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The ECM-1240 consists of two type of power monitoring inputs:
- CH1 & CH2 Inputs
- AUXILIARY Inputs (AUX1 to AUX 5)
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CH1 & CH2 INPUTS
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Measurement
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Measures "True" or "Real" power based on current and voltage oversampling. The measurements take power factor into account.
Uses automatic gain scaling.
Also measures voltage and current seperately.
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Input Signal:
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Requires a voltage signal proportional to the input current.
333mV Full-Scale
NOTE: The input signal MUST be galvanicaly isolated from the powerline.
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Input Impedance:
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20K ohm using the COM and SINGLE terminals.
40K ohm using the COM and DUAL terminals
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Max Power Measurement:
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65,535 Kilowatt per channel. (CH1 & CH2) |
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Max Current Measurement:
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546 Amps based on 120V line voltage |
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Accuracy:
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Typically +/- 1% plus CT & PT accuracy. |
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CT Compatibility:
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Specifically designed for Brultech's "SPLIT" CTs available for 60A, 100A, 170A, 200A and 400A.
Also compatible with Brultech's Micro CTs with the inclusion of a burden resistor.
Compatible with any CT having 333mV Full Scale and phase error < 2 degrees
CT scaling is configurable to suit the type of CT used.
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Energy Measurement:
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Kilowatt-Hour is calculated based on all samples and is updated every second. |
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Kilowatt-Hour (kWh) Resolution:
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1 Watt-Second |
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Net Metering:
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Measures directional energy to provide consumed/generated values crucial for net metering applications. |
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Power Resolution:
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1 Watt |
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AUX1 to AUX5 INPUTS
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Measurement
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Measures "True" or "Real" power based on current and voltage oversampling. The measurements take power factor into account. |
Input Signal
(AUX1 to AUX4):
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Requires a current signal proportional to the input current.
52.46 mA FS
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Power Metering:
Requires a current signal proportional to the input current.
52.46 mA FS with external 20 ohm resistor accross the COM and AUX5 terminals.
Pulse Counting:
Dry contact closure between the GND and AUX5 terminals. Contacts must be isolated from outside voltage sources or electrical ground.
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COMMUNICATION
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The ECM-1240 has the following communications ports:
- One RS-232 Port
- Optional wireless communication port
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RS-232 Port
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Connection:
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Terminal strip connection: Common, Transmit, Receive |
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Baud:
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19,200 Baud (8N1) |
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Wireless Communication (optional)
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NOTE: Wireless communication is not WiFi . |
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Frequency:
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2.4 GHz |
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Network Type:
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ZigBee mesh network |
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Transmit Power
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2mW |
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Antenna:
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Internal wire whip or External 2.1dBi swivel antenna |
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Sensitivity:
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-96 dBm |
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Range:
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133 Feet* indoors, 400 Feet outdoors (line of sight)
* Range is largely affected by the number of walls the RF signal must travel. The wall density, material and outside interference also affects the range.
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Interference Immunity:
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DSSS (Direct Sequence Spread Spectrum) |
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Baud:
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19,200 Baud |
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Hardware:
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Digi International's XBee module (www.digi.com) |
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Firmware:
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Digi International's ZB firmware. (www.digi.com) |
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Data Communication
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Configuration:
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Uses proprietary binary commands for initial configuration and setup. |
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Data Output:
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Choice of three packet format types:
- Binary (standard format)
- ASCII
- HTTP (requires EtherPort or EtherBee gateway)
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Binary Packets:
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The is the most common mode of operation. The packet data is configured for efficient data transfer using a proprietary protocol.
Packet Send Frequency: 1 second to 255 second
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ASCII Packets:
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This format is now offered with newer versions of the firmware to simplify the development of custom software.
Packet Send Frequency: 2 second to 255 second
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HTTP Packets:
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Using this format along with and EtherPort or EtherBee gateway, packets may be forwarded directly to a web server for processing using HTML, PHP, ASP or other web based languages.
Packet Send Frequency: 10 second to 255 second.
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Triggered Packet Send:
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Immediate packet send (within one second) for power changes of a defined amount.
Trigger Threshold: 10W to 65kW
*Does not apply to HTTP mode
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