535-PROF User's Manual
Chapter 7
95
Applications
E. SLIDEWIRE POSITION PROPORTIONING
CONTROL
Slidewire position proportioning utilizes a slidewire feedback signal
to determine the actual position of the actuator being controlled.
Hardware Configuration
•
The controller
must
have the Slidewire Feedback option installed. Refer
to the order code in Chapter 1 for more information.
•
The controller must have mechanical relays, solid state relays or DC logic
modules installed in the first two output sockets.
•
The Slidewire does NOT have to be wired to the controller in order to set up
position proportioning.
Software Configuration
1. To configure the controller before wiring the slidewire feedback signal to the
controller, complete these steps:
a. Go to the
CONTROL
menu.
b. Set a value for
PV BREAK
c. Go to the
SPECIAL
menu.
d. Set a value for
DES. OUTPT.
e. Set a value for
PWR.UP:OUT.
f. Go to
SER. COMM.
menu.
g. Set a value for
SHED OUT.
2. Place the controller under manual control.
3. Go to the
CONFIG.
menu.
4. Set
CTRL. TYPE
to POS. PROP (position proportioning).
5. Set
P.P. TYPE
to SLIDEWIRE.
6. Go to the
CONTROL
menu.
7. For
S/W RANGE
, specify the full range resistance of the slidewire from end-
to-end. With a 100 ohm slidewire, this parameter should be set to 100.
8. Scroll to
OPEN F/B
(Open feedback). Enter the ohm value when the actua-
tor is fully open (0 to 1050 ohms).
9. Scroll to
CLOSE F/B
(Closed feedback). Enter the ohm value when the ac-
tuator is fully closed (0 to 1050 ohms).
10. Measure the actual slidewire value at the terminals (10 and 11).
As an alternative, set up these two parameters dynamically. Before enter-
ing Set Up set the manual output at 100%. Enter Set Up and change the
OPEN F/B
value until the actuator just reaches its full open position.
Exit Set Up and set the manual output to 0%. Enter configuration and change
the
CLOSE F/B
value until the actuator just reaches its full closed position.
11. Set the parameter
P. PROP. D.B.
, which is used to eliminate cycling of the
motor. A low deadband setting may result in motor overspin or cycling. A
high deadband will result in reduction of sensitivity. To set:
a. Go to the
TUNING
menu.
b. Set
P. PROP. D.B.
to .5%.
c. Place controller under Manual control.
NOTE: OPEN F/B
and
CLOSE F/B
values are always reference to the
CCW end of the Slidewire.
CAUTION!
The relay in socket 1 drives the motor
counterclockwise and the relay in
output socket 2 drives the motor
clockwise.
This is important for:
•
Wiring the outputs
•
Selecting the control
ACTION:1
parameter, or
•
Determining the normally open or
normally closed relays,
The configuration choices influence
the way the position proportioning
algorithm works.
