PICO Toµch Controller
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Clearing Alarms
When an alarm occurs, the screen title bar blinks red and an alarm
window appears. The window indicates the alarm type. System alarms
include:
Alarm Cause
No Valve Detected System cannot detect a valid valve connected to the
controller.
Stack Over
Temperature
System operating beyond its acceptable range;
typically caused by high frequency operation.
Piezo Driver FAULT Error occurred with the piezo driver circuitry.
NOTE: Press MORE DETAILS to obtain specic
information about the cause of this alarm.
Pulse Time Adjusted Parameters entered for RAMP do not coincide with
PULSE and CYCLE times; OR, if running in External
mode, dispense timing parameters are violated.
Driver Shut Off Piezo driver unexpectedly shut off and the system
recovered; typically caused by improper use or
installation.
Valve Communications
Error
Controller experiencing valve communication issues;
typically caused by a faulty physical connection.
LCD Fault Problem occurred with LCD display.
Heater Fault Heater failed or shorted RTD in the valve.
When an alarm occurs:
1. Clear the alarm. Alarms can be cleared in two ways:
• Locally at the controller by pressing OK (check).
• Remotely through pin 6 (Error Reset) of the I/O 1 (input / output)
connector. Refer to "Input / Output Port Pin Descriptions" on
page 46 to connect inputs / outputs.
2. If needed, correct the problem that caused the alarm. Refer to
"Troubleshooting" on page 44 for additional troubleshooting
information.
Routine Shutdown
1. Stop the process.
2. De-pressurize the system.
WARNING
Risk of burns. Wear heat-protective gloves when working with a heated
valve.
3. If the valve is heated, switch OFF heater control.
4. Refer to the valve manual to perform any of the following
procedures as appropriate for the uid:
• Removing the uid body assembly.
• Purging the valve with the process uid.
• Purging the valve with cleaning uid.
• Cleaning the valve uid paths.
Operation (continued)
Clearing an alarm
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