Siemens SENTRON 3WL10 Series Manual page 58

Description
2.4 Electronic trip unit ETU
Electronic trip units of the 6-series
Protection functions of the ETU
L LT: Overload protection
Protection function can be enabled/disabled
Setting range of operating value I
Setting range for delay time t
(reference point 6 x I
Switchable overload protection characteristic
IEC 60255-151
t =(t ∙b)/((I
trip r load
Setting range for delay time t
IEC 60255-151
(reference point 6 x I
Thermal memory can be enabled/disabled
Overload pre-alarm
56
= I x ...
r n
at I²t
r
)
n
/I )^ -1)
α
r
for characteristic
r
)
n
ETU650 LSI
Via rating plug "L = off"
0.4 to 1 (in steps of 0.001)
Default value: 1
Tolerance : Tripping
1)
between 1.05 and 1.2 x I
r
0.75 to 36 s (in steps of 0.25)
Default value: 36 s
Tolerance :
1)
± 10 % I ≤ 6 x I
n
± 20 % I > 6 x I
n
I t: α=4, b=1296
4
standard inverse SI: α=0.02,
b=0.0364
very inverse VI: α=1, b=5
extremely inverse EI: α=2,
b=35.2
Default value: I²t
0.75 to 5 s (in steps of 0.25)
Default value: 5 s
Tolerance :
1)
± 10 % I ≤ 6 x I
n
± 20 % I > 6 x I
n
●
50 to 100 % x I (in steps
r
of 1%)
Default value: 90 %;
ETU660 LSIG
Via rating plug "L = off"
0.4 to 1 (in steps of 0.001)
Default value: 1
Tolerance : Tripping
1)
between 1.05 and 1.2 x I
0.75 to 36 s (in steps of 0.25)
Default value: 36 s
Tolerance :
1)
± 10 % I ≤ 6 x I
n
± 20 % I > 6 x I
n
I t: α=4, b=1296
4
standard inverse SI: α=0.02,
b=0.0364
very inverse VI: α=1, b=5
extremely inverse EI: α=2,
b=35.2
Default value: I²t
0.75 to 5 s (in steps of 0.25)
Default value: 5 s
Tolerance :
1)
± 10 % I ≤ 6 x I
n
± 20 % I > 6 x I
n
●
50 to 100 % x I (in steps
r
of 1%)
Default value: 90 %;
Air circuit breaker 3WL10
Manual, 11/2017, L1V30499596002-01
r