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15 Commissioning
15.3 Setting the throttle screws
For all designs:
V2
V1
3
V5
Single acting
Throttle screw V1 regulates the flow rate flowing out of work-
ing connection 2 toward the connected process valve actu-
ator.
Throttle screw V2 regulates the flow rate flowing back from
the process valve actuator connected to working connection
2 toward venting connection 3 (silencer).
Function and adjustment of the throttles
The flow rate and thereby the speed are reduced/throttled by
screwing in clockwise. Opening anticlockwise increases the
flow rate. In both directions, a mechanical stop marks the
max. setting.
Screwed all the way in = 100% throttle effect and thereby low-
est air flow.
The throttle settings should only be changed during initializa-
tion in the AdjustTime step. In this step, the currently meas-
ured travel times for both directions (open/close) are dis-
played next to one another for around 5 seconds. If these
times do not meet expectations, the initialization process
must be paused by pressing the
out throttle adjustment. If the key is not pressed, the initializa-
tion process is automatically continued after around 5
seconds – if necessary even if the travel times are unfavour-
able. The process can, provided that the travel times are ac-
ceptable, also be continued directly by pressing the
key.
The throttles should be set in such a way that a constant
travel profile is achieved at the desired speeds. Travel times
of <1.0 seconds are not generally recommended. Experience
has shown that travel times in the range between 1...2
seconds lead to optimal control results. The times for the two
directions should ideally coincide (< ± 50 %).
If the throttles are adjusted during operation, a new initializa-
tion should be carried out so that the device can perform an
updated self-calibration with any conditions that have
changed. Otherwise this could result in negative control res-
ults and incorrect error messages.
GEMÜ 1436 cPos
= Supply air
(compressed air)/
working connection 2
= Exhaust air
working connection 2
Wait key in order to carry
Next
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Additionally for double-acting design:
V3
V2
V1
V4
3
V5
Double acting
V3 regulates the flow rate flowing back from the process
valve actuator connected to working connection 4 toward
venting connection 3 (silencer).
V4 regulates the flow rate flowing out of working connection
4 toward the connected process valve actuator.
15.3.1 Travel time measurement during initialization
The determined travel time of the valve for both directions
(open/close) is displayed. To change the travel time, this step
can be interrupted by pressing a key ("adjust nozzle(s)" dis-
play) and influenced via the pneumatic throttle screws at the
rear. Fine adjustment is carried out by repeating the travel
time measurement several times and sequentially changing
the throttle position. If values of <1.0 second are displayed, it
is strongly advisable to use the throttles. Travel times of >1.0
second are recommended in order to achieve optimal control
results. (see "Setting the throttle screws", page 38)
= Supply air
(compressed air)/
working connection 2
= Exhaust air
working connection 2
= Supply air
(compressed air)/
working connection 4
= Exhaust air
working connection 4
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