ABB SACE Emax 2 Series Operating Instructions Manual page 77

OF2 Protection
t
f18
t18
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Function
OF2 protection functions in the same way as OF protection: the protection sends a TRIP command if the
grid frequency read by the unit exceeds threshold f18 for longer than t18.
OF2
It is independent of OF protection, thus thresholds and functions of the two protections can be
programmed so as to take advantage of different plant solutions (example: signaling with OF and open
command with OF2 or vice versa, or both for signaling or tripping).
The protection excludes itself if the maximum value of the line-to-line voltage is less than 30 V.
To check and simulate the trip times in relation to all the parameters, please consult:
f
• summary table of the protections with the operating characteristics (page 96)
• the graph with trip curve (page 108)
Parameters
Parameter Description
Activates/deactivates the protection and its availability in the
Enable
parameters menu
Activates/deactivates transmission of the open command: if
Trip Enable disabled, the alarm and exceedance of protection time are only
managed as information
Establishes the value that activates the protection.
The value is given as both absolute value (Hertz) and relative
Threshold f18
value (Fn) and can be set within the range: 1 Fn to 1.1 Fn in 0.001
Fn steps
This is the trip time of the protection; the value is given in
Time t18 seconds and can be set within a range: 0.06 s to 300 s, in 0.01 s
steps
Limitations and additional functions
The block functions can also be accessed by means of the service connector (via Ekip Connect) or by
connection to the system bus (page 86).
ABB | SACE Emax 2
Default
OFF
OFF
1,1 Fn
3 s
Ekip Touch - Protections
5 - Frequency protections