PMV P-2000 User manual

– 1 – Manual
P-2000 P-2020
P-2000 Ex
P-2020 Ex
P-2050
Manual

Manual
– 2 –
Contents
Function 5
Air preparation 6
Installation 6
1. Calibration
1.1 Cam setting 7
1.2 To change the action 7
1.3 Gain adjustment 7
1.3.1 To reduce the gain 8
1.4 Zero adjustment 8
1.5 Range adjustment Maintenance 8
2.1 The restriction plug 8
2.2 To clean the valve body 8-9
2.3 To replace the diaphragms 9-10
Trouble shooting
11
Ex installation 12-13
Exploded drawing 14
Dimensional drawing 15
Page

– 3 – Manual
Manufacturers declaration • Hersteller-Erklärung • Déclaration de fabricant
GB
Manufacturers declaration
in compliance with EC directive 89/392/EEC/89/336/EEC, & 92/31/EEC
We hereby conrm that the appliances described in this sheet has been manufactured in compliance
with the applicable standards and is intended for installation in a machine/application, and that com-
missioning is strictly prohibited until evidence has been provided that the machine/application
in question is also in compliance with
EC directive 89/392/EEC/89/336/EEC, and 92/3/EEC.
This manufacturers declaration is applicable to the following PMV series:
P-2000/P-2020/P-2050/P-2000Ex/P-2020Ex
D
Hersteller-Erklärung
im Sinne der EG-Richtlinie 89/392/EWG/89/336/EWG, & 92/31/EWG
Hiermit erklären wir, daß die in diesem Blatt beschriebenen Geräte entsprechend den gültigen Normen
gebaut und zum Einbau in eine Maschine oder Applikation bestimmt sind, sowie daß deren Inbetrieb-
nahme so lange untersagt ist, bis festgestellt wurde, daß diese
Maschine/Applikation ebenfalls der EG-Richtlinie
89/392/EWG/89/336/EWG, 92/3/EWG entspricht.
Diese Herstellererklärung hat für folgende PMV-Serien Gültigkeit:
P-2000/P-2020/P-2050/P-2000Ex/P-2020Ex
F
Déclaration de fabricant
au sens dela directive de la 89/392/CEE/89/336/CEE, & 92/31/CEE.
Nous déclarons par la présente que les appareils décrits sur cette page sont construits en conformité
avec les normes en vigueur et qu'ils sont destinés à être montés dans une machine ou une application,
nous déclarons également que leur mise en service est interdite tant qu'il n'a pas été constaté que cette
macine/application satisfait
également à la directive 89/392/EEC/89/336/EEC, 92/3/EEC.
Cette déclaration de fournisseur est valable pour les types d'appareils PMV suivants:
P-2000/P-2020/P-2050/P-2000Ex/P-2020Ex
Mr. Jan-Eric Andersson
President, Palmstiernas Instrument AB

Manual
– 4 –
.
PMV Positioner storage and handling procedures
PMV Positioners are precision instruments which should be stored and hand-
led accordingly to avoid problems or damage.
Appropriate precautions should be taken to protect units while in storage.
Warehouse storage
Stored in original PMV shipping containers, units should be stored in an en-
vironmentally controlled area, i.e. clean, cool (15-26°C, 6-80°F) and dry, out
of direct sunlight or weather exposure.
Field storage
Note: Once air supply to the positioner is connected and turned on, internal
air bleed will prevent the ingress of moisture and protect the unit from cor-
rosion. It is recommended that the air supply be left on at all times.
• If units are installed immediately, tum, and leave on, the air supply.
• If positioner must be stored outdoors, tighten all covers which may loosened
in shipment, make sure all open enclosure entry points are sealed.
Positioners should be wrapped and sealed air and watertight with desiccant
inside the plastic, units should be securely covered with an opaque cover and
not exposed to direct sunlight, rain or snow.
Potential damage mechanism
When units are stored in hot, humid climates, the daily heating/cooling cycle
will cause air to expand/ contract and be drawn in and out of the positioner
housing.
Dependent on the local temperature variations, humidity, dew points and
the time in storage condensation could occur and accumulate inside causing
erractic operation or failure due to water or corrosion. The potential for con-
densation damage is especially high in southern climates and aggravated if
units are exposed to direct sunlight.
For further assistance, please contact your nearest PMV ofce.

– 5 – Manual
Function
.
The PMV E/P Positioner function is based on torque
balance. Direct current, 4-20 mA or 0-20 mA acting as
input signal creates, in the force coil (53) in the per-
manent magnet (50) eld, a force proportional to the
signal and, on the beam (92), a corresponding torque
The position of the cylinder (C) piston is converted
by means of the feedback linkage (L), cam (42), lower
arm (21) and spring (40), to a force proportional to the
position of the cylinder (C) piston and, on the beam
(92) a counter torque. When in balance, the cylinder
position equals the input signal value.
The nozzle (114) without friction senses the balance of
the beam (92). When, for example, the signal is increased
thetorquecorrespondingto thesignal onthe beam (92)
will increase and the beam (92) will turn clock-wise.
The nozzle (114) closes, and the nozzle pressure in-
creases. The diaphragm assembly moves downwards
as does the spool (68) of the pilot valve activated by the
balancearm (57). Supply airows through connection
C2 andairfrom the ”minus” chamberofthe cylinder(L)
is exhausted through connection C1.
Differential pressure is created in the cylinder, and the
piston will travel ”plus” until the torque change on
the beam (92), created by the piston position change,
rebalances the beam (92) positionand the nozzle pres-
sure. The diaphragm assembly will return to equili-
brium position with the balance arm (57) guiding the
spool (68) to mid position. The piston of the cylinder
(C) will stop in the position corresponding to the new
input signal.
A change in position ofthe balance arm (57) creates,
through the spring (93), anegative feedback torque on
the beam (92). Stable operationis thus achievedin spite
of possible great static amplication or sensitivity. The
position of the spring (93) can be changed along the
beam (92) and the balance arm (57) in order to adjust
positioner gain, and thus the dynamics of the positioner.
The positioner can be adjusted to match any small or
large actuator.
The lower arm (21) has a mechanism for zero adjust-
ments. The beam (92) has the mechanism for adjusting
the range. To reverse the positioner action the cam (42)
is ipped over and the pipe cormections C1 and C2
are interchanged.
Splitrangeisavailablebychoosingtherightcurveonthe
cam (42). Non-linear function is achieved by reshaping
the cam (42). Such cams are available from PMV.
The PMV E/P Positioner can also be used as a single
acting positioner by simply plugging one of the
ports C1 or C2.

Manual
– 6 –
Air preparation
The PMV ELECTRO-PNEUMATIC Positioner
can work with supply pressure up to 8 bar ( 120
Psi”). In order to obtain a satisfactory operation
and high reliability a lter (25 microns) should be
placed as close to the Positioner as possible.
For larger pressure variations of the supply air
(or the supply pressure is too high) a pressure
regulator should be mounted next to the lter in
order to eliminate the uctuations. The supply
air must be dry, clean and free from oil.
Installation
The PMV E/P Positioner is available with a large
selection of feed back spindle designs to simplify
the mounting on the actuator.
Ports C I and C2 are to be connected to the ac-
tuator.
Port S is to be connected to the air supply (max
8 bar or 120 psi3 which should be of instrument
quality (clean, dry and oil free). If your supply
pressure is too high and/or the supply pressure
changes from time to time you must use a pres-
sure regulator.
Port I is to be used for the electrical connection
gland. This connection is 1/2~ NPT or PG 13.5
(M- 20) internal thread.
Input signal: 4-20 mA; 0-20 mA
Input resistance: 240 Ohm±10%
Important notice
The PMV Positioner with the cover (33) and the side frame
(3) dismounted.
P-2000 Ex/P-2020 Ex should be connected to
intrinsically safe circuits only. See installation
dwg for further details.

– 7 – Manual
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
1. Calibration
PLEASE NOTICE: For easy
acsess to important parts
please back off the four screws.
Remove the cover.
Fig 1
The side frame can be removed
bysimplypressingoutoneend
of the frame from the slot in
the main frame.
Fig 2
NOTE: P-2000 series positio-
ner are factory calibrated to
4-20 mA input signal. Start
by adjusting zero rst, then
stroke the unit and check
reading before further ad-
justments.
1.1 Cam setting
After mounting the PMV
Positioner on your actuator
and before switching on the
supply air, if possible, ma-
nually operate the actuator
from fully open to fully clo-
sed position and check that
the cam is correctly oriented.
Make adjustments if necces-
sary (see instructions below).
Should manual operation of
theactuatornotbepossiblewe
recommend you to back off the
nut holding the cam.
Fig 3
Adjust the position of the cam
so that the ball bearing on the
lower arm rests on the lowest
part on the correct curve of
the cam. You have three dif-
ferent curves to choose from
on the standard cam (0-100,
0-50 or 50-100 % of the control
signal for the full stroke of the
actuator).
Positionthecamasshown.The
ball bearing should not ride
on the inactive portion of the
cam. Tighten the nut.
Fig 4
NOTE: The cam will turn
slightly with the nut as it is
tightened. Be sure to allow for
this slight clockwise rotation.
1.2 To change the action
To change the action, the cam
must be ipped over and the
tubes to the connections C1
and C2 must change places.
Fig 5
1.3 Gain adjustment
PLEASE NOTE: Before adjus-
ting the gain please switch of
the supply pressure.
The gain surpression spring
can be moved along the beam
and the balance arm. The
feedback stiffness can thus
be adjusted so that the PMV
Positioner dynanics matches
the actuator size.
Fig 6&7
You will nd a number of posi-
tioning holes in the beam and
the balance arm for the spring.
The smaller the actuator the
lower is the acceptable level
of the gain.
High gain
Low gain

Manual
– 8 –
Figure 8
Figure 9
Figure 11
Figure 12
Figure 13
Figure 14
1.3.1 To reduce the gain
Move the spring to the left.
Please use a pair of tweezers
when moving the spring.
Fig 8
Changing the position of the
spring effects the zero adjust-
mentandnewzeroadjustment
is neccessary (see 1.4 below).
1.4 Zero adjustment
Set the input signal at 4 mA
(or 0 mA for 0-20 mA control
range) and switch on the air
supply.
When turning the zero setting
screw to the right the actuator
will move in the direction of
the decreasing signal. Adjust
the screw until the actuator is
in the ”starting” position.
Fig 9
1.5 Range adjustment
Set the input signal at its nal
value e.g. 20 mA.
If the turning angle of the
actuator is too large (small) a
downwards (upwards) rota-
tion of the range adjustment
screw will reduce (increase)
the actuator travel.
Fig 10
The range and zero adjust-
ments has a small effect on
one and other. Therefore a
few zero and range adjust-
ments might be needed in
turns.
PLEASE NOTICE: Should tbe
zeroadjustmentreachthelimit
you might be helped by using
the other spring mounting on
the spring guide. Use a pair of
tweezers to change the posi-
tion of the spring.
Fig 11
2. Maintenance
The permanent magnet has
a very strong magnetic eld
andin order toavoidirondust
entering into the narrow gap
for the force coil you should
never leave the PMV E/P
Positioner without the cover
mounted.
Regular maintenance of the
PMV E/P Positioner is not
required. The need for main-
tenance is depending on your
supplyair quality.Shouldiron
dust enter into the magnet,
restricting the free movement
of the force coil , this would
cause distur-bances.
2.1 The restriction plug
Close to the connection (S)
for the supply air you will
find the restriction plug
which is easily removable
for exchange. Before repla-
cingtherestrictorplugplease
check that the Orings are in
good condition.
Fig 12
2.2 To clean the vahe body
Unscrew the four screws and
and remove the cover.
Fig 13
Remove the side frame.
Fig 14
Figure 10

– 9 – Manual
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22
Figure 15
Removethescrew(30)andthe
indicator.
Fig 15
Remove the nut and the cam.
Fig 16
Remove the three screws hol-
ding the valve body.
Be careful not to damage the
Magnet unit.
Fig 17
Carefully remove the valve
body. Handle so that the spool
slideseasilyanddoes notbind
against the tip of the balance
arm.
Fig 18
Pull the spool out of the valve body.
Wash the components in a solvent using e.g. a pipe-
cleaner for the valve body and blow the internal of the
valve body clean and dry using compressed air.
Partsshouldbehandledwith caution.Spoolandvalve
body are matched together and can not be changed
separately.
The spool should move freely in the valve body and
with the spool oriented in the ”closed position” the
play between the spool and the valve body seats
should be fairly tight. Should it be possible to move
the spool in the radius direction due to wear or if the
spool cannot be moved freely along its axes the valve
body with the spool must be exchanged.
Before retting the valve body and spool check that
the O-rings are mounted and in good condition. Take
care not to damage the leaf springs on the tip of the
balance arm. Both leaf springs must be in the gap of
the spool. Using a small screw driver to atten the leaf
springs will help you slide the spool in place.
Fit the screws and tighthen the screws a little at a
time.
Fig 19
2.3 To replace the diaphragms
Back off the four screws and
remove the cover. See g 13.
Remove the sideframe. See
fig 14. Remove the screw
and the indicator . See g 15.
Remove the nut and the cam.
See g 16.
Disconnect the control signal
wires.
Fig 20
Use a pair of plairs to unload
the tension of the spring by
lifting the end of the spring
over the screw.
Fig 21
Remove the screws and
the valve body. See g 17
and 18.
Remove the screws.
Fig 22

Manual
– 10 –
Figure 24
Figure 25
Figure 26
Figure 23
Carefully lift out the E/P
converter.
Fig 23
Remove the gain supres-
sion spring by using a pair of
tweezers.
Fig 24
Loosen the screw and be care-
ful to use a holding-up tool for
the retainer to avoid tension
on the diaphragms.
Fig 25
Pull the diaphragm-piston
assembly upwards apart from
the middle section.
Fig 27
The middle section can
now be separated from the
body.
Figure 27
Replace the broken diaphragm and assembly the
positioner step by step following the opposite order
in which you now have disassembled it.
Be sure to check that all O-rings are in good condition
and in the proper places.

– 11 – Manual
Signal change has no effect on the actuator position.
– Make sure the supply pressure is switched on.
– Signal wires are wrongly connected.
– The wiring between the terminal block and the printed circuit board on
the force coil is broken. Check resistance.
– Pipe connections between the PMV Positioner and the actuator is wrong.
– A wrong portion of the cam is being used.
With a small change in the control signal the actuator runs to the end po-
sition.
– Pipe connections between the PMV Positioner and the actuator is wrong.
Inaccurate positiomng
– Dirty valve body.
– Dirty restrictor or nozzle.
– Iron dust in the magnet gap.
– Defective diaphragms.
– The sizing of the actuator is incorrect. Output torque of the actuator is too
small or the supply pressure is too low.
– Torque requirement of the valve has increased.
Overshoot or hunting during positioning.
– Internal gain is too high.
– Capacity of the supply pipe is too small or air lter is clogged. In this
event the input pressure to the PMV Positioner drops steeply when
the pilot valve feeds air into the actuator.
Trouble Shooting

Manual
– 12 –

– 13 – Manual

Manual
– 14 –
Exploded drawing

– 15 – Manual
Dimensional drawing

Manual
– 16 –
13794/2002.7 Ekvator
Distributor
Postfach 2310
D-41554 Kaarst
GERMANY
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.pmv-germany.de
Palmstiernas Svenska AB
Box 21
SE-663 21 Skoghall
SWEDEN
Tel: [phone]
Fax: [phone]
E-mail: [email protected]
Internet: www.palmstiernas.se
SUBSIDIARIES:
PMV GmbH
PMV Controls Ltd
Headlands Business Park
Ringwood
Hampshire BH24 3PB
ENGLAND
Tel: [phone]
Fax: [phone]
E-mail: [email protected]
Palmstiernas Instrument AB
Korta Gatan 9
SE-171 54 Solna
SWEDEN
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.pmv.nu
(The information in this brochure is subject to change without notice.)
PMV-USA, Inc
1440 Lake Front Circle
Unit 160
The Woodlands, Texas 77380
USA
Tel: [phone]
Fax: [phone]
E-mail: [email protected]
Internet: www.pmvusa.com