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Advantage
ACU Sheet
Applications
Case Study
Reference
ACU Multi-circuit Sub-meter
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ACU
Sheet
ACU
Fact Sheet
The ACU provides flexible multi-circuit monitoring for bus bars, feeders, switchgear, motors, generators and power distribution panels. Wire once to the ACU and see the same data at both local control panel displays and the control center(s).
The P2C™ Dual Core processor architecture makes it all possible.
Applications
Enhanced functionality compared with traditional, discrete meter installations
- Economical metering for 3-phase feeders, switchgear and power distribution panels
- Bi-directional power metering for co-generation monitoring
- Up to 30 AC inputs per module for convenient monitoring of motor control centers. Daisy chain ACUs for even more circuits.
- Multi-circuit design provides single connection point for easy wiring to field terminations
- Distributed display panels don't need field wiring connected directly to them allowing easier, more flexible placement in control panels / switch boards
- Integrated metering for display panel and SCADA interface so on-site staff and control center see the same data at the same time.
- Integrates easily into existing GE D20, D25 or D400 SCADA systems.
Features
- Up to 30 direct AC inputs in flexible configurations
- 2 Optional DC inputs
- Support for 1, 2, 2.5 & 3 element metering
- Synchronized measurements to 100nS accuracy on all inputs with 1 PPS from GPS
- Automatic tracking and adjustment for fundamental frequency
- Revenue class metering: ±0.5% accuracy
- Frequency accuracy: ±0.01Hz accuracy
- Up to 31st Harmonic and THD calculations
- 64 samples per cycle
- Individual Display Panels for each circuit
- Pushbutton on Display Panel to advance display values through measurement groups
- Optional Web server support to view data via Internet Brower
- GPS time synchronization, NMEA 0183 Interface Standard compliant
Communications
Options
- D20 HDLC Link
- RS-232/485 up to 115kbaud
- 10/100 Ethernet
- DNP3.0
- IEC 60870-5-101/104
- Modbus
ACU
Spec Sheet
AC
Inputs |
| up
to 30 PT/CTs in flexible configurations |
| ±0.2%
accuracy on sampled values |
| ±0.5%
accuracy on power calculations |
| ±0.01Hz
accuracy on frequency measurement |
| THD
up to 31st harmonic |
| 64
samples per cycle |
| Automatic
fundamental frequency adjustments |
| Sample
and hold of all 30 inputs eliminates effects of
phase angle and magnitude changes during the sampling
cycle assuring accurate power calculations. |
DC
Inputs |
| +/-5Vdc |
| ±1mA,
±20mA, 4-20mA |
| Accuracy:
0.2% of full scale @ 25C |
| 16-bit
resolution |
Communication
Ports |
| 2
RS-232 or RS-485 ports |
| 1
RS-485 port |
| 1
10/100aseT Ethernet port |
| 1
D20 HDLC port |
| 1
RS-232 maintenance port |
Field
Terminations |
| PT/CT:
#10 AWG barrier |
| DC
Input: #12 AWG compression |
| Earth
ground: #12 AWG compression |
| Serial
Ports: DB9 Female |
| Ethernet:
RJ45 |
Memory
Model |
| Flash
ROM: 8MB |
NVRAM:
2MB |
| SDRAM:
32MB |
|
Power
Supply |
| 20-60Vdc
input |
| 1500Vac
isolation |
| Reverse
polarity protection |
| Input
fuse for protection |
| 15W
maximum input supply |
Dimensions |
| Up
to 15 PT/CT: |
19"
(L) x 8.75" (H) |
| Up
to 30 PT/CT: |
19"
(L) x 10.46" (H) |
| LED
Display Panel: |
4.2"
x 4.2" x 1" |
Environmental |
| Operational
Temperature: -25° to +55°C |
| Storage
Temperature: -40° to +85°C |
| Humidity:
93% non-condensing at 55°C |
ACU
Sheet.pdf >>
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