Electro Cam PL-1746 Series - Manual (Page 100)

6-3 Groups & Modes
Mode 1 - Reset to Preset Position
Description Outputs in a group assigned to Mode 1 are always enabled to turn on at their pro-
grammed setpoints. However, when the corresponding input terminal is energized, the
machine position for the group immediately resets to the preset value programmed
through the GROUP OFFSET function. Once the position is reset, the input terminal
will have no effect until it is turned off and the resolver reaches the leading edge of a
pulse programmed into the corresponding group channel.
Applications This mode can be used to automatically adjust phase relationships between machine
sections. It can also be used in applications where some machine sections run multiple
cycles per resolver revolution.
Details • The group position resets at the leading edge of the input terminal signal, regardless
of how long the terminal is on.
• Once a reset occurs, the input terminal has no effect until it is de-energized and the
leading edge of a pulse in the corresponding group channel re-arms the terminal.
• When the position of a group resets, the group
channel is affected in the same manner as the
output channels.
• On start-up, the input terminal is armed and the
group position is the same as the value pro-
grammed in MACHINE OFFSET. On power-down,
the group’s current position setting will be lost.
• If position is increasing as shaft rotates, the “on”
edge of the pulse will re-arm the terminal. If posi-
tion is decreasing as shaft rotates, the “off” edge
of the pulse will re-arm the terminal.
• Each program in the controller can have different
pulses in its output channels and corresponding
group channels.
• MOTION ANDING and OUTPUT ENABLE
ANDING can be used with outputs in a group op-
erating in mode 1.
Mode 1 Example Application
Three sections of an adjustable phase converting
machine are controlled by a single PL
µ
S controller and
resolver. Groups 1, 2 and 3 all operate in Mode 1. The
position of each group is reset to the “preset” value when
the group’s sensor detects the registration mark on the
shaft for the corresponding machine section. This keeps
the electrical control signals properly synchronized to
the mechanical devices in each section when phase
adjustments are made.
One resolver provides the position information needed
for all sections of the machine, regardless of their phase
relationship.
Mode 1 Programming 1. Program OUTPUT GROUPS to establish groups and modes.
2. Program the preset value for the group using GROUP OFFSET.
3. Jog the machine to the point where the group input terminal will energize. Using this
point as a reference, program pulses into the group’s output channels.
4. Program a pulse in the group channel.