8.3 Configuring Power Quality Triggers
81
2. Under “Input Signal”, select the adjacent drop-down arrow and choose the desired parameter
on which you want to trigger.
3. Under “Channel,” select the measurement channel (e.g. A, B, C, Ave., etc.), or relevant value
according to the Input Signal type.
4. Select Limit Function (
x > limit
,
x < limit
,
|
x
|
> limit
,
|
x
|
< limit
,
|
x
−
ref
|
> limit
)
for the specific trigger. For example, to trigger for an event when the input signal (x) drops
below the assigned limit, select
x < limit
.
5. For Limit, type in a floating point value.
6. If using a reference value, click the Reference box and type in the floating point value.
Normally, you would use a reference value when the selected Limit Function was
|
x-ref
|
>
limit. In this example, ‘ref’ could be the nominal value, like 60 Hz.
7. Configure Dependency if you want one trigger to become Active only if another condition
becomes Active or Inactive.
Always configure the Master channel first
. For example, if you
want Channel 2 to trigger only if Channel 1 increases above a set limit, set up Channel 1 (the
Master channel) first.
8. Select a master channel number (1 – 32) under Master to set the dependency relationship.
For example, if in the previous step the dependency was ActiveMaster and the master trigger
was 1, then set Trigger 2 Dependency to “ActiveMaster”, and set Trigger 2 Master to “1”.
9. Select the Dwell Time column to set the time that the triggering conditions must be true
before the trigger becomes Active. This could be used to help reduce false triggers. Allowable
values are from 0 to 3267.75 seconds.
10. Repeat steps 2 – 9 to set up any other triggers, especially if there are master trigger channels
and dependencies.
11. Move on to the next step in Section 8.5, Configuring Data Logged.
8.3
Configuring Power Quality Triggers
In the 1133A, Power Quality triggers conform specifically to methods and definitions in IEC 61000-
4-30, section 5.4, Supply–Voltage Dips and Swells. While Power Quality triggers are set up in a
manner very similar to User (DSP) Triggers, and are part of the shared pool of 32 triggers, they
are different than User Triggers due to the methods and definitions of IEC 61000-4-30.
8.3.1
Power Quality Parameter Definitions
Channel:
AV, AI, CV, CI, BV, BI, NI - includes all of the input voltages and currents, including
neutral current.
Limit Type:
x > Limit
,
x < Limit
.
Limit:
A floating point value, constantly being compared to the measured, input channel value
(x) in order to capture an event trigger.
Limit Fmt:
(Limit Format) Absolute or Percent; choose the limit format that suits your
application. For Absolute, the limit is the same number as the value entered in for Limit. For
Percent, the measured value is compared to a percentage of the measured signal, and must be
entered as a decimal value (e.g. 90% entered as 0.9).
Ref Fmt:
(Reference Format) Absolute or Sliding; Absolute means that the reference value is
