SATEC EM920 Operation Manual - Manual (Page 118)

Chapter 5 Configuring the EM920
Configuring Recorders
118 EM920 Power Quality and Revenue Meter
Option Range Default Description
Hysteresis, % 0-50.0% 5.0 Defines the hysteresis for a fault trigger in percent
of the threshold
Trigger
Enabled Checked
Unchecked Checked Links a fault trigger to the Fault Recorder. If the
box is unchecked, the Fault Recorder does not
respond to the trigger.
Waveform Log
On Start Checked
Unchecked Checked Enables waveform log when the fault event starts
On End Checked
Unchecked Unchecked Enables waveform log when the fault event ends
Log No. 1-8 7 Specifies the waveform log file used for waveform
recording on the fault event
1/2-cycle RMS Trend
Log Enabled Checked
Unchecked Unchecked Enables recording of the RMS profile during a fault
event
Max. Duration 0-10,000
cycles
100 Maximum duration of the RMS profile log at a 1/2-
cycle rate. The logging is stopped automatically
when either a fault event ends or the specified
number of cycles has been recorded.
Before, Cycles 0-20 cycles 4 The number of cycles to be recorded prior to the
event
After, Cycles 0-20 cycles 4 The number of cycles to be recorded after the
event
Log No. 13 13 Specifies the data log file used for data recording
on the fault event
To enable or disable the Fault recorder in your meter:
1. Check or uncheck the “Recorder Enabled” checkbox.
2. Send the new setting to the device.
Configuring Analog Triggers
Voltage and current thresholds are normally specified as a
percent of a nominal (reference) voltage and current. The
voltage reference is the line-to-neutral PT secondary voltage
for the 4LN3 and 3LN3 wiring configurations, and the line-to-
line PT secondary voltage for other wiring configurations. The
reference value for current triggers is the CT secondary
current rating. See
Basic Device Setup in Chapter 5 for
information on specifying voltage and current ratings in your
device.
To make easier specifying thresholds for voltage and current
triggers, PAS shows you threshold values in secondary units
that match the percentage you selected for the triggers. To
update the secondary thresholds, type the threshold for a
trigger in percent, and then press Enter or click elsewhere on
the Fault recorder setup tab.
The picture above shows the factory set Fault recorder
options. Notice that the Overcurrent trigger can be used
along with the second Undervoltage trigger combined by
logical AND. If you wish to use the only Overcurrent trigger,
disable (uncheck) the second Undervoltage trigger.
The Zero-Sequence Voltage trigger and the Voltage
Unbalance trigger are disabled by default. Both are very
sensitive to phase unbalances. If you want to use them,