Atec Yokogawa-WT3000 - Manual (Page 14)

14
Precision Power Analyzer WT3000
Number of
measurement
channels
Storage Interval
50 ms
1 sec
50 ms
1 sec
Approx. 10 hr 20 m
Approx. 86 hr
Approx. 2 hr 30 m
Approx. 24 hr
2ch
2ch
4ch
4ch 3
10
10
20
Measured Items
(Per CH)
Storable Amnt. of Data
Measurement Function
Rotating speed
Torque
SyncSp
Slip[%]
Motor output
Pm
Method of Determination, Equation
When the input signal from the revolution sensor is DC voltage (analog signal)
Input voltage from revolution sensor x scaling factor
Scaling factor: Number of revolutions per 1 V input voltage
When the input signal from the revolution sensor is number of pulses
When the type of input signal from the torque meter is DC voltage (analog signal)
Input voltage from torque meter x scaling factor
Scaling factor: Torque per 1 V input voltage
When the type of input signal from the torque is number of pulses
Enter N·m equivalent to upper- and lower-limit frequencies to determine an
inclination from these two frequencies, and then multiply the number of pulses.
Number of input pulses from revolution sensor per minute
Number of pulses per rotation
× Scaling factor
120 x freq. of the freq. meas. source
motor’s number of poles
SyncSp-Speed
SyncSp
× 100
2 π× Speed × Torque
60
× scaling factor
Functions
Measurement method Digital multiplication method
Crest factor 3 or 6 (when inputting rated values of the measurement
range), and 300 relative to the minimum valid input. However,
1.6 or 3.2 at the maximum range (when inputting rated values
of the measurement range), and 160 relative to the minimum
valid input.
Measurement period Interval for determining the measurement function and
performing calculations.
Period used to determine and compute the measurement
function.
• The measurement period is set by the zero crossing of the
reference signal (synchronization source) when the data
update interval is 50 ms, 100 ms, 5 s, 10 s, or 20 s (excluding
watt hour WP as well as ampere hour q during DC mode).
• Measured through exponential averaging on the sampled
data within the data update interval when the data update
interval is 250 ms, 500 ms, 1 s, or 2 s.
• For harmonic measurement, the measurement period is from
the beginning of the data update interval to 9000 points at the
harmonic sampling frequency.
Wiring You can select one of the following five wiring settings.
1P2W (single phase, two-wire), 1P3W (single phase, 3 wire),
3P3W (3 phase, 3 wire), 3P4W (3 phase, 4 wire),
3P3W(3V3A) (3 phase, 3 wire, 3 volt/3 amp measurement).
However, the number of available wiring settings varies
depending on the number of installed input elements. Up to
four, or only one, two, or three wiring settings may be
available.
Compensation Functions • Efficiency Compensation
Compensation of instrument loss during efficiency calculation
• Wiring Compensation
Compensation of instrument loss due to wiring
• 2 Wattmeter Method Compensation (/DT option)
Compensation for 2 wattmeter method
Scaling When inputting output from external current sensors, VT, or
CT, set the current sensor conversion ratio, VT ratio, CT ratio,
and power coefficient in the range from 0.0001 to 99999.9999.
Input filter Line filter or frequency filter settings can be entered.
Averaging • The average calculations below are performed on the normal
measurement parameters of voltage U, current I, power P,
apparent power S, reactive power Q. Power factor l and phase
angle Ø are determined by calculating the average of P and S.
Select exponential or moving averaging.
• Exponential average
Select an attenuation constant of 2, 4, 8, 16, 32, or 64.
• Moving average
Select the number of averages from 8, 16, 32, 64, 128, or 256.
• The average calculations below are performed on the
harmonic display items of voltage U, current I, power P,
apparent power S, reactive power Q. Power factor l is
determined by calculating the average of P and Q.
Only exponential averaging is performed. Select an
attenuation constant of 2, 4, 8, 16, 32 or 64
Data update rate Select 50 ms, 100 ms, 250 ms, 500 ms, 1 s, 2 s, 5 s, 10 s, or
20 s.
Response time At maximum, two times the data update rate (only during
numerical display)
Hold Holds the data display.
Single Executes a single measurement during measurement hold.
Zero level compensation/Null Compensates the zero level.
Integration
Mode Select a mode of Manual, Standard, Continuous (repeat),
Real Time Control Standard, or Real Time Control Continuous
(Repeat).
Timer Integration can be stopped automatically using the integration
timer setting. 0000h00m00s~10000h00m00s
Count over If the count over integration time reaches the maximum
integration time (10000 hours), or if the integration value
reaches max/min display integration value (
± 999999 M), the
elapsed time and value is saved and the operation is stopped.
Accuracy ± [power accuracy (or current accuracy) + time accuracy]
Time accuracy ± 0.02% of reading
Remote control EXT START, EXT STOP, EXT RESET, EXT HOLD, EXT
SINGLE and EXT PRINT (all input signal) / INTEG BUSY
(output signal). Requires /DA option.
Display
• Numerical display function
Display resolution
600000
Number of display items Select 4, 8, 16, all, single list, or dual list.
• Waveform display items
No. of display rasters
501
Display format Peak-peak compressed data
Time axis Range from 0.5 ms–2 s/div. However, it must be 1/10th of the
data update rate.
Triggers
Trigger Type Edge type
Trigger Mode Select Auto or Normal. Triggers are turned OFF automatically
during integration.
Trigger Source Select voltage, current, or external clock for the input to each
input element.
Trigger Slope Select (Rising), (Falling), or (Rising/Falling).
Trigger Level When the trigger source is the voltage or current input to the
input elements. Set in the range from the center of the screen
to
± 100% (top/bottom edge of the screen). Setting resolution:
0.1%
When the trigger source is Ext Clk, TTL level.
Vertical axis Zoom Voltage and current input to the waveform vertical axis zoom
input element can be zoomed along the vertical axis.
Set in the range of 0.1 to 100 times.
ON/OFF ON/OFF can be set for each voltage and current input to the
input element.
Format You can select 1, 2, 3 or 4 splits for the waveform display.
Interpolation Select dot or linear interpolation.
Graticule Select graticule or cross-grid display.
Other display ON/OFF Upper/lower limit (scale value), and waveform label ON/OFF.
Cursor measurements When you place the cursor on the waveform, the value of that
point is measured.
Zoom function No time axis zoom function
* Since the sampling frequency is approximately 200 kHz, waveforms that can be accurately
reproduced are those of about 10 kHz.
• Vector Display/Bar Graph Display
Vector display
Vector display of the phase difference in the fundamental
waves of voltage and current.
Bar graph display Displays the size of each harmonic in a bar graph.
• Trend display
Number of measurement channels Up to 16 parameters
Displays trends (transitions) in numerical data of the
measurement functions in a sequential line graph.
• Simultaneous display Two windows can be selected (from numerical display,
waveform display, bar graph display, or trend display) and
displayed in the upper and lower parts of the screen.
Saving and Loading Data
Settings, waveform display data, numerical data, and screen image data can be saved to
media.*
Saved settings can be loaded from a medium.
* PC card, USB memory (/C5 option)
Store function
Internal memory size Approximately 30 MB
Store interval (waveform OFF) Maximum 50msec to 99 hour 59 minutes 59 seconds.
Guideline for Storage Time (Waveform Display OFF, Integration Function OFF)
Note: Depending on the user-defined math, integration, and other settings, the actual
measurement time may be shorter than stated above.
Store function can’t use in combination with auto print function.
Motor Evaluation Function (-MV, Motor Version)