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Idiomas disponibles
Idiomas disponibles
ND 5790-1 61-830 instructions
Impulses
Impulses are short duration voltage spikes of an extreme magnitude. The VPM cap-
tures impulse automatically based on the peak value of the sine wave. Short dura-
tion events over 450V peak will generally log as impulses. The unit records the
extreme magnitude of the impulse whether in the positive or negative direction and
displays the absolute peak value.
Impulse Event
On-screen display
Any impulse
IMP
Run Events
A RUN event is recorded when the unit detects AC power. This may be when the
unit is plugged in, or when power resumes after an outage. Run event are displayed
in the LOG menu only.
Event
On-screen display
Start time
RUN
Loss Events
A LOSS is recorded when the voltage drops below the operating range of the unit
(15V). A loss is recorded in both the SAG menu and the LOG menu. To determine
the duration of a loss event, compare the time of the loss to the time of the corre-
sponding RUN in the LOG menu. Both short term and long-term interruptions will
show up as a LOSS if voltage drops below 15V.
Event
On-screen display
Voltage Loss
LOSS
Monitoring Standards:
15 monitoring standards have been pre-loaded into the VPM. These settings are
based on existing international voltage standards and are named for the standard
they duplicate. For example the default ITIC threshold settings are based on the
ITIC standard. Magnitude and duration thresholds may vary from the actual stan-
dard do to the technical capabilities of the hardware or a revision of the standard.
The CUSTOM option is included for those instances when a specific monitoring
standard is not appropriate, or has been revised. Refer to specifications for the trig-
gers used to duplicate each of the standards. Appropriate trigger settings will vary
by country, industry and application. The ITIC setting captures most events that
would have the potential of effecting equipment on 120V single-phase circuits. Use
the CUSTOM option to match triggers to manufacturers' specification when appro-
priate. Triggers consists of a magnitude and duration threshold. Magnitude is
expressed as a percentage of nominal voltage. Duration is expressed in cycles. At
60Hz 1 cycle = 16.7 milliseconds, at 50Hz 1 cycle = 20 milliseconds.
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10:40 AM
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Theory of operation:
Only events beyond set threshold are logged. Everything else in ignored:
ITIC Curve (Representation)
Equipment Problems
300
200
140
120
User Programmed nominal
100
voltage 100 to 240 VAC
80
70
X
Equipment OK
40
0
.01 c
.001 c
1 c
10 c
1 µsec
1 msec
20 msec
3 msec
How Long Event Lasts (Duration)
Using the default thresholds a voltage Sag of 68V for 2.5 Cycles is logged as fol-
lows:
Unplug VPM and press any
Press Enter to display Sag
key to display REVIEW
Event Log
screen
ENTER
The Event Detail screen displays the trigger surpassed, the event magnitude and
duration, and the data and time of the event. The magnitude displayed is the worst
case magnitude over the duration of the event.
8
Swell 2
Swell 1
Minor 1
Minor 2
Major 1
Less than 15 V actual
LOSS
Steady
100 c
State
0.5 sec
10 sec
Press right arrow to display
event Detail
1 Trigger surpassed
2 Event Magnitude and
duration
1
2
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