LE-03MQ CT - User manual
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1. PURPOSE
LE-03MQ CT is a static (electronic) calibrated electricity meter of single-phase or three-phase
alternating current in a direct system. It is used for reading and recording of consumed
electric energy and mains parameters with remote readout via a wired RS-485 network. The meter
works with current transformers (CT) with 1 A or 5 A secondary current. The configuration of the
meter is done through the configuration menu accessible from the front panel and the
communication port according to the software features of the Modbus RTU protocol.
2. UNIT CHARACTERISTICS
2.1. Measured value
The unit can measure and display:
line voltage and THD% (total harmonic distortion) of all phases
line frequency
currents, current demands and current THD% of all phases
power, maximum power demand and power factor
active energy imported and exported
reactive energy imported and exported
2.2. Current transformers (CT)
The meter works with current transformers (CT) with 1 A or 5 A secondary current.
The appropriate value of rate and the secondary current of the connected
transformer should be set in the meter.
For example: using a 100/5 A current transformer, you should set the secondary
current CT2 to 5 and the rate CTrate to 0020. To get the CT rate to enter you need to
divide a primary current value by the value of the secondary current (100/5 = 20).
WARNING!
The settings for the current ratio (CT2 and CT rate) and voltage ratio
(PT2 and PT rate) can only be made once. It is a legal requirement of
the MID Directive. Once set the rate cannot be changed.
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