CARLO GAVAZZI DCT1 Serie Manual Del Usuario página 9

Essential information
Cable loss
DCT1 implements the cable loss correction factor, considering the resistance of the cable in the measurement of voltage and
power (and therefore also energy). They are calculated as follows:
V = V - R·l
l
meas meas
P = V * I -RI
l
meas meas meas
Thus, the cable loss correction factor allows a more accurate measurement of the actual energy that flows from the charger to the
car. Cable loss can only be set up in maintenance mode, through the dedicated procedure described above.
Easy connection
Easy connection function allows ignoring current and power direction, increasing only the positive energy meter, and not affecting
the negative one when bidirectionality is not needed. The function is:
available only for the non-certified version of the device
l
disabled by default and can be enabled using UCS or Modbus command.
l
Temperature monitoring
DCT1 monitors the temperature of the shunt constantly; through the Modbus RTU the user can control two parameters:
the temperature of the upper part of the shunt and
l
the temperature of the lower part of the shunt.
l
The shunt should never exceed 120 degrees to avoid damage to the electronic components. The temperature is measured at two
different points because the shunt can connect to conductors with different resistance.
Signature
Introduction
The signature, available in certificate versions, is a 256-bit or 384-bit data field that guarantees data authenticity. The process of
the digital signature includes three stages:
1. Generation stage: an algorithm generates a couple of correlated keys,
the private key, which is known only by the DCT1 itself, and
l
the public key, lasered on the front of the meter (QR code) and available through Modbus RTU
l
2. Authentication stage: the set of data collected by the DCT1 is signed using the private key, which asserts the authenticity of
the data,
3. Integrity stage: the data can be verified by the user only through the public key that matches the private one. Otherwise, the
system leads to an error. It guarantees the integrity of the data reported by the device.
DCT1 implements this procedure to ensure the information it reports is not corrupted by an external system because no one apart
from the DCT1 knows the private key, which is necessary to verify the authenticity of the data.
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DCT1 - User manual | 22/06/2023 | CARLO GAVAZZI Controls SpA 9