CVS Controls CVS1000L Product Manual - Page 9

Browse online or download pdf Product Manual for Valve Positioners CVS Controls CVS1000L. CVS Controls CVS1000L 13 pages. 1000l electro-pneumatic linear positioner

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Adjustment - Span

1. After setting zero, supply 20mA or 4mA of signal.

Check the actuator's stroke. If the stroke is too low,

adjust the span towards the (+) direction.

If the stroke point is too high, adjust the span towards

the (-) direction. (Figure 18)

2. Changing span points affects the zero point setting,

so the zero setting must be set again. After setting

zero point, confirm the span point. This step must be

repeated until both points are properly set.

3. After setting is completed, tighten lock screw.

Lock Screw

Adjustment - A/M Switch (Auto/Manual)

1. A/M switch adjusts the valve operation to automatic

or manual.

2. When produced, YT-1000L is set at "A(Automatic)".

If user prefers the positioner setting as "M(Manual)",

the setting can be changed by turning the switch coun-

ter-clockwise. (Figure 19)

3. If it is set as "M(Manual)", the air pressure will be

supplied to the actuator directly. Always set back to

"A(Automatic)" after setting change.

4. If OUT2 in single acting actuator or double acting

actuator is used, the A/M switch will not operate.

Product Manual: CVS Rack & Pinion Actuator

Lock Screw

Auto Manual Switch

Adjustment - Seat Adjuster

1. Seat adjustment is set according to the customers

request before the positioner is delivered. Please do

not adjust the seat adjuster.

2. Seat adjuster is always used for double acting

actuators and adjusted when the pressure balance

point must be changed. Please do not touch the seat

adjuster, because it can affect the positioner's

performance.

Output

Pressure

Output

Pressure

Output

Pressure

Input Pressure

Adjustment - Orifice

1. If the size of the actuator is too small relative to the

flow rate, the positioner can have hunting. In order to

avoid hunting, orifice can be used. There are three

types of orifice.

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Seat Adjuster

High Pressure Balance

(0.9~1.0Ps) - Normal

Balanced Point

Med. Pressure Balance

Balanced Point

(0.5Ps) - Normal

Balanced Point

Low Pressure Balance

(0.4~0.5Ps) - Normal

Ps=Supply Pressure

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Process Management

And Instrumentation