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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 le vel
of all screens and no password is required to view them.
You canpress 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).
NORMAL OK
EMERG SOURCE
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.
The ATS Status display can be directly reached from anywhere in the m enu
structure by pressing the Esc key three ti mes.
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:
S An y 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 d oes not match specified phase rotation (only if en abled).
S T h e phase un balan ce is greater th an the u nbalan ce drop out set ting (o nly if enabled ).
The CP considers a source acceptable
again when all these conditions are true:
S Each phase voltage is greater t han the voltage pickup setting.
S Each 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 s pecified phase rotation (only if enabled).
S The phase unbalance is less than the unbalance pickup setting (only if enabled).