensation ofthe dead-time compensation is given.
We assume that In the examples below an explanatory illustration the cam closes for an at a certain encoder resolution and rotation speed according time. Example: compensation of 20 ms, the If, for example, a cam is set for a dead-timebefore the switching-onJ-off values ms 20 off and on output always switches rotation speed. In this example, the cam programmed before at every encoder rotation speed.
is moved forward at an increasing Original cam dead-time compensation group 1 = Outputs © 10 20 30 40 50 60 70 80 90 dead-time compensation group 3 = Outputs 24 to 31 ‘The dead-time compensation can be programmed either via the hand terminal (as from version 3.1 on) using the function key Cirl-N or by using the PC editor "NOBES". Dyn cam 20 ms ‘The maximum encoder rotation speeds are set as follows: i pensation dead-time com- Absolute value encoder 180 steps/rev.: 500 rpm ‘Absolute value encoder 360 steps/rev.: 250 rpm ‘Absolute value encoder 1000 steps/rev.: 120 rpm If the maximum rotation speed is reached, the Parity LED lights up. Note:
If the rotation speed is increased any further, the function remains active up to ca. 150 % of the maximum rotation speed. Only the resolution is reduced. « 120 as > 7 10 20 30 40 50 60€ 20 70ms? 80. 90 «20 ms>