Carlisle Ransburg DynaFlow 77376, Руководство по обслуживанию, Страница: 42 / 96

ERROR LOG (F11)
- Also See Section on Error Codes
Each ERROR CODE can represent a CHANNEL, GUN or
system error. See the Troubleshooting section for list of
error codes. It is possible for more than one code to be
issued at the same time.
The Interface Module stores ten (10) previous error codes
until they are read by the Local Operator Interface program
at which time they are automatically purged from its log.
The Local Operator Interface program stores one hundred
(100) previous error codes until they are manually cleared
by the operator. The operator may also save the error
codes to a floppy diskette for later analysis.
A PLC may obtain the current error conditions via RIO at
any time, but it must maintain its own log.
AUTOMATIC GUN
APPLICATIONS
Automatic applicators use automatic means to vary the
fluid flow through the use of transducers and material
regulators. When used with single-component materials
and an automatic spray applicator, the DynaFlow controller
regulates total material flow.
When used with two-component materials, the DynaFlow
controller regulates both the total fluid flow rates to the
applicator and the mixing ratios. Each CHANNEL of the
two-component material is programmed with predetermined
values.
The following conditions must be met in order for the GUN
to allow fluid flow:
1. There must be no system faults or GUN
faults active.
2. There must be valid GUN configurations.
3. The proper inputs must be supplied.
When a GUN is placed in the RUN MODE, the controller
sends a signal to the transducer to open
to the MVR LOW setting (default = 0 VDC). On the first
receipt of a trigger signal, the master channel immediately
starts its closed loop (PID) control and updates the infor-
mation to the transducer at a rate determined by the PID
Update Time (default = 30ms) to adjust the actual flow rate
to match the target flow.
At the same time, in a two-component system, the slave
channel (catalyst) also closes its PID control loop and
matches the actual flow rate to the target flow rate as
determined by the requested flow rate ratio of the Master
CHANNEL (resin) and slaved CHANNEL (catalyst).
Both channels run closed loop, independently of each other.
If either CHANNEL is not able to achieve the required target
flow rate, a FLOW TOO LOW or FLOW TOO HIGH fault
will be issued by the controller for the offending channel.
After an amount of material has passed through the Master
CHANNEL (set by the TOLERANCE VOLUME parameter),
the DynaFlow controller compares that volume with the vol-
ume of the catalyst that flowed during that volume interval.
If the ratio is outside of the tolerance as set by the FLOW
TOLERANCE parameter, the DynaFlow controller will issue
an OUT OF TOLERANCE fault for the offending GUN.
Dynamic Flow Rate Set Point Control
Dynamic Flow Rate Set Point Control is useful for chang-
ing flow rates of a material to achieve different coating
thickness over different areas of the same part. Several
examples are shown in the "Analog Control Settings chart"
in this section. In automatic GUN applications, the total
flow rate set point for the GUN may be varied in real time
using either of two methods; Remote I/O (RIO) or Analog
Input. If the RIO Set Point is zero and Analog Input Set
Point is less than 0.25 volts, the Total Flow Rate set point
comes from the JOB.
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OPERATION