1.1 Device Features and Model Selection
Klemsan EMD 4 series devices are MID-approved energy meters that measure and record the basic electrical
parameters necessary for monitoring a three-phase electrical system. Optionally, the devices offer:
• RS485 (Modbus RTU) communication
• Direct connection up to 100×3 Amps and CT connection
• Measurement of multiple electrical parameters in addition to kWh
• 4-quadrant energy measurement addresses
• 3 Main Tariffs
• Ability to store minimum, maximum, and demand values
• Operating time counter, on-time counter, and power interruption counter
• Digital Input
• Pulse Output
• THDV, THDI

2.1 Preparation for Installation
• Installation and connections of MED 4 series devices must be done under the instructions provided
in the user manual by authorized personnel. The device should not be operated before connections
are made correctly.
• Before connecting the device to the grid, ensure that the power is disconnected.
• Use a dry cloth to clean the device and remove dust. Do not use alcohol, thinner, or abrasive
substances.
• The device should only be powered on after all connections have been made.
• Do not open the device. There are no parts inside that users can manipulate.
• Keep the device away from humid, wet, vibrating, and dusty environments.

2.3.1 Devices with Current Transformer Connection
L1 – L2 – L3 Inputs: These are the phase inputs of the three-phase alternating voltage being measured.
N Input: This is the neutral input of the three-phase alternating voltage being measured.
k1 – k2 – k3 Inputs: These are the inputs for the three-phase alternating current being measured.
l1 – l2 – l3 Inputs: These are the outputs of the three-phase alternating current being measured.
U1-U2 Inputs: These terminals are used for supplying power to the device.
2.3.2 Devices with Direkt Bağlantılı Cihazlar
L1in – L2in – L3in Inputs: These are the inputs for the three phases being measured. The connection can
be made for up to 100A for each phase.
L1out – L2out – L3out Inputs: These are the inputs for the three phases being measured.
N Input: This is the input for the neutral connection of the line.
2.3.3 Common Connections
Pulse 1 Out ( ): This is the output terminal for the DC voltage applied to the “com” terminal when digital output 1
is active. Pulse 1 output is adjustable and provides 500 impulses (500 imp/kWh) for each kWh measured by
default. Pulse duration is 60 ms.
Pulse 2 Out ( ): This is the output terminal for the DC voltage applied to the “com” terminal when digital output 2
is active. Pulse 2 output is adjustable and provides 500 impulses (500 imp/kVArh) for each kVArh measured by
default. Pulse duration is 60 ms.
com: This is the terminal where the positive end of the DC voltage for digital switching will be connected (common).
D+: This is the data+ input of the RS-485 interface.
GND1: This is the input where the ground connection of the RS-485 interface is made
D-: This is the data- input of the RS-485 interface.
DIN1 – GND – DIN2: Desired digital input will be active when making short-circuited with GND.