ERL tesla lite, User Manual, Page: 96 / 288

8 Configuring the Recorder
8-18 TESLA LITE User Manual D03283R01.10
Scaling Input
Channels
AC Scaling
When you select the View/Set Scale button on the Analog Input form for an ac
channel, Control Panel displays the Scaling dialog box for details see Figure
8.13: AC Scaling on page 18. The scaling factor represents the turns ratio of
the primary transducer (CT or PT). The nominal secondary value is used as the
default calibration level for the channel.
Figure 8.13: AC Scaling
Sag and Swell
Detectors
Sag and Swell detectors are available on voltage channels. There are three re-
lated fields in the Configuration screen controlling Sag and Swell detectors.
The definition of a Sag or Swell depends on a Nominal Level of voltage. The
Sag and Swell thresholds are expressed as a percentage of the Nominal Level.
The Sag threshold is configurable between 50% and 90% of Nominal. The
minimum Sag level is fixed at 10% of Nominal. The Swell threshold is config-
urable between 110% and 150% of Nominal. The maximum Swell level is
fixed at 180% of Nominal.
The duration of a Sag or Swell is fixed at any value between 0.5 cycle and 1
minute.
Alarm Contact Specifies a rear panel contact to be closed when triggered. Contacts
are closed momentarily for one second. Contact assignment is not
exclusive, allowing multiple triggers to activate the same contact.
Contacts assigned for storage alarms (“TESLA Alarms” on page 8-6)
will not be available for use here.
Table 8.8: Analog Input Channel Settings