SICK FFU Bedienungsanleitung Seite 41

EN
5 Operation
FFU Operating instructions
Example 2: FFU pnp-out connected to a counter
Connecting output 2 to external counter
Setting area: off, pulse output, empty pipe, lower limit, upper limit, negative flow
Media
FFU dispose of a medium matrix with up to 8 interpolation values. Different medias can be managed
in the sub menu "Media". Matrix values can be saved and if needed be loaded for different medias.
Digital input IN1
FFÜ has a digital input that is programmable to following functions: dosing input, set offset, creeping
suppression inactive and reset counter. In order to start a dosing process, wiring to 24V DC is requi-
red. The condition is the configuration of the dosing parameters with the user display.
Dosing input is debounced so that re-start is not possible during a running dosing process. After
changing configurations a restart of the device is needed to activate the function.
Dosing can basically be realized in two ways:
1. FFU as dosing device (dosing control FFU)
FFU does the entire dosing control. The dosing quantity (e.g. 400 ml) is pre-set in the FFU using
the user menu of the display. Dosing starts, as soon as line digital input is wired to 24 V, e.g. via a
pushbutton. FFU will now open the dosing valve via the output configured for it. When the pre-set
dosing quantity is reached, the dosing valve is closed via the above output. The dosing procedure can
also be started and stopped by using the dosing user menu. The 2nd output can be used indepen-
dently for signaling of empty pipe detection, limit control or flow direction.
The following settings are necessary:
Adjustment of dosage in the menu
Dosing → Dosing quantity → 400 ml
Setting the max. dosing time that should be allowed for safety reasons.
Digital Input I1 → Dosing
Digital Output Q1/Q2 → Function → Dosing
2. FFU as flow meter (dosing control via dosing equipment)
The dosing equipment is responsible for the entire dosing control. Therefore, the dosing quantity is
fixed in the dosing equipment control during commissioning by pre-selecting the meter pulses. Dosing
starts, when the relevant pushbutton of the dosing equipment is pushed. The control will now open
the dosing valve. From now on FFU will send a voltage pulse to the control for each volume unit that
has flown through (e.g. per 1ml). When the pre-selected pulse quantity is reached, the control closes
the dosing valve. In this case, output Q1/Q2 is used to send out pulses.
8013863/2012-02-10 © SICK AG • Fluid sensors • Germany • Subject to change without notice
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