ABB SACE Emax 2 Series Operating Instructions Manual page 76

OF Protection
t
f13
t13
UF2 Protection
t
f17
t17
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Function
The protection sends a TRIP command if the grid frequency read by the unit exceeds threshold f13 for
longer than t13.
OF
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:
• summary table of the protections with the operating characteristics (page 96)
• the graph with trip curve (page 108)
Parameters
f
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 f13
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 t13 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).
Function
UF2 protection functions in the same way as UF protection: the protection sends a TRIP command if the
grid frequency read by the unit drops below threshold f17 for longer than t17.
UF2
It is independent of UF protection, thus thresholds and functions of the two protections can be
programmed so as to take advantage of different plant solutions (example: signaling with UF and open
command with UF2 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.
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 95)
• 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 f17
value (Fn) and can be set within the range: 0.9 Fn to 1 Fn in 0.001
Fn steps
This is the trip time of the protection; the value is given in
Time t17
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
Default
OFF
OFF
0,9 Fn
3 s
Ekip Touch - Protections
5 - Frequency protections