CGCOMMUNICATIONS GUIDE MEMORY MAP
369 MOTOR MANAGEMENT RELAY – COMMUNICATIONS GUIDE CG45
• True RMS values of the Phase A, B and C Currents (Ia, Ib, and Ic).
• True RMS value of the Ground current (Ig).
• Current Unbalance (%).
• True RMS values of the Phase A-N, B-N, and C-N voltages (Van, Vbn, and Vcn) if
VT
CONNECTION TYPE
is set to Wye.
True RMS values of the Phase A-B, B-C and C-A voltages (Vab, Vbc, and Vca) if
VT
CONNECTION TYPE is set to Delta.
• Thermal Capacity Used (%).
•Frequency.
• Breaker/Contactor Contact Input Status
• Motor Speed (low/high).
1 second of pre-trigger data and 29 seconds of post-trigger data are recorded. The data
logger ignores all subsequent triggers and continues to record data until the active record
is finished.
A total of 6 logs are stored in the relay. Log #1 is the baseline log, it is written only by the
first start after clearing the
MOTOR START DATA LOGGER (see the 369 Instruction Manual,
chapter 5: Clear/Preset Data). Logs #2 to 6 are rolling buffers of the last 5 motor starts.
Each new log automatically shifts the rolling buffer and overwrites the oldest log, #2.
Log files are formatted using CSV (comma delimited values). The files can be downloaded
and displayed via EnerVista 369 Setup software. All files are stored in non-volatile memory;
information is retained when power to the relay is lost.
6.6 Data Logger
The Data Logger allows up to 16 channels of data parameters (refer to Modbus format
code F189 for the available parameters) to be continually recorded at a defined rate of
between 1 and 3600 seconds. The 369 has allocated 32k bytes of RAM for Data Log
storage. All data will be lost upon loss of the 369 control power.
Internal to the 369, the memory structure is partitioned into 256 blocks containing 64 two-
byte registers. Blocks 0 and 1 have been allocated for the Header data, and Blocks 2-255
have been allocated to the logged data. In order to access the Log data and read it via the
"Data Logger Data" Modbus addresses 0x3281 to 0x32C0, a Block index value is stored to
the Data Log Memory Access Block Number at Modbus address 0x1E23. The data obtained
from the Data Logger Data registers will differ depending on the Block index value stored.
Each entry into a Data Log is called a Record. The Record size will vary in size depending
upon the how many channels the user wishes to use. In addition to the actual logged data
itself, the Data Logger contains what is called the Header, which can be read from Modbus
address 0x3200 to 0x3278. The Data Log Header contains the following read-only
information:
• Log Time Interval: This is the interval at which the data log will store entries (1~3600s).
• Log Record Size: This is the size of each Record entry into the Data Log. It is based
upon how many channels have been selected to use.
• Log Total Possible Records: This value indicates the maximum number of potential
records available, which depends on the record size.
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