Service manual

24 – 3

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0

Section 24 • Twin Screw Control

Figure 24-3. Slide Calibration - Twin Screw Bump Pop-Up Window

Limit” setpoint to deﬁ ne an area within the mechani-

cal stops for normal slide travel. These software limits

purpose is to prevent the slide from actually hitting

the mechanical stops which could result in a number

of undesirable consequences. By default, the soft-

ware limits are set to 150mV from either end point.

The position percentage is calculated from the soft-

ware limits. Therefore, it is possible to read a value

greater than 100% or less than 0% if inertial carries

the slides after these limits are reached.

Position Signal Type:

• Position signals can be 0-5 VDC or 4-20mA to indi-

cate current slide valve position.

Compressor Bump Pop-Up Window

• This window allows the operator to bump the com-

pressor to ﬂ ush out any oil in the compressor after a

slide valve calibration, see Figure 24-3. If the oil level

is below the lowest sight glass in the oil separator,

then bumping the compressor is recommended.