Rockwell Automation 825-P Modular Protection System for Motors User Manual - Manual (Page 105)

Rockwell Automation Publication 825-UM004D-EN-P - November 2012 105
Chapter
7
Metering & Monitoring
Overview The 825-P relay includes metering functions to display the present values of
current, voltage (if included), and RTD measurements (from the external 825-
PR12D Module). The relay provides the following methods to read the present
meter values:
• Rotating front panel display
• Front panel menu
• Front panel EIA-232 serial port
• Network port (if installed)
• Analog output
For monitoring and preventive maintenance purposes, the 825-P provides a
motor operating statistics report, available using either the front panel, the serial
port, or the optional network port.
Metering The 825-P meter data falls into the following categories:
• Instantaneous metering
• Thermal metering
–
Thermal model metering
– RTD metering
Note that the phases and neutral are identified by 1, 2, 3, N for currents and A, B,
C, N for voltages.
Table 46 details each of the meter data types in the 825-P. Chapter 3: Front Panel
Operation and Chapter 5: Using MPS Explorer describe how to access the
various types of meter data using the relay front-panel and communications ports.