Carlisle Ransburg DynaFlow 77376, Руководство по обслуживанию, Страница: 57 / 96

16. Trigger the GUN. If the flow rate does not oscillate, or
the oscillations decrease in amplitude in a few seconds,
increase Kd by 30 and repeat from step 15. If the flow
rate oscillates with increasing amplitude, decrease Kd
by 15 and repeat from step 15. If the flow rate oscillates
with a constant amplitude, proceed to step 17.
17. Set Kd to one-eighth the present value.
18. Cycle the GUN from READY to RUN so the new
parameters are sent to the Channel Module(s).
19. At this point, the tuning procedure is completed. The
resulting Kp, Ki, and Kd parameters should produce
the fastest response with minimal over-shoot and/
or oscillation. If oscillation does occur with these PID
parameters,consider reducing each value by the same
percentage. This will lower the overall gain resulting in a
slightly longer time to achieve the desired set point and a
slower response to disturbances, such as paint pumps.
20. For two-component GUNs, repeat steps 4 through 19
for the Slave CHANNEL.
PID Tuning Methods - Alternate PID
1. Set the maximum set point for the GUN.
2. Set Ki and Kd parameters to zero. Do this for both
CHANNELS if this is a two-component GUN.
3. Set Kp for the Master CHANNEL based on the
following formula:
(8.0 - MVR LOW) * 25,500
Kp = 10
(Max. Gun Set Point * Ratio)
(Ratio + 1)
For example:
Max. Gun Set Point = 400 cc/min.
MVR LOW = 15 PSIG
Ratio = 3:1
(8.0 - 15) * 25,500
Kp = 10
(400 * 3)
( 4 )
= 6.5 * 25,500
300
= 552.5
= 550
4. Set Kp for the Slave CHANNEL based on the
following formula:
(8.0 - MVR LOW) * 25,500
Kp = 10
(Max. Gun Set Point)
(Ratio +1)
For example:
Max. Gun Set Point = 400 cc/min.
MVR LOW = 15 PSIG
Ratio = 3:1
(8.0 - 15) * 25,500
Kp = 10
(400)
( 4 )
= 6.5 * 25,500
100
= 1657.5
= 1660
5. Cycle the GUN from READY to RUN so the new
parameters are sent to the Channel Module(s).
6. Trigger the GUN. If the flow rates do not achieve their
individual CHANNEL set points, adjust the upstream
fluid pressures until they both are on target.
NOTE
†
This may require repeated triggers and fault
resetting. Once the proper fluid pressures are set,
the maximum set point for the gun will be flowing,
ratioed properly between the CHANNELS, with the
MVR pressures at 80 PSIG.
7. Set the Ki parameters for both channels to a value between
50 and 500 in order to bring each CHANNEL to its exact
set point. Be sure to cycle the GUN between READY and
RUN to send the Ki values to the Channel Modules.
8. Normally, Kd may remain at zero. Set Kd to a value
between 50 and 500 if there appears to be a delay in
the response.
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PARTS IDENTIFICATION