Power Quality Logger
Instrument and Logging Setup
35
Duration and Recording Start/Stop Date and Time.
The start
and stop of a logging session can be defined as:
•
Start/Stop button
Start/stop the logging session manually with the Start/Stop
button on the Logger. The Logger takes the pre-configured
settings and records data until the configured duration has
elapsed or the Start/Stop button on the Logger is pressed.
•
Immediate start
When this option is selected the Logger starts the logging
session immediately. The end of the logging session is
configured by the duration or by a stop date and time. The
logging session can always be stopped with the remote client
or pushing the Start/Stop button on the Logger for >3s.
Note
The 3 s (150/180 cycles) and 10 min interval used for power
quality graphs, harmonics, and PQ standard assessment
according to EN50160 and IEEE519 is synchronized to the
clock and starts and stops always at 10 min boundaries. For
example, a logging session from 09:05 to 09:35 contains two
10 minute intervals: One interval from 09:10 to 09:20 and one
interval from 09:20 to 09:30.
•
Configure a scheduled recording
Configure a scheduled recording by the duration and the start
date and time or by the start date and time and stop date and
time. This is a convenient method for how to set up the Logger
to measure a full week profile starting on Monday 0:00 and
ending on Sunday 24:00.You can set the duration of the
measurement from a list.
Maximum
configures the maximum
possible duration based on the available memory. For a
duration not shown in the list, select
Custom
to enter the
duration in number of hours or days. The logging session stops
automatically when the time duration has elapsed. You can
manually stop the logging session at any time.
Note
Even when a start date and time has been configured, you
must push the Start/Stop button on the Logger.
Connection Verification and Correction
Once the measurement is configured and the voltage and current
inputs are connected to the system under test, use the
Connection Verification
window to confirm the connection.
The verification detects:
•
Too low signal
•
Phase rotation for voltage and current
•
Inverted current probes
•
Wrong phase map
In the connection verification window:
1.
Toggle
Current Flow
between Generator Mode and Motor Mode.
Usually the current flow direction is toward the load. Use
Motor Mode for these applications. Use the Generator Mode
when the current sensors are connected intentionally to the
generator (for example, during the time energy goes into the
grid from regenerative braking system of an elevator or on-site
wind turbines).
The current flow arrow indicates the correct flow: a normal
condition is shown in Load Mode with a black arrow pointing
upwards, in Generator Mode the black arrow points
downwards. If the arrow is shown in red, the current flow
direction is inverted.
2.
Digitally swap phases and invert the current inputs instead of a
manual correction:
-
Click on the voltage or current input 1, 2, or 3 to select a phase.
-
Select another input.
