User`s manual

STOPS
SLOWS
DOWN
SCREW
HOME
LIMIT
SOFT
LIMIT
NUT
STEP
MOTOR
15 16
HOMING MODES
There are two Homing Modes that may be initiated, H0 and H1.
H0 HOMING MODE: This mode causes the motor to run at Max Speed in
the direction selected. The motor runs until the nut encounters the SOFT
limit switch, at which time the motor decelerates to the Base Speed. The nut
continues to run at Base Speed until it hits the Home limit switch. This may
be illustrated by using a step motor driving a leadscrew as shown below.
CAUTION: The two limit switches should be placed such that the nut after
hitting the Soft limit switch has enough time to get to Base Speed before
encountering the Home limit switch.
H1 HOMING MODE: When this homing mode is selected, the nut seeks
home at Max speed. It decelerates to Base speed when the soft limit switch
is encountered. The Soft limit switch must remain closed until the motor
completely decelerates to Base speed, at which time the controller causes
the motor to reverse direction and run at Base speed until the Soft limit
switch is no longer closed. This mode is illustrated below. This Homing
mode uses only one switch, but a flag is required to keep the switch closed
during the deceleration cycle. If only a momentary switch closure is made,
the motor will decelerate to Base speed and stop. This stopping point may
not be accurate or repeatable; so, the flag is necessary.
SETTING THE
MOVE DISTANCE
The index count or move distance for the DPD72451 can be accomplished by
a number of methods. The easiest way is to use the red switches labeled
“Internal Index Number” on the unit; these switches are used by default.
External Count Modules may also be used. These include the Click Pot
Module, AA1748, the Thumbwheel Module, AA1760, the BCD Input Module,
AA2210, and the Quad Board, AA1754. These modules set the distance of
the move, but will allow for different variations in interfacing (see descriptions
in next section).
JUMPERS
There are four jumpers on the Manual Preset Indexer board. The first
jumper, JP1, is used to set the debounce delay time for the JOG, HOME, and
INDEX inputs. When JP1 is in the “1-2" position, the debounce delay is
approximately 12.5 milliseconds. When JP1 is in the “2-3" position, the
debounce delay is approximately 0.3 milliseconds. The active low signal on
these inputs must be wider than the debounce delay time.