ABB SACE Emax 2 Series Operating Instructions Manual page 69

OV Protection
t
U9
t9
UV2 Protection
t
U15
t15
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Function
The protection sends a TRIP command if one or more line-to-line voltages detected by the unit exceed
threshold U9 for longer than t9.
OV
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 106)
Parameters
Parameter Description
V
Activates/deactivates the protection and its availability in the
Enable
parameters menu
Activates/deactivates transmission of the open command: if disabled,
Trip Enable the alarm and exceedance of protection time are only managed as
information
Establishes the value that activates the protection.
Threshold
The value is given as both absolute value (Volts) and relative value (Un)
U9
and can be set within the range: 1 Un to 1.5 Un in 0.001 Un steps
This is the trip time of the protection; the value is given in seconds
Time t9
and can be set within a range: 0.05 s to 120 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).
Function
UV2 protection functions in the same way as UV protection: the protection sends a TRIP command if one
or more line-to-line voltages detected by the unit drop below threshold U15 for longer than t15.
UV2
It is independent of UV protection, thus thresholds and functions of the two protections can be
programmed so as to take advantage of different plant solutions (example: signaling with UV and open
command with UV2 or vice versa, or both for signaling or tripping).
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)
v
• the graph with trip curve (page 105)
Parameters
Parameter Description
Activates/deactivates the protection and its availability in the
Enable
parameters menu
Activates/deactivates transmission of the open command: if disabled,
Trip Enable
the alarm and exceedance of protection time are only managed as
information
Establishes the value that activates the protection.
Threshold
The value is given as both absolute value (Volts) and relative value (Un)
U15
and can be set within the range: 0.05 Un to 1 Un in 0.001 Un steps
This is the trip time of the protection; the value is given in seconds
Time t15
and can be set within a range: 0.05 s to 120 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).
ABB | SACE Emax 2
Default
OFF
OFF
1,05 Un
5 s
Default
OFF
OFF
0,9 Un
5 s
Ekip Touch - Protections
3 - Voltage protections