Home (Orient) Switch Input The Home or Orient function is active in the Bipolar and Serial modes and causes the motor shaft to rotate to a predefined home position. The homing function allows shaft rotation in the drive forward direction only. The home position is located when a machine mounted switch or the encoder “Index” pulse is activated (closed). Home is defined by a rising signal edge at terminal J1-27. The shaft will continue to rotate only in a “Drive Forward” direction for a user defined offset value. The offset is programmed in the Level 2 Miscellaneous Homing Offset parameter. The speed at which the motor will “Home” or orient is set with the Level 2 Miscellaneous Homing Speed parameter.

A machine mounted switch may be used to define the Home position in place of the encoder index channel. A differential line driver output from a solid state switch is preferred for best noise immunity. Connect this differential output to terminals J1-27 and J1-28.

A single ended solid-state switch or limit switch should be wired as shown in Figure 3-9. Regardless of the type of switch used, clean rising and falling edges at J1-27 are required for accurate positioning.

Note: A control may require dynamic brake hardware for Orient (Homing) function to work. The control may trip without dynamic brake hardware installed.

Figure 3-9 Typical Home or Orient Switch Connections

J1

J1

+5V Input

27

INDEX

28

INDEX

Output

29

+5V

Common

30

Common

 

27

INDEX

28

INDEX

29

+5V

30

Common

5VDC Proximity Switch

Limit Switch (Closed at HOME).

See recommended terminal tightening torques in Section 7.

Example:

If the drive is operating in the forward direction when the “Orient” J1-11 input is closed, the drive will decel at “DECEL #1” speed. Then continue in the forward direction at the “Homing Speed” until the index pulse is received. The drive will continue past the int index in the forward direction by the amount of the “Homing Offset”. The drive will then stop and maintain position.

MN722

Receiving & Installation 3-17

Page 28
Image 28
Baldor mn722 manual Typical Home or Orient Switch Connections, Example