Rockwell Automation Publication 825-UM004D-EN-P - November 2012 89
Configuring Protection & Logic Functions Chapter 6
For application on an induction motor, it is recommended that the installer
disable the elements by setting all four Power Factor Level settings to Off.
Frequency
The 825-P provides two warning and two trip overfrequency or underfrequency
elements with independent level and time-delay settings. When an element level
setting is less than the Nominal Frequency setting, the element operates as an
underfrequency element. When the level setting is greater than the Nominal
Frequency setting, the element operates as an overfrequency element.
The relay measures system frequency for these elements using the positive
sequence voltage if the voltage input option is present. Otherwise, the relay uses
positive sequence current.
Load Control Function
Table 33 - Frequency Settings
Setting Prompt Setting Range Factory Default
FREQ1 TRIP LEVEL Off, 55.0…65.0 Hz Off
FREQ1 TRIP DELAY 0.0…240.0 s 0.0
FREQ1 WARN LEVEL Off, 55.0…65.0 Hz Off
FREQ1 WARN DELAY 0.0…240.0 s 0.0
FREQ2 TRIP LEVEL Off, 55.0…65.0 Hz Off
FREQ2 TRIP DELAY 0.0…240.0 s 0.0
FREQ2 WARN LEVEL Off, 55.0…65.0 Hz Off
FREQ2 WARN DELAY 0.0…240.0 s 0.0
NOTE: The setting range for Trip and Warn Levels shown in Table 33 are for Rated Freq. := 60 Hz. The
setting ranges are “Off, 45.0–55.0 Hz” when Rated Freq. := 50 Hz.
Table 34 - Load Control Settings
Setting Prompt Setting Range Factory Default
LOAD CONTROL SEL Off, Current, Power, TCU Off
LD CTL CUR UPPER Off, 0.20…2.00 x I
e
Off
LD CTL CUR LOWER Off, 0.20…2.00 x I
e
Off
LD CTL PWR UPPER Off, 1…25000 kW Off
LD CTL PWR LOWER Off, 1…25000 kW Off
LD CTL TCU UPPER Off, 1…99%TCU Off
LD CTL TCU LOWER Off, 1…99%TCU Off
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