SENVA EMX True RMS Energy Meter Instruction Manual

SENVA EMX True RMS Energy Meter

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
Failure to follow these instructions may cause serious injury or death

• Do not use this product for life safety applications.
• Do not install this product in hazardous or classified locations.
• Only qualified trade installers should install, program, maintain and test system incorporated therein. Installer is responsible for compliance of all applicable codes.
• Read, understand, and follow instructions thoroughly.
• The Standard CTs associated with this product must be mounted inside a suitable fire and electrical enclosure. For safe electrical work practices, see NFPA 70E in the USA or applicable local standards and codes.
• Replace all doors, covers, and protective devices before powering the equipment.
• Product may use multiple voltage/power sources. Disconnect ALL sources before servicing.
• Use a properly rated voltage sensing device to confirm that power is off. DO NOT depend on this product for voltage indication.
• The installer is responsible for conformance to all applicable codes.
• For use with Listed Energy Monitoring Current Transformers.
• Use Copper Conductors Only
• Per IEC 61010-1 section 8.2.2 “impact test”, this product tested with energy of 2J (reduced from 5J) code: IK07

Failure to follow these instructions may cause injury, death or equipment damage.

• If product is used in a manner not specified by the manufacturer, the protection provided by the product may be impaired. No responsibility is assumed by the manufacturer for any consequences arising out of the use of this material.

LIMITATION OF LIABILITY

Senva’s liability, whether in contract, in tort, under any warranty, in negligence or otherwise shall not exceed the amount of the purchase price paid by the purchaser for the product. Under no circumstances shall Senva be liable for special or consequential damages.

FEATURES

The Senva EMX Advanced Energy Meter is a 3 channel True RMS energy meter featuring a color OLED display for simple commissioning and monitoring. The EMX meets ANSI C12.20 Class 0.2 Standards. The EMX supports both BACnet MS/TP and Modbus RTU protocols and also includes 2 pulse inputs and 2 pulse outputs.

The EMX supports metering CTs with either a 0.333V voltage output or di/dt signal. The EMX is a class 2 low voltage device for mounting flexibility. See Specifications section for recommended conductor gauge and terminal tightening torque.

MOUNTING

The Senva EMX Advanced Energy Meter is suitable for installation on T35 DIN rail. Simply place unit approximately centered over the mounted DIN rail and press upward until the bottom clicks into place. Using a flat-nose screwdriver, pull top tab and apply pressure downward until unit is flush and release the tab. See Dimensions section for details.

DIMENSIONS

WIRING

EMX Wiring

Using Traditional metering CTs please wire according to the following diagram.

Wiring for connections labeled “Class 2” shall be permanently separated from those labeled “Class 1” by a minimum of 6 mm by means of clamping, routing, or equivalent means.

Typical Metering CT Wiring

A compatible metering CT has either a 0.333V voltage output or di/dt signal. The wiring shown below corresponds to a Senva Metering CT and may not represent the coloring for all compatible CTs.

WARNING: To reduce the risk of electric shock, always open or disconnect circuit from power distribution system (or service) or building before installing or servicing current transformers.

Current transformers are not suitable for Class 2 wiring methods and not intended for connection to Class 2 equipment.

Field installed current transformers can be installed in panel boards or switch gear enclosures and shall be installed according to the following:

1. Always open or disconnect circuit from power-distribution system (or service) of building before installing or servicing current transformers.
2. The current transformers may not be installed in equipment where they exceed 75 percent of the wiring space of any cross-sectional area within the equipment.
3. Restrict installation of current transformer in an area where it would block ventilation openings.
4. Restrict installation of current transformer in an area of breaker arc venting.
5. Secure current transformer and route conductors so that they do not directly contact live terminals or bus.

TYPICAL 3Ø WIRING 120 to 600VAC

Voltage Wiring

UL 240.21 code permits qualified installers to forgo use of a disconnect device (fuses or circuit breakers) when connecting the voltage reference of the CT, as long as the tap does not exceed 10 feet and complies with additional guidelines regarding ampacity rating, enclosure spacing and point of connection. It is the responsibility of the installer to ensure the system meets the requirements of the UL 240.21 code.

If the installation does not conform with the UL 240.21 code or the voltage reference must be extended beyond 10 feet, proper use of over current protection is required (i.e., fusing or circuit breakers.)

In the U.S. and Canada, disconnecting fuse holders or circuit breakers can be used. Place this device in close proximity to the CT and within easy reach of the operator, and mark it as the disconnecting method. The disconnect shall meet the relevant requirements of IEC 60947-1 and IEC 60947-3 and shall be suitable for the application. Provide over-current protection and disconnecting method for supply conductors with approved current limiting devices suitable for protecting the wiring.

OPERATION

Once power is applied to the unit, the OLED screen will display the summary screen for a single load meter. To review more system measurements, the up and down arrows will cycle between the summary page, power readings, amperage readings, and voltage readings.

Power Setup

To set up the meter for the correct circuit, press the enter button to enter the Metering Menu. The connection type 3-phase ABCN or ABC and 1-phase ABN or AB must be selected via menu, this must correspond to the wiring method used.

Wiring Config: Press enter to choose between single circuit or multi-circuit.

RS485 setup

The EMX is designed to easily connect to an existing communication network. To configure the network baud rate, protocol type, serial formats, and self- address (BACnet only), press the enter button and scroll down to access the Communication Menu. Here you can set the following:

1. Protocol: Press enter to choose between BACnet MS/TP or Modbus RTU.
2. Device Address: Press or hold enter to increase address
3. Baud Rate: Press enter to choose between 9600, 19200, 38400, 57600, 76800, and 115200.
4. Parity: Press enter to choose between none, even, and odd
5. Stop Bits: Press enter to choose between 1 and 2.

Alarm Menu

If any alarm is present, a red exclamation mark will appear in the top right corner of the OLED. At any time during normal operation, user may scroll to the alarm menu to view active or previous alarm conditions. See Troubleshooting section for diagnostics.

TROUBLESHOOTING

See below table to diagnose alarms present on EMX.

with CTs.
Freq out of range| Frequency is below the minimum 45Hz or above the maximum 65Hz.
Voltage out of Range| Ensure system voltage does not exceed 600VAC.
Current out of Range| Replace with a larger amperage rated CT.
Neutral Current out of Range| Ensure desired voltages are being Monitored.
Frequency Deviation| Verify the settings for the nominal frequency and the threshold in the alarm menu.
Voltage Phase Loss| No dected voltage on one of more phases.
Pulse Config Error| Verify settings and consider increasing the Wh per pulse setting. User selected pulse settings violated the maximum duty cycle of the pulse output (50%), and the pulse duration setting was adjusted down by the firmware.
Pulse overrun error| Verify pulse settings and consider increasing the Wh per pulse, or decreasing the pulse duration.

If code is not shown in table above, please contact Senva technical support@senvainc.com or 866-660-8864

BACnet/Modbus Quick Reference

The following section outlines some commonly utilized Modbus registers and BACnet objects for quick reference. For a complete list and description of each, please see the associated protocol guides: EM-RS485 BACnet Protocol Guide or EM-RS485 Modbus Protocol Guide.

Supported Modbus Functions:
0x03 Read Holding Registers
0x06 Write Single Register
0x10 Write multiple Registers

SPECIFICATION

Power Supply Input| Line/High voltage mode
Power Consumption
Frequency Range| l 90-600VLL (+20%), 50/60Hz, 1-3 phase
4W Typ.
50/60 Hz
---|---|---
Output| RS-485
Baud Rates
RS-485 Loading| 2-wire, BACnet MS/TP, Modbus RTU, Modbus ASCII
9600, 19200, 38400, 57600, 76800, 115200
1/4 unit
Pulse Output| Dual Outputs
Type
Alarm Configuration
Ratings
Pulse scaling
Duration| Import & Export Energy Outputs, Alarm Status, and Pulse Input Echo
Solid state dry contact
N.O. or N.C.
40VAC/DC, 300mA Max
0.01, 0.1, 1, 10, 100, 1k Wh/Pulse
10, 25, 50, 100, 250, 500 (ms)
EMX Wiring Requirements| Conductor gauge
Terminal torque rating| 12-24 AWG; Power terminals: 12-18 AWG
0.37 ft-lb (0.50 N•m)
Pulse Inputs| Input Rating
Pulse Active
Pulse Undefined
Pulse Idle
Puse Length| 3.5 ± 0.5 VDC, short circuit current is 10mA max
<10 kOhms
10-30 kOhms

30 kOhms
Accepts Pulses >10ms
Rejects Pulses < 5ms
Service Types| Configurations
Voltages
Frequency
Measurement| 1Ph, 2Ph, 3Ph Wye (4-Wire), 3Ph Delta (3-Wire)
90VL-N through 600VL-L
45-65 Hz
CAT III
EMX Performance| Meter Accuracy
State
System Accuracy| 0.2% (ANSI C12.20 Class 0.2 standards), True RMS
Meets WA State Clean Building Bill
1% for V, A, kW, kVAR, kVA
Operating Environment| Operating Temperature
Storage Temperature
Humidity
Environmental Rating| -22 to 158ºF (-30 to 70ºC)
-40 to 185ºF (-40 to 85ºC)
0-95% non-condensing
IP20; Front display IP40
EMX Meter Enclosure| Material
Dimensions| Polycarbonate/ABS
3.55”h x 4.18”w x 2.26”d
Compliance| Agency
Standards| UL Listed, cUL Listed, File E489498
CE, RoHS

References

• Senva inc: Gas Sensors, Toxic Sensors, Dry Pressure Sensors, Wet Pressure Sensors, Humidity/Temp Sensors, Current Switches, Current Transducers, Energy Measurement, Relays, Leak Detection, IoT Solutions, Smart Sensors

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