Positioning with Digital Inputs

Home Position Return

 

 

4.3.2Dog mode home position return

In this mode, instead of the encoder Z-phase(Fig. 4-6), the DOG signal is used to switch from “home position return speed” PC04 to “creep speed” PC05. You can use parameter PD16 “prox- imity dog detection polarity” to specify whether a logical “1” or a logical “0” should be identified as an active DOG signal.

As in ￿above, the physical home position can be shifted in relation to the home (zero) position of the encoder (Z-phase) with PC06 “home position offset (shift)”. In addition to this you can also set a non-zero coordinate for the home position with PC07.

Conditions for the proximity dog signal:

The proximity dog signal (DOG) must fulfill the following conditions to ensure that the Z-phase of the encoder is detected during the activation period of the DOG signal:

V td L1 ￿ 60 ￿ 2

L2 ￿ 2 ￿ ￿S

L1 = Length of the DOG signal in [mm]

V= Home position return speed in [mm/min] td = Deceleration time in [s]

L2 = Length of the DOG signal in [mm]

￿S = Distance for one rotation of the motor in [mm]

MR-J3-T

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