Gemu 1436 cPos - Commissioning; Initial commissioning without factory setting; Automatic initialisation; Manual initialisation

14 / 66
1436 cPos
9 Commissioning
If the GEMÜ 1436 cPos is delivered fully mounted
to a valve ex works, it is already preset at the
factory (at a control pressure of 5.5 - 6 bar without
operating pressure) and is therefore ready for
operation. A reinitialisation (see chapter 9.2.1)
is recommended if the plant is operated with a
dierent control pressure or if the mechanical
end positions have been changed (e.g. seal
replacement on the valve or actuator replacement).
1. Turn on the pneumatic control air supply (observe maxi-
mum control pressure for the positioner and the valve!).
2. Switch on the 24V DC power supply [plug X1, pin 1 (+) and
pin 3 (-)].
3. Specify an analogue set value 0/4-20 mA.
4. Specify an analogue actual value (only when operating as a
process controller) 0/4-20 mA.
9.1 General information
DANGER
Exhaust air and cycle duties generate noise!
P Hearing damage.
● Wear hearing protection.
In order to be able to make changes to settings and
parameters for the GEMÜ 1436 cPos no parts of
the housing need be taken apart or opened!
All parameter settings and the initialisation are
retained even in the event of voltage cuto.
9.2 Initial commissioning without factory setting
(whensuppliedwithoutavalve)
It may be necessary to close the internal positioner
throttles a little (V1 and V2 for single acting
actuators and V1, V2, V3 and V4 for double acting
actuators) if the actuator volume is very low in
order to increase the valve operating time. This
can be done during initialisation in "adjTime". A
modication to the throttle setting independent of
initialisation may lead to error messages and/or
poor control results. It is therefore recommended
to carry out initialisation again after every throttle
change.
Experience has shown that valve operating times of
about 1-2 seconds lead to optimal control results.
It may not be possible to reach this operating time
range for large-volume actuators.
For valves with control function 8 (double acting
with opening spring), for which automatic control
function recognition has not worked, the parameter
"CtrlFn" must be converted to "DNO" in the manual
initialisation sequence.
After assembly and all electrical and pneumatic connections,
the positioner must be initialised.
While doing this, it is possible to choose between automatic
initialisation and manual initialisation.
When connecting the supply voltage, the following message is
displayed by GEMÜ 1436 cPos after it has completed a short
software check:
NoInit XX.X%
Use the
+
and
ـ
keys to open and close the valve.
9.2.1 Automatic initialisation
Tip for use:
During automatic initialisation of actuators whose
travel is not continuous (i.e. with undened stops,
e.g. with large size buttery valves) the end
positions cannot be clearly detected.
In this case manual initialisation by the operator
with sequential movement through the menu (see
chapter 9.2.2) should be used.
Automatic initialisation can also be carried out by
quick commissioning (see Quick Commissioning
on page 2 of the GEMÜ 1436 cPos).
The positioner adapts to the valve when automatic initialisation
is started. All parameters are automatically scanned.
This procedure can take a few minutes, dependent on the
valve.
● Prior to commissioning, familiarise yourself with the
operation of the GEMÜ 1436 cPos (see chapter 7).
● For automatic initialisation proceed as described on the next
page.
9.2.2 Manual initialisation
When manual initialisation is started, the positioner runs
through an initialisation program that is similar to the automatic
initialisation. However the dierent program steps for the
manual initialisation must be started and conrmed by the
operator using the
+
key.
● Manual initialisation should only be used if the automatic
initialisation does not achieve satisfactory control features or
in case of leakage problems.
● The menu items goClose and goOpen should be carried
out several times for very small valve strokes in order to
ensure an optimum adaptation of the positioner to the valve.
● Emergency operation of the automatic control system is
possible, if at least the goClose and goOpen menu items
are carried out.
● In order to prevent incorrect operation, the parameters from
manual initialisation are only accepted when they comply
with the requirements for correct function.
● Prior to commissioning, familiarise yourself with the
operation of the GEMÜ 1436 cPos (see chapter 7).
● For manual initialisation proceed as described on the next
page.