Page 54 - MCCB-XT2-XT4

ABB | SACE Tmax XT

5 - Frequency protections

List The Frequency protections, available by default for the Ekip Hi-Touch and Ekip M Touch models and
configurable in the remaining models as additional SW package, are:
Name Type of protection Page
UF Minimum frequency 52
OF Maximum frequency 53
UF2 Minimum frequency 53
OF2 Maximum frequency 54

UF Protection Function
The protection sends a TRIP command if the grid frequency read by the unit drops below threshold f12
t for longer than t12.
UF
f12 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:
t12 • summary table of the protections with the operating characteristics (page 76)
• the graph with trip curve (page 88)
f 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
Trip Enable disabled, the alarm and exceedance of protection time are only OFF
managed as information
Establishes the value that activates the protection.
The value is given as both absolute value (Hertz) and relative
Threshold f12 0,9 Fn
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 t12 seconds and can be set within a range: 0.06 s to 300 s, in 0.01 s 3 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 70).

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