Output Impulses - Nordson EFD PICO Controller 2+2 CH-V2 Series Operating Manual

Output Impulses

Each channel has its own section in the program memory. A program for a dispensing sequence consists of 1 to 99
lines. The lines and blocks are compiled with a text editor for each channel on a PC as a .txt file. They are buffered
on an SD card and then loaded into the memory of the PICO controller. A pulse-pause block is started with input
signals IN1 to IN10 or manually via the operating menu.
Pulse Pause Lines
A pulse-pause line consists of 1 to 999 identical cycles (repetitions). A cycle is made up of one pulse duration and
one pause duration.
A dispensing time can be 0 or at least 0.05 ms. With a dispensing time of 0 ms, a constant or variable delay
can precede a dispensing sequence. This is done by entering the respective numerical value or a "v" in the
corresponding line in the "Pause time" field in the control program.
The pause time between two dispensing pulses should be at least 0.12 ms.
A continuous signal (continuous dispensing) can be programmed when the pause time is 0 ms. This enables an
uninterrupted line or a bead to be applied.
The general course of a pulse-pause line is shown in the following illustration. The variables for a pulse-pause line (=
"line") are dispensing time, pause time, and number of pulses. To make fine adjustments easier, the cycle is set (at
the unit) instead of the pause time. The pulse height is a steady +24 VDC; it cannot be modified.
A line can be activated individually or can be linked to a block.
Amplitude (V)
Cycle = Dosing Time + Pause Time
Dosing Time =
Pulse Time
Start of the line / row
Figure 1: General momentum diagram for a pulse-pause-line
Up to 99 different pulse-pause lines can be stored in the program memory of the PICO controller. A line is started
with a binary input signal, IN1 to IN10, passively by linking it to a previous line or by activating through the Manual
Mode menu option.
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Pause Time
(a line consists of 1 to 999 pulse-pause cycles)
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PICO Controller 2+2-XCH-V2
Start of a new
pulse interval
cycle
Time (t)
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