Rockwell Automation 825-P Modular Protection System for Motors User Manual - Manual (Page 66)

66 Rockwell Automation Publication 825-UM004D-EN-P - November 2012
Chapter 6 Configuring Protection & Logic Functions
Application Data Calculate the settings for the 825-P by collecting the following information
before you begin (collect the information for each speed for two-speed motor
applications):
• Specifications of the protected motor:
–
Rated full load current
– Service factor
– Locked rotor current
– Maximum locked rotor time with the motor at ambient and/or
operating temperature
– Maximum motor starts per hour
– Minimum time between motor starts
• Additional data regarding the motor application:
–
Minimum no load current or power, if known.
– Motor accelerating time. This is the normal time required for the motor
to reach full speed.
– Maximum time to reach motor full load.
• Current transformer primary and secondary ratings, if used
• System phase rotation and nominal frequency
• Voltage transformer ratios and connections, if used
• Type and location of resistance temperature devices (RTDs), if used
• Expected fault current magnitudes for motor or cable ground and three-
phase faults
Main Settings Identifier Settings
All models of the 825-P have the identifier settings described in Table 7.
Table 7 - Identifier Settings
The 825-P prints the Relay and Terminal Identifier strings at the top of responses
to serial port commands to identify messages from individual relays. Enter up to
16 characters, including capital letters A…Z, numbers 0…9, periods (.), dashes (-),
and spaces. Suggested identifiers include the location, process, circuit, size, or
equipment number of the protected motor.
NOTE: This time could be significantly longer than the motor accelerating time, particularly in
pump motor applications where the motor could run at full speed for some time before the
pump reaches full head and full load.
Setting Prompt Setting Range Factory Default
UNIT ID LINE 1 16 Characters 825-P Modular
UNIT ID LINE 2 16 Characters Prot. System