Rockwell Automation Publication 857-QS001B-EN-P - April 2017 29
Chapter 4
Installation
Step 1: Gather Required
Information
Before you apply power to the 857 Protection System for the first time, you
must obtain the specific information about your application.
• Selection of the appropriate protective mode for the 857 Protection
System: Motor or Feeder protective mode.
• The motor (feeder) nameplate data to determine your protective
functions and I/O.
• Obtain the current transformer and, if applied, voltage transformer data.
• The wiring configuration to the input and output relays on the
Protection System to determine the alarm and trip function
annunciation.
Step 2: Review Required
Information
Review the minimum required information from Step 1 to verify the
requirements for the protective parameters before powering up your Protection
System. The required data and protective elements that are selected varies
depending on the connected load and the application mode selected.
This minimum data is critical for the selection of the proper minimum initial
protective settings in the Protection System.
Table 14 - Typical Minimum Motor-protection Applications Data
Motor/ Device ID Motor 33
Motor Full Load Current For example, 80 A
Motor Locked Rotor Current 490 A
Current Transformer Primary amps 100
Current Transformer Secondary amps 5
Voltage Transformer Primary Voltage 4160
Voltage Transformer Secondary Voltage 120
Ground Fault CT Primary amps 100
Ground Fault CT Secondary amps 1
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