CIRCUTOR CDP-0 - Manual (Page 15)

CDP
Instruction Manual 15
4.- OPERATION
4.1.- OPERATING PRINCIPLE
One of the main features of the CDP is that it can measure all the energy flows
of the installation:
 Energy consumed by the user.
 Energy generated by the inverter.
 Energy consumed or injected into the grid.
The inverter power must be configured in the unit and, through a
communications channel, the CDP can adapt generation to energy consumption
with the aim of achieving zero grid injection
The CDP generates a database with all the power and energy information for
every measuring point, including the inverter's regulation percentage.
The following functions have also been implemented in the CDP:
•
Grid injection alarm control.
•
Management of non-critical loads, CDP-G model.
4.1.1. DESCRIPTION OF THE MEASUREMENT SYSTEM
The CDP measures the user's voltage and current and uses these values to
calculate the consumed power. If the power generated by the inverter differs
from that consumed, the unit changes the inverter's working setpoint to adjust it
to the real-time needs of the installation.
4.1.2. OPERATION OF THE GRID INJECTION PROTECTION RELAY
If measuring the power consumed from the grid, both in single-phase and three-
phase installations, the CDP can control a redundant grid current injection
protection relay. Relay number 4 is used for this function, by default the relay
status is NC (terminals 9-10).
Table 10 describes the parameters that can be configured in the CDP in relation
to the control tasks of this function: