Emerson E2 Manual del operador descargar pdf (Pagina 23)

Figure 3.29 Suction Group Setup Screen

From this screen you can edit the name of the suction

group, select the control type, and enter the number

of stages. The number of stages can be determined

as follows:

A compressor with an unloader will count as two

stages. A compressor without an unloader will count

as one stage.

To continue the suction group setup process:

1. Press F2 (Next Tab) until the Comp Setup screen

is displayed.

2. Under Type, select Comp for compressor or Unld

for unloader.

3. Under HP/Amps enter the compressor horsepow-

er for each stage.

4. If run proofing is desired, select Yes under Proof.

Note: For a compressor equipped with an unloader

the horsepower should be divided between the

compressor and unloader stages. A compressor with

an unloader can be considered to be two different

compressors from a control standpoint. When the

suction group status screen shows the unloader to be

“off” and the comp (compressor) to be “on”, the com-

pressor is running “unloaded”, i.e. the unloaded por-

tion of the compressor is not contributing to

generation of capacity (this is confusing since the

unloader solenoid in this case is actually “on”). If the

comp and unloader are both “on”, the compressor is

running at full capacity.

When the steps above have been completed, the

compressor setup screen should look like figure 3.30.

To continue the suction group setup process:

1. Press F2 (Next Tab) to go to the Comp Outs

screen.

2. Press F3 (Edit).

3. Press 1 (Alternate I/O Format).

4. Press 2 to change the I/O format from board/point

to controller/application/property.

5. Under Controller, use the F4 lookup function to

select the E2 rack controller.

6. Under Application, use the F4 lookup function to

select the appropriate compressor.

7. Under Property, use the F4 lookup function to

select Comp Run In.

Note: If the stage being mapped is an unloader,

select Unloader 1 In for Property.

AE8-1337 R1

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