Page 73 - Sace Emax 2 Manual for design engineers

ABB | SACE Emax 2
OF2 Protection Function
OF2 protection functions in the same way as OF protection: the protection sends a TRIP command if the grid
t frequency read by the unit exceeds threshold f18 for longer than t18.
f18 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).
t18
The protection excludes itself if the maximum value of the line-to-line voltage is less than 30 V.
f To check and simulate the trip times in relation to all the parameters, please consult:
• summary table of the protections with the operating characteristics (page 93)
• the graph with trip curve (page 105)
Parameters

Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable OFF
parameters menu
Activates/deactivates transmission of the open command: if disabled,
Trip Enable the alarm and exceedance of protection time are only managed as OFF
information
Establishes the value that activates the protection.
Threshold f18 The value is given as both absolute value (Hertz) and relative value (Fn) 1,1 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 seconds and
Time t18 3 s
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 83).

71 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Ekip Touch - Protections | 5 - Frequency protections