M&C TechGroup CSS Series Operator's manual - Manual (Page 31)

31
Gas sampling and gas conditioning technology 4-1.1-ME
17.3 SELF-OPTIMISING (PID-FUNCTION) OF THE CONTROLLED SYSTEM
The controller type 70304 has the possibility of a self-optimisation-function if it operates as a PID-
controller. In all M&C components this function is pre-adjusted. This means that a self-optimisation is
necessary starting up the component.
N O T E !
For self-optimising of the control circuit, the heating of the heated
sample line must be connected to the appropriate terminals of the
CSS (s. 10.1).
W A R N I N G !
Before connecting the heated sample line, isolate the unit from
the supply!
The self-optimising function can be activated as follows:

After cable connection (Figure 7), switch on the supply.

When the actual value (top display, red indicator)
reaches the setpoint value (bottom display, green indicator), press
 +  keys simultaneously
for longer than 2 seconds. The word ”tUnE” now flashes in the setpoint value display and the
self-optimising function is activated.

Self-optimization has finished when the display changes to the standard display. The time of
self-optimizing depends on the control circuit.
To cancel the self-optimization press the keys
 +  simultaneously.
The heated sample line now works in optimized operation.
18 CLOSING DOWN
N O T E !
Before stopping the CSS, sample gas should be expelled with
inert gas (Nitrogen or air).
The area in which the equipment is situated when not in use must
be kept free of frost at all times.
For stopping the CSS carry out the following steps:
 turn switch to ‘Pump off’ (LED red ); is not displayed on the control board in case of external control.

switch the CSS off; for local control turn the switch ‘On’ left (LED extinguishes)