PSL PQube - Page 68

PQube User Manual 2.1
Page 68 of 113
OPTIONAL ATT2 MODULE FOR DC POWER AND ENERGY
Voltage Channel
ATT2-600V
ATT2-1200V
Maximum Input Voltage
±1000 Vpk differential
±2000 Vpk differential
Rated Full-Scale Voltage
±600 VDC/300 VAC differential
±1200 VDC/600 VAC differential
Analog Input Channel Ratio
100:1
200:1
Accuracy
DC: ±0.1% rdg ±0.1% FS
50/60Hz: ±0.15% rdg ±0.15% FS
At 23ºC ±3ºC, 10% – 100% FS, in addition to error in PQube analog channels
Thermal drift of offset voltage
±0.005 mV/ºC typical
Thermal drift of gain
±0.01% rdg/ºC typical
Current Channel
With closed-loop sensors
With open-loop sensors
Rated Full-Scale Current
50A to 600A (depending on sensor model)
50A to 3000A (depending on sensor model)
Maximum Input Current
150% to 200% FS (depending on sensor model)
110% to 200% FS (depending on sensor model)
Accuracy at calibration current
0.15% rdg ±0.15% FS typical at DC
±0.3% rdg ±0.3% FS typical at DC
Hysteresis offset voltage error
< ±20 mV (after excursion of ±100% FS current)
< ±30 mV (after excursion of ±100% FS current)
Linearity
±0.1% rdg ±0.1% FS
±0.5% rdg ±0.5% FS
Thermal drift of offset voltage
±0.1 mV/ºC typical
±1 mV/ºC typical
Thermal drift of gain
±0.02% rdg/ºC typical
±0.1% rdg/ºC typical
INSTRUMENT POWER
Screw Terminals
(AC or DC) PQube POWER screw terminals [23], [31]
AC Input
24VAC ± 20% 50/60 Hz
DC Input
24-48VDC ± 20% (polarity independent)
Power Required
5VA max.
Isolation
PQube provides more than 150VDC isolation to all other circuits.
Internal UPS
Type
Lithium Polymer Battery (replacement batteries available from PSL).
Capacity
600mAH.
Backup Period
User controlled. 1 to 10 minutes, 3 minute default.
Storage & Discharge Temp.
-20ºC to +60ºC
Charge Temperature
0ºC to +45ºC
Charging Cycles
>500 full cycles.
Lifetime
Estimated 5+ years, depending on operating and environmental conditions.
Replacement Method
User-replaceable while PQube is operating (tool required).
Optional PS1 Plug-in Module
AC Input
100~240VAC ± 10%. 50/60 Hz
Power Required
25VA max
Isolation
Module provides more than 3200VDC isolation to all other circuits
POWER MEASUREMENTS
Definitions
Watts (power)
Sum of true instantaneous per-phase power.
Volt-Amps (apparent power)
Sum of per-phase product of RMS voltage and RMS current, taken over the measurement interval.
Power Factor
True power factor—ratio of Watts to Volt-Amps, displacement PF—cosΘ.
VARs (volt-amps reactive)
Budeanu definition or fundamental VARs—user-selectable.
Carbon (CO
2
rate & accumulated)
Based on patent-pending algorithm using watts and user-selected proportions of generator sources,
and user-supplied carbon generation rates for each source.
Current Unbalance
Measurement method ANSI C84.1.
Inputs
Voltages
L-N or L-Nm for delta configurations. Nm defined as measurement neutral, the instantaneous average
L-E voltage. All
Currents
L1, L2, L3, N, E currents. Optional user-selected calculated current on one channel for installations with
N-1 current transformers. All voltages scaled up to 10000:1 for current transformers.
Measurement interval
Phase-locked, 10-cycles (50 Hz nominal) or 12-cycles (60 Hz nominal). Approximately 5 readings per
second.
Accuracy excluding external CTs
Watts (power)
±0.2% typical at unity power factor, nominal voltage, 20% ~ 100% FS current. Better than ±0.25% rdg
±0.25% FS plus error due to phase angle uncertainty (<1.5° typical) for Θfundamental < ±30°, nominal
voltage, 10% ~ 120% FS current. Θfundamental=angle between fundamental voltage and fundamental
current.
Volt-Amps (apparent power)
Better than ±0.25% rdg ±0.25% FS typical (10% ~ 120% FS)