M&C SP Series, Instruction Manual

Page: 36 / 59

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16.4.1 OPTION DRIVE UNIT 234B FOR THE SOLENOID VALVE UNITS
The drive unit 234B is used for control of the solenoid valves in the solenoid valve units for a clocked back purging.
The unit is mounted on a cap rail inside the FRP protection housing of the solenoid valve unit and is delivered
electrically connected.
16.4.1.1 Function and adjustment of the clock generator K3
The control of the back purge action is made via the electronic clock generator K3 (Typ CT-
MXS.22) that is equipped with 2 separate time adjustment possibilities for the impulse and
the pause duration. During the impulse duration, the probe is pack purged.
In the front of the clock generator are situated the adjustment possibilities for the time ranges
(Range) and the potentiometer for the fine adjustment (Time). Thus, any back purge and
pause durations can be separately adjusted. For the fine adjustment (Time) the scale is valid
which corresponds to the colour of the time range adjustment (Range).
Example:
The back purging shall be effected every 12 hours for totally 10 seconds.
Duration of the back purging: 10 s
Pause: 12 h
Adjustment „Duration of the back purging“ (10 s): Set the potentiometer (Time 2) to 10 (white
scale) and the time range (Range 2) to 10 s.
Adjustment „Pause“ (12 h): Set the time range (Range 1) to 30 h and the potentiometer (Time
1) to 12 (orange scale).
16.4.1.2 Function and adjustment of the clock generator K2
Via the clock generator K2 (EZ12TI), the solenoid valve Y2 (figure 15 and 16) for the feeding of back purge gas is
controlled. Here, you can adjust the lengths of the back purge impulses and the pause durations between the pack
purge impulses.
In the front of the clock generator
K2 the switch for the time basis T and the multiplicator xT1
and xT2 is situated. The duration of the back purging, eg. 1 s is set with xT1and the duration of
the pause between the back purge blows is set with xT2, eg 1 s.
Example:
Clock time and pause duration: 1 s
Adjust the time basis T at 0.5 s and the multiplicator xT1 and xT2 at 2.
(2 x 0.5 s = 1 s)