PICO Toµch Controller
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VALVE Screen
The VALVE screen is used to change the operating mode, enter valve dispensing parameters, and control valve
power.
Button or Icon Description
MODE Sets the system operating mode.
Mode Description
Timed In the Timed mode, the valve cycles according to the settings for PULSE (valve open
time), CYCLE (time between deposits), and COUNT (number of deposits) for each
valve initiate signal.
Continuous In the Continuous mode, the valve cycles according to the settings for PULSE (valve
open time) and CYCLE (time between deposits) for as long as the valve initiate signal
is active, ignoring any setting for COUNT (number of deposits).
NOTE: If the system is latched on to a signal in the Continuous mode, you cannot
change screens.
External In the External mode, the controller operates as a slave to an input signal and thus no
longer generates the timing signals required to drive the valve. This mode is typically
used with a device such as the PICO 2+2-XCH-V3 controller for pattern generation.
NOTE: This selection is available only when SHOW VALVE EXTERNAL is toggled
ON via the SYSTEM screen. Refer to SHOW VALVE EXTERNAL under "SYSTEM
Screens" on page 26.
CAUTION
Because the controller does not generate timing signals in the external mode, take
care to not exceed the maximum operating parameters of the connected valve. In
addition, the time setting of any external signal used to drive the valve must be
greater than the RAMP OPEN prole time setting (refer to "WAVE PROFILE Screen"
on page 22). Exceeding timing and valve operational parameters can result in
overall loss of performance.
PULSE Sets how long the valve opens (in milliseconds).
Default: 10 (ms)
Range: Depends on the open prole time and the type of valve being used; as low as 100µs
possible
CYCLE Sets the amount of time between deposits (in milliseconds).
Default: 30 (ms)
Range: 2 (ms) to 9.9999 (s) typical (minimum setting depends on open and close prole times)
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