D2 Drive User Guide v1.8 8. Protection Function
HIWIN Mikrosystem Corp. 242
8.4. Limit protection
8.4.1. Hardware limit protection
D2 drive has a hardware limit protection. The hardware limit is usually the photoelectric switch
or micro switch installed in the positioning platform. It is used to identify the stroke of
mechanical movement. When the motor hits the hardware limit, the emergency brake
protection will be activated. Usually, the hardware limit switch is a normally close sensor.
When the hardware limit switch is touched, the drive stops the motor by using the emergency
stop deceleration (“Dec. kill”). At this moment, the drive can only accept the motion command
in the opposite direction.
After clicking to enter the protection center, select the “HW limit protection” tab to open
the configuration page of hardware limits. To enable the hardware limit protection, the option
of “enable HW limit” ( ) must be checked. The digital input pin of hardware limit
can be set by clicking the “Set…” button on this page. Clicking this button will appear the
configuration page of I/O center. Refer to Section 5.5.1 for the setting information.
Fig. 8-11
8.4.2. Software limit protection
In addition to the hardware limit protection, D2 drive also has the software limit protection. It
also plays the role of protecting over stroke. When the motor reaches the position of software
limit, the drive can only accept the command to move in the opposite direction.
Click to enter the protection center, and select the “Protection” tab. The “Limits” area is
the configuration page of software limits. After checking the option of “enable sw limit”, the
upper and lower software limits can be set. Moreover, the software limit protection can be
activated by checking the option of “enable sw limit” in the performance center.
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