Operating instructions

146 Application manual Positioning 04/08
Operation mode 27: Homing to right falling edge of home switch without
encoder ref. signal with negative hardware limit switch
Dest.: Falling right edge of home switch
A Home switch active 0
Search direction Negative direction
Speed (before reversal of direction of rota-
tion)
Fast Speed 1132
Condition
reversal of direction of rotation
Rising edge
home switch
Speed (after reversal of direction of rotation)
Creep Speed 1133
B Home switch active 1
Search direction Positive direction
Speed
Creep Speed 1133
C Home switch active 0
Search direction Negative direction
Speed (before reversal of direction of rota-
tion)
Fast Speed 1132
Condition
reversal of direction of rotation
Rising edge
negative HW limit switch
Speed (after reversal of direction of rotation)
Fast Speed 1132
Condition
speed change
Rising edge
home switch
Speed (after speed change)
Creep Speed 1133
Home Switch
27
27
27
Neg. HW Limit Switch
A
B
C
v f
v f
v c
v c
v c
v f
A: Homing direction (search direction) is anticlockwise toward negative HW limit
switch if home switch and limit switch are inactive. The home switch is in search
direction. Travel to right edge of home switch is performed at
Fast Speed 1132.
When the home switch is reached, the direction of rotation is reversed. Home posi-
tion is the falling edge of the home switch. Search for the home position is per-
formed at
Creep Speed 1133.
B: When homing is started, the home switch is active. Homing direction (search
direction) is clockwise toward positive HW limit switch. Home position is the falling
edge of the home switch. Homing is performed at
Creep Speed 1133.
C: Homing direction (search direction) is anticlockwise toward negative HW limit
switch. The home switch is not in search direction. The negative limit switch acts as
a reversing switch. When the negative limit switch is reached, the direction of rota-
tion is reversed, and homing is performed in positive direction. Home position is the
falling edge of the home switch. At first, the operation is performed at
Fast Speed
1132, when the left edge of the home switch is reached, the speed is changed to
Creep Speed 1133.
Application manual Positioning 04/08146