KWH-400 Tyco Electronics, KWH-400 Datasheet - Page 2

• Manufacturer Part Number: KWH-400
• Description: KWH METER, 3 PHASE
• Manufacturer: Tyco Electronics

Specifications of KWH-400

• Meter Function: Kilowatt Hour Energy
• Meter Size/dimensions: 96mm X 96mm X 82mm
• External Depth: 82mm
• External Length / Height: 96mm
• External Width: 96mm
• Ip/nema Rating: IP 54
• Input Voltage Max: 400V
• Operating: RoHS Compliant

Features
Class 1.0 accuracy
Wide operating voltage 85V to 500V L-L
3 phase 3 and 4 wire
True RMS measurement
6 digit auto-resettable
electro-mechanical counter
LED status and diagnostic indicators
Pulsed output
Fully programmable CT ratios
DIP switch settings
Fully isolated current input
Benefits
Replaces the need for rotating
disc meters
Energy efficiency and awareness
Industry standard DIN96 case style
Tamper proof
Low VA burden
Applications
Switchgear
Distribution systems
Generator Sets
Control panels
Embedded generation
Energy management
Building management
Utility power monitoring
Process control
Motor monitoring
Compliant With
IEC 1036
KWH-400 – DIN Panel Mounted Kilowatt Hour Energy Meter
This innovative self contained 96mm DIN panel mounted kilowatt hour meter
measures the real consumption of active energy to Class 1.0 accuracy, displayed via a
6 digit auto-resetting electro-mechanical counter. The unit also provides status and
diagnostic information via LED indicators on the front panel, and incorporates an
integral pulsed output for communication of energy usage. The KWH-400 unit is
designed for connection to either 3 phase 3 wire, or 3 phase 4 wire unbalanced loads
and is ideal for secondary metering in switchgear, plant instrumentation and process
control applications, offering considerable advantages over traditional rotating disc
type kilowatt hour meters.
Operation
This class 1.0 instrument uses microprocessor controlled circuitry for optimum
performance and accuracy. The unit takes the incoming voltage and current signals
and converts them into numbers representing the instantaneous values. These are
then multiplied together to give the instantaneous power. This sampling is repeated
many times during each cycle of the waveform, which allows accurate true RMS
measurement of distorted waveforms. These values are accumulated until enough
energy has been measured to increment the counter by one digit. The electro-
mechanical counter is auto-resetting, and will reset to 000000 from 999999.
3 Phase Voltage Status
The unit incorporates one green ‘ON’ LED for each voltage phase. Three illuminated
LEDs indicate active monitoring of each of the three phases. In the event of a missing
phase voltage, the appropriate LED will switch off, however, the meter will continue
to accurately measure energy for the available voltage phases. A flashing green LED
indicates incorrect phase sequence connection, and wiring should be checked. The
meter will not give accurate readings if the phase sequence is incorrect.
Reverse Connected Current Transformers
For each of the three phases, a red ‘REV’ LED will illuminate to indicate a reverse
connected CT. The wiring should be checked, but the meter will continue to
accurately register the energy consumption even if the CTs are reverse connected.
Pulse Indicator
The unit features a dedicated red LED pulse indicator which flashes at a rate
proportional to the measured power.
Pulsed Outputs
The KWH-400 unit features an integral pulsed output, pulsed at a rate proportional to
the measured energy, and connected via screw clamp terminals. The pulse rate scales
appropriately to the CT settings. The re-transmission of kW.h time based energy
status to TTL circuits, CMOS circuits or management systems is achieved via the fully
volt free opto-isolator open collector transistor output. A pull-up resistor will be
required, and it is advisable to use a Schmitt Trigger input for TTL.
Current Transformers
To enable the safe and simple measurement of AC current, the KWH-400 unit requires
a current transformer to be fitted to each of the three phases. Crompton Instruments
offers an extensive range of suitable current transformers offering accurate
measurement of AC current and ratio matching to a consistent 5 Amp secondary
current, proportional to the primary current. See attached list for standard values.
Dimensions