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The Eaton DC Energy Meter (DEM) measures the current and voltage of DC powered equipment racks using precision Hall Effect current transducers. The DEM samples the supply voltages and currents at regular intervals and along with the sampling period will compute the accumulated energy consumption as an Energy Meter reading in kWh. 8 current input channels, dual (A+B) power feeds and configurable system alarms make the DEM perfectly suited for various applications such as telecommunications, communication building monitoring and 48V DC power system energy measurement.
| Mechanical |
|
| Dimensions H, W, D |
1RU (44.5mm), 445mm, 229.5mm |
| Mounting |
19 & 21 inch rack mounting brackets |
| Weight |
4.5kg (TBC) |
| Environmental |
|
| Ambient Temperature Nominal: DEM Rated Operating Range: DEM Extended Operating Range: DEM Current Sensor Operating Range: |
25 +/- 5°C - 10°C to 50°C - 25°C to 70°C May affect product lifetime, meter accuracy & display contrast -10°C to 80°C |
| Altitude |
< 3000m |
| Humidity |
< 95% RH (non-condensing) |
| Location |
This unit must be installed in a restricted access location |
| DEM DC Ratings |
|
| Rated Voltage |
24V to 48VDC |
| Operational Range Power Input Connector |
18V to 60VDC Plane ‘A’ & Plane ‘B’ inputs 2 x Miniature 1.0 inch pitch 2-way male connectors (COM, -48V) |
| Current Consumption DEM (SC200 & 2 x IOBSS-00) Current Transducers |
160mA <25mA per transducer |
| Current Sensor Input Connector |
8 x Miniature 1.0 inch pitch 4-way male connectors (COM, -48V, M, GND) |
| Earthing |
Class II |
| Fault Protection (internal) |
‘A’ & ‘B’ voltage feed cables connected direct to active busbars are fitted with in-line Tyco RXEF135 polyswitches at bus bar tap points |
| Fault Protection (external) |
‘A’ & ‘B’ voltage feed cables connected direct to active busbars are fitted with in-line Tyco RXEF135 polyswitches at bus bar tap points |
| Isolation |
‘A’ & ‘B” 2A/50kA circuit breakers / isolators |
| DEM Energy Metering |
|
| Primary Current DC Energy Meters |
4 Plane ‘A’ & 4 Plane ‘B’ logical Energy Meters (logical) 1 Plane ‘A’ aggregate & 1 Plane ‘B’ aggregate Energy Meter (logical) |
| Sampling rate |
2 voltage & 8 current sense inputs sampled periodically at a 1 sec rate |
| Computation of Energy rate |
10 Energy computations, 10 Power computations (max, actual, min) periodically at a 1 sec rat |
| Remote polling rate for Energy values |
Minimum 10 second repetition rate |
| Accuracy Voltage measurements Current measurements Energy consumed |
+/- 1.0% of FSR +/- 1.0% of FSR +/- 2.4% of FSR for each “delta” Energy calculation (per logical Energy Meter) |
