Emerson 20/20 service manual Operational Flow Charts, Requirements to Start Compressor

Models: 20/20

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Section 1 • Operational Flow Charts

Requirements to Start Compressor

Volume and Capacity slides are less than 5%

Oil Separator Temp

 

 

Filter Diff Press <

 

>Oil Sep Start Trip

 

 

Start Filter Diff Trip

 

Setpt

 

 

Setpt

 

 

 

 

 

 

 

 

 

 

 

 

 

Oil Pump On: Prelub Oil Press is > Prelub Oil

Press Reset Setpt for “Min Compressor Prelub Timer” setting (typically 5 seconds)

Start Compressor

Critical Compressor Run Logic at Compressor Start

Start

Compressor

 

Is

 

 

 

 

“Oil Press

 

Run Oil Press>

 

 

 

 

 

 

 

 

 

Bypass at Comp

 

Prelub Oil Press

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

Start” timer

 

Reset setpt?

 

 

 

 

 

 

 

 

expires (60 sec

 

(Default 5 PSI)

 

 

 

 

 

 

 

 

 

after start)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

Run Oil Press Failure

 

 

 

Yes

“Filter Diff

Press Safety

Is Filter Diff

>

Hi Filter Diff Press Run

Changeover” timer expires

Trip Setpt

 

(60 sec after start)

 

for 5 seconds

 

 

 

Is

 

Run Oil Press>

Yes

Run Oil Press

Reset setpt?

 

 

(Default 40 PSI)

 

No

 

Run Oil Press Failure

 

 

 

Oil Separator Temp

 

 

 

Is

 

 

 

 

 

 

 

Safety Changeover

 

 

 

Oil Sep Temp > Lo

 

 

 

 

No

 

 

 

Yes

 

 

Yes

 

Run

 

 

Timer expires (5 min

 

 

Oil Sep Run Reset

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

after start)

 

 

 

setpt?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

No

Run Filter Diff Press Failure

Lo Run Oil Sep Temp Failure

Compressor Amperage Load Limiting

 

Is

 

 

 

 

 

 

 

 

Motor Amps >

 

 

 

 

 

 

 

Capacity Increase

 

 

 

 

Yes

 

 

FLA (ON)

 

 

 

 

 

 

Disabled

 

 

 

 

 

 

 

Setpt?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Capacity Decrease

Motor Amps >

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

until Amps < FLA x

FLA (OFF)

 

 

 

 

 

 

 

 

 

 

 

 

 

1.0625

Setpt?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal Loading and

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

Unloading

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

High Discharge Pressure Load Limiting

 

Is

 

 

 

 

 

 

 

Dsch Press >

 

 

 

 

 

 

Capacity Increase

 

 

 

Yes

 

 

Cutin (ON)

 

 

 

 

 

Disabled

 

 

 

 

 

 

Setpt?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is

 

 

 

 

 

 

 

 

 

 

 

 

 

Capacity Decrease until

Dsch Press >

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

Dsch Press < ON Setpt x

Cutout (OFF)

 

 

 

 

 

 

 

 

 

 

 

1.0625

Setpt?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal Loading and

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

Unloading

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 1-1. Operational Flow Charts (1 of 2)

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153

1 – 1

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Emerson 20/20 Operational Flow Charts, Requirements to Start Compressor, Critical Compressor Run Logic at Compressor Start

20/20 specifications

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