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DMC-3425 Chapter 6 Programming Motion• 101
TIME
VELOCITY
TIME
ACCELERATION
TIME
ACCELERATION WITH
SMOOTHING
TIME
VELOCITY WITH
SMOOTHING
Figure 6.7 - Trapezoidal velocity and smooth velocity profiles
Homing
The Find Edge (FE) and Home (HM) instructions may be used to home the motor to a mechanical
reference. This reference is connected to the Home input line. The HM command initializes the motor
to the encoder index pulse in addition to the Home input. The configure command (CN) is used to
define the polarity of the home input.
The Find Edge (FE) instruction is useful for initializing the motor to a home switch. The home switch
is connected to the Homing Input. When the Find Edge command and Begin is used, the motor will
accelerate up to the slew speed and slew until a transition is detected on the Homing line. The motor
will then decelerate to a stop. A high deceleration value must be input before the find edge command
is issued for the motor to decelerate rapidly after sensing the home switch. The velocity profile
generated is shown in Fig. 6.7.
The Home (HM) command can be used to position the motor on the index pulse after the home switch
is detected. This allows for finer positioning on initialization. The command sequence HM and BG
causes the following sequence of events to occur.
1. Upon Begin, motor accelerates to the slew speed. The direction of its motion is
determined by the state of the homing input. A zero (GND) will cause the motor to start