Electro Cam PL-1746 Series - Manual (Page 10)

1-5 Introduction
PL-1746 Additional Features
Scale Factor The user can program the number of increments per revolution, or “Scale Factor.” For
example, to make the controller display position in degrees, a Scale Factor of 360 is
used. For some applications, Scale Factor may be set to define increments in terms of
linear distance, such as one increment equals 0.1" of travel. The PL-1746 module has
a maximum of 4096 increments per revolution.
Programming Access Three levels of programming access are provided: Operator, Setup, and Master. Each
level can be assigned a password that must be entered to allow programming at that
level. In addition, the Operator and Master levels can be activated on an individual
keypad through hardware terminals on the back. Careful use of programming access
levels can provide key personnel the flexibility they need in programming the controller,
while protecting settings against accidental or unauthorized changes.
Speed Compensation Speed compensation advances the pulses in an output channel as machine speed
increases. This eliminates the need to manually adjust the pulses for fixed-response
devices when machine speeds are changed. Speed compensation provides greater
accuracy, higher production speeds, and reduced downtime for machine adjustment.
See Chapter 5 for details.
Motion ANDing Two speed ranges can be programmed into the controller, and outputs can be ANDed
with either speed range so that they will be disabled unless the machine speed is within
the range. A common use for this feature is disabling outputs to glue valves to turn off
glue flow if the machine stops.
Timed Outputs Timed outputs are programmed like standard channels to turn on and off at specific
points of resolver rotation. However, once a timed output is on, it will remain on for a
specified time period, regardless of RPM. If the programmed “off” position is reached
before the time period passes, the output will turn off. Timed outputs are used to drive
devices such as pneumatic cylinders which require a fixed time to perform a task, re-
gardless of machine speed.
Analog Outputs PL-1746-C01 controllers can drive two analog output modules whose output signals
will be linearly proportional to RPM. The analog signal level at zero RPM can be pro-
grammed, as well as the RPM that corresponds to maximum signal. No measuring
equipment is required for initial setup, and calibration is not needed. Typical uses for
the analog output are to control glue pressure as machine speeds change, or to match
speeds of other equipment to the machine being controlled by the PL-1746.
Positions & Offsets The illustration below indicates how resolver, machine, and group positions & offsets
are computed.
+ +
Raw Resolver Position
(R/D Converter Output)
Accounting
for Direction
of Rotation
and Scale
Factor
Resolver
Position Machine
Position Group X
Position
Machine Offset Group X Offset