Manuals / Emerson / Power Tools / Air Compressor

Emerson 20/20 service manual Step Control

Models: 20/20

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Section 11 • Condenser Control

Condenser Press:

•This is the read only parameter and it displays the present value of condenser pressure.

Condenser Setpoint:

•This is the condenser pressure setpoint that needs to be maintained.

Upper Deadband:

•This is the condenser pressure setpoint upper dead- band value. No additional condenser capacity is add- ed when the condenser is selected for automatic step control and the condenser pressure falls within this deadband.

Lower Deadband:

•This is the condenser pressure setpoint lower dead- band value. Condenser capacity is not reduced when the condenser is selected for automatic step control and the condenser pressure falls within this deadband.

Ambient Temp:

•This is the read only parameter and it displays the present value of ambient temperature. This is dis- played only when Ambient Sensor is enabled from Configuration Screen.

Wetbulb Temp:

•This is the read only parameter and it displays the present value of wetbulb temperature. This is dis- played only when Wetbulb Sensor is enabled from Configuration Screen.

Wetbulb Offset:

•This is the offset value from wetbulb temperature as the override point.

Switch Temp:

•This is the ambient temperature setpoint used for au- tomatic switching of profile from summer to winter and vice-versa.

Profile Selection:

•Profile selection allows operator to have two different output profiles for summer and winter. Operator can have different selection of fans, pumps & VFD in five steps of step control table. Different profiles allow inclusion/exclusion of water pumps in cold weather when summer/winter auto switch is enabled. This selection is inactive when Run mode is Auto and Summer/Winter Auto Switch is enabled.

High to Low Speed Fan Delay:

•This is a time delay for the fan spin down in case of 2- speed motor/dual speed fan.

Summer/Winter Auto Switch:

•This checkbox when enabled allows profiles to switch automatically depending on ambient temperature setpoint when Run Mode is “Auto”. When ambient temperature falls below ambient temperature set- point, winter profile is used. Similarly when ambient temperature is above ambient temperature setpoint, summer profile is used.

Wetbulb Override:

•This checkbox when enabled gives the operator a functionality to control energy wastage. When the condenser temperature reaches wetbulb tempera- ture plus the operator given offset, then the con- denser control operation does not add additional steps. This is done as it is not possible to lower the temperature anymore, and by adding more fans or pumps controls the operation by manually stepping using an on/off toggle button at each step.

Step Control

The Step Control allows the operator to setup the man- ner in which Fans, Pumps & VFD will be turned on/off. Fans & Pumps are connected on digital outputs Out #1 to Out #4. VFD Fan is connected on Analog Output. Each step can have maximum of five outputs connected to it. Each step can be opted in or out depending on enabling of checkbox, see Figure 11-2. Step Control Screen.

When Run Mode is Auto and condenser pressure rises above upper deadband, condenser step gets incremen- tal from Step 1 to Step 5 and hence switching on/off Pumps, Fans & VFD connected on outputs. This holds true for decremented of steps from Step 5 to Step 1 when condenser pressure falls below lower deadband.

Step Delay:

•Allows operator to set time delays between condens- er steps. Condenser Pressure must be outside upper or lower deadband continuously for delay time in or- der to increase or decrease condenser steps. While in a VFD step, an additional step can only be added once VFD has reached its maximum speed setpoint and the delay timers are satisfied.

•Similarly in a VFD step, a step can only be removed once VFD has reached its minimum speed setpoint and the delay timers are satisfied. Step Delay acts as “ON” timer while loading and acts as “OFF” timer while unloading for the same step.

Low Speed Fan:

•Allows steps to have option for time delay in case of fan spin down. Any of Out #1 to Out #4 can be

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

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Emerson 20/20 service manual Step Control
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