Graco 234129, Инструкция по эксплуатации, Страница: 60 / 108

Frequently Asked Questions
60 309738L
Q:
Why is my calibration failing after only a few seconds?
A:
You may not have been able to reach the maximum flow rate or maximum pressure you entered. To reach a
higher flow rate or pressure, you can increase the feed pressure or increase the dispense valve nozzle size.
Q:
Why will my dispense valve not operate?
A:
The valve will not dispense in Bead Control Mode until a valid calibration has been performed. Try switching to
volume monitor or pressure control mode or calibrate again.
Q:
Does Volume Monitor Mode use a flow meter?
A:
Running in Volume Monitor Mode requires a flow meter to monitor the job volume limits or job log volumes. If
you do not have a flow meter set the system to the pressure control mode.
Q:
How do I know my flow and volume measurements are accurate?
A:
Calibrate the flow meter as instructed on page 104. This is strongly recommended as many sealants are com-
pressible, and the flow meter measures the fluid while it is under pressure. Calibrating the meter makes it accu-
rate for your fluid at ambient pressure. Periodic calibration is also important to monitor your meter for wear.
Q:
I have flow, but how do I know if my fluid regulator is working?
A:
If a fluid regulator fails it can no longer hold back fluid pressure. If the outlet pressure climbs up to equalize with
the inlet pressure when you stop dispensing, the regulator has lost the ability to shutoff or fully regulate flow. If
you have pressure limits set you will get a
High Outlet Pressure alarm. If you have job volume limits set you will
get a High Volume On Last Job alarm .
Q:
Is there a way to put the fluid plate control regulator in a bypass mode to still operate the dis-
pense valve when I have a problem?
A:
With the air operated regulators you can move the air tube that feeds the V/P valve directly to the fluid regulator
air inlet. Turn off the air supply before moving tubes.
Q:
How do I download job logs or alarm logs from the PrecisionFlo LT control?
A:
There is an external phone-style connection on the right side of the control enclosure. You need a PC or laptop
computer with terminal emulation software and part number 233657 accessory cable kit. See
Communicating
with PrecisionFlo LT , page 40.
Q:
Will I lose any of my Setup parameters or logged information if power is lost?
A:
No. All setup parameters, job logs, and alarm logs are saved to flash memory and do not need any power. This
is non-volatile memory similar to the cards used with digital cameras. There also is no battery to replace. The
setup parameters are stored to flash memory when the key switch is moved from the setup to the run position.
Q:
Can I cause an error or system problem while looking at screens when production is running?
A:
If the key switch is turned counter clockwise or removed, which means the system is in Run mode, you can view
the run screen but you cannot change any parameters except Bead Scale when enabled. You can still select
Manual or Automatic mode on the user interface which would stop the automation initiated dispensing.