VAC V100 Bedienungsanleitung

Trouble Shooting Guide for V100 Positioner

1) 1.V100 not responding to input signal

a) The tubing to the actuator may be

incorrect

i) Plant Air Supply should be ported to

the Sport on the side of the

positioner. Supply must be

greater than 30 PSI.

ii) The pneumatic control signal

(3 to 15 psi) should be ported to

the Ip port on the side of the

positioner.

If the positioner is a V100E, using

an I/P on the positioner, the Ip

port should be plugged tightly!! Double check once plug is in place to make sure

there is no air leakage from Ip plug.

iii) The driving port of this positioner is the C+ port. In other words, on an

increasing control signal the supply is directed through the positioner to the

C+ port. This is very important – not only for single acting

or spring assist valve packages, but also to insure proper

air to open (or close) operation (rotation).

b) I/P wiring

i) Make sure the unit is properly wired.

(1) The positive terminal (+) MUST have a positive

voltage to it.

(2) The negative terminal (-) MUST have a negative voltage to it.

c) I/P operation

i) If the I/P has been in use the potential for contaminated air

supply exist – check the I/P by either of the following steps.

(1) Install a gauge on the I/P gauge port (1/8 inch NPT) to make

sure that the I/P is generating a 3 to 15 psi pneumatic output in correlation to

the 4 to 20 mA input signal.

(2) Using an ohm meter check to make sure that there is resistance still in the

loop. A good unit will put out 240 Ω or more.

d) Cam

i) If cam nut and locking screw are not correctly inserted the positioner will not work

correctly, generally resulting in the cam slipping and a small input change will

equal a full stroking of the actuator. Make sure that the locking screw is all the

way out before you tighten the cam nut; then secure the locking screw

(the cam nut is the ﬁrst lock – the screw is the second lock). The cam pictured

below is INCORRECT, and will result in cam slipping and full stroking of the

actuator on small input changes.

ii) Make sure that the Positioner action (direct acting or reverse

acting) corresponds with the cam. A “D” or an “R” can be

found on the cam to indicate direction of cam rotation.

(1) An easy way to check this is to remove the cover of the

positioner and watch the rotation to ensure that cam

placement is correct.

e) Spool Valve

i) Dirty air can cause particulates to cause “sticking” and prevent the positioner

from working correctly. (see below hunting)

(1) Remove the spool valve and blow out with air. If air is not available wipe down with cloth.

Once cleaned the spool piece should slide very easily in its housing. Place spool valve back into

positioner making sure that the slotted top of the spool piece is connected

correctly on the balance arm.

f) Gauge Plugs

i) All gauge plugs or gauges must be secure (no air leaks!!). If the

plugs or gauges are not properly tightened air can leak causing the

positioner not to respond to input signal. Note: gauges are very

useful when trouble shooting a positioner. This helps “inspect” the

air ﬂow through the positioner as well as the I/P output. Three 0-160

psi gauges are used for the supply (S port) and two output ports

(C+ and C-). A 0-30 psi gauge is used for the I/P output.

g) Mounting

i) Rotary

(1) The positioner will not work correctly if the positioner is not engaged properly in the actuator.

Check the positioner to actuator coupling to see if the positioner

and actuator are mated correctly.

ii) Linear

(1) Slop – can result when the actuator to positioner components

are loose or improperly connected. A linear arm is what converts

the linear motion to a rotary motion for the positioner. If there is

slop or play in the assembly, it can cause the positioner not to perform correctly. A rule of thumb

when mounting on linear actuators is when at 50% of input signal the linear arm should be at

mid stroke, thus making a 90 angle with the linear arm and the valve stem.

2) Hunting or Oscillation

a) Spool Valve

(1) Remove the spool valve and blow out with air. If air is not available wipe

down with cloth. Something every soft, like a pipe cleaner should be used

to clean the inside of the spool block itself. Once cleaned the spool piece

should slide very easily within the housing. Place spool valve back into

positioner making sure that the top of the spool piece is connected

correctly on the balance arm.

(a) DO NOT USE WD40 or OIL BASED LUBRICANTS TO CLEAN

SPOOL PIECE.

(2) Due to our superior air delivery sometimes on small actuators this can cause

hunting to occur. This can also occur when dealing with damper drives as well,

do to the weight and stroke of the damper.

(a) If there are doubts on which spool valve to order call our service

center at 205.678.0507

(b) Replace standard spool valve with the Low Gain spool valve. VAC

will do an exchange at no cost.

Reversing a positioners action

A common question that Valve Accessories & Controls often gets from the ﬁeld is that a customer

has a valve package with our positioner however they wish to reverse the input signal and action

of the valve. For example a customer has a valve that is closed at 4mA and open at 20mA. The

below diagrams are 4mA closed and 20mA open. The diagram on the left is a double acting

actuator and the one on the right is single acting.

The customer would now like the opposite from their valve. They would like to have open at

4mA and closed at 20mA. The diagrams below are 4mA open and 20mA closed. The double

acting is on the left and single acting is on the right.

Here is a step by step procedure in getting from 4mA closed and 20mA open to 4mA open and

20mA closed.

For the positioner adjustment, we have to make two key changes:

1-change the actuator/positioner porting

2-change the cam conﬁguration

1. The tubing must be reversed. C+ tube must now go to C- and C- must go to C+.

So for double acting actuators you do exactly that, just reverse the tubing, for single acting,

C+ would now be plugged and C- would now be piped to the actuator.

2. Remove the front cover and the indicator in order to expose the cam nut and cam-notice

the cam position.

3. Loosen the cam nut and take the cam out and ﬂip it over-literally 180 degrees.

Place the cam back in the positioner making sure that it is on the opposite lobe side.

(example: on a C1 cam it would go from the C1 A 90D side to the C1 B 90R side)

DO NOT TIGHTEN THE CAM NUT.

4. a. is for double acting applications, b. is for single acting applications

a. For double acting applications apply supply air to the positioner. This should move the valve

open, the desired 4mA position. Now simply tighten cam nut. Now the positioner will be

working 4mA Open to 20mA close.

b. Since the positioner was set up originally 4mA closed we must now apply air to the

actuator to get the valve

to move to open. This is

done by pushing up on the

balance arm. The

balance arm is labeled #2

in this picture. As you can

see the balance arm is

connected to the spool

valve (#6) through

connection #7. By pushing

up on the balance arm we

are exhausting air out of the

C- port. Once the valve is

open continue to hold the

balance arm up and tighten

the cam nut. Once the cam

nut is tightened release the balance arm, the positioner is now set to operate from

4mA open to 20mA closed.

The positioner should now be operating as 4mA is open and 20mA is closed.

Note: This will not change the “fail safe” action on an actuator with springs (usually

single acting application). To change the fail safe action you should contact the actuator

manufacturer.

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