Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 114)

Load Initial Configuration Values
Chapter 7
7-33
ATTENTION: A value of zero entered in your set-output
words does not necessarily correspond to zero pressure or flow.
If you configured for bi-directional valve operation (–10 to +10
Vdc), a set-output value of 50% gives zero volts signal output
(see graph) while a set-output value of 0% or 100% gives
maximum signal output. Amplifier electronics or spool-null
offsets may also allow pressure or flow at zero signal input.
Consult your valve and amplifier specifications for more details.
% Output Requested
Output V
oltage
-10
-8
-5
-3
0
3
5
8
10
0 10 20 30 40 50 60 70 80 90 100
For additional information, refer to Section 3 of the Plastic Molding
Module Reference Manual (publication 1771-6.5.88).
You may need ramp rates for smooth actuator motion. The QDC module
gives you multi-stepped profiles to reduce the need for ramp rates, so we
recommend starting with zero ramp rates. If you observe rough, jerky
motion during profile tuning in chapter 10, enter other values at that time.
ATTENTION: Using ramp rates may degrade closed-loop
control, ERC calculations, and QDC control capability. Use
ramp rates only if machine operation mandates them.
Set Your
Acceleration/Deceleration
Ramp Rates