3--1 Operating the Controls

Status Information

The controller (CP) provides the status of the automatic transfer switch (ATS) and of both the normal and emergency sources. This information is at the status level of all screens and no password is required to view them.

You can press the right arrow "key to see the status of the Normal Source or press the left arrow A key to see the status of the Emergency source (the menus loop back).

EMERG SOURCE

NORMAL OK

NORMAL SOURCE

 

 

ATS Status

 

 

The ATS Status is the primary display. It shows the present status of the ATS.

 

 

Transfer sequence status and running time delays are shown. For inphase or

 

 

closed–transition transfers, phase relation between the sources is also shown.

Tip

The ATS Status display can be directly reached from anywhere in the menu

 

 

structure by pressing the Esc key three times.

 

 

Normal Source Status

 

 

The Normal Source Status display shows the rms voltage of each of the phases, the

 

 

source frequency in Hz, and the phase rotation. If enabled, the voltage unbalance

 

 

will also be displayed.

 

 

Emergency Source Status

 

 

The Emergency Source Status display shows the rms voltage of each of the phases,

 

 

the source frequency in Hz, and the phase rotation. If enabled, the voltage

 

 

unbalance will also be displayed.

Source Acceptability

The CP considers a source unacceptable if any of these conditions are true:

SAny phase voltage of the source is less than the voltage dropout setting. S Any phase voltage is greater than voltage trip setting for more than 3 sec. S Frequency of the source is less than the frequency dropout setting.

S Frequency is greater than frequency trip setting for more than 3 seconds. S Phase rotation does not match specified phase rotation (only if enabled).

S The phase unbalance is greater than the unbalance dropout setting (only if enabled).

The CP considers a source acceptable again when all these conditions are true:

SEach phase voltage is greater than the voltage pickup setting.

SEach phase voltage is less than trip voltage setting by more than 2% of nom S The frequency of the source is greater than the frequency pickup setting.

S Frequency is less than the frequency trip setting by more than 2% of nom. S Phase rotation matches the specified phase rotation (only if enabled).

S The phase unbalance is less than the unbalance pickup setting (only if enabled).

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Emerson 7000, 4000 Status Information, Source Acceptability, ATS Status, Normal Source Status, Emergency Source Status

4000, 7000 specifications

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