Section 8 • Timers

Overview

The timers screen allows the operator to view and adjust timer settings associated with compressor operation. There are different types of timers that the operator should be aware of listed below, see Figure 8-1. Timers Screen.

Changeover:

•The changeover timers will change from one type control to another once the compressor has started and then the timer has expired.

Bypass:

•The bypass timers prevent certain alarm and trip checks from occurring until the compressor has started and then the time has expired.

Delays:

• Delays require the condition to occur for the specified

amount of time. Timers:

•A general timer requiring the time to expire before the listed event can occur.

Timer Setpoints

Capacity Increase Start Delay:

•At compressor startup, the capacity slide position is held at minimum position for this time period. This is to allow compressor and system conditions to stabi- lize. After the timer expires, the slide is free to move in accordance to the system demands.

Minimum Compressor Pre-lube Time:

•This is the length of time the oil pump will run, after establishing Pre-lube Oil Pressure, to prime the oil cir- cuit before starting the compressor.

Figure 8-1. Timers Screen

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

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Emerson 20/20 service manual Timers, Timer Setpoints
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20/20 specifications

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