Siemens WL Series Operating Instructions Manual page 348

WL Circuit Breaker
Function Overview of the Electronic Trip Units
Basic Functions
Long-time overcurrent protection
Function can be switched ON/OFF
Setting range I R = I n x ...
Switch-selectable overload protection
I n
( I 2 t or I 4 t dependent function)
L
Setting range of time delay class t R at I 2 t
(seconds)
Setting range of time delay t R at I 4 t
(seconds)
Thermal memory
Phase loss sensitivity
N-conductor protection
N
Function can be switched ON/OFF
N-conductor setting range I N = I n x ...
Short-time delayed overcurrent protection
Function can be switched ON/OFF
Setting range I sd = I n x ...
Setting range of time delay t sd , fixed
S
(seconds)
Switch-selectable short -time delay
short-circuit protection
( I 2 t dependent function)
Setting range of time delay t sd at I 2 t
(seconds)
Zone Selective Interlocking (ZSI) function
Instantaneous overcurrent protection
Function can be switched ON/OFF,
Extended Instantaneous Protection
I
is enabled when OFF
Setting range I i = I n x ...
Ground fault protection
Trip and alarm function
Detection of the ground fault current
by residual summing method
Detection of the ground fault current
by direct summing method
Setting range of the I g for trip
G
Setting range of the I g for alarm
Setting range of the time delay t g
(seconds)
Switch-selectable
ground fault protection
( I 2 t / fixed)
Setting range time delay t g at I 2 t
ZSI ground function
1 Extended Instantaneous Protection (EIP) allows the WL breaker to be applied at the withstand rating of
the breaker with minus 0% tolerance; that means no instantaneous override whatsoever. EIP further
enables the circuit breaker to be applied up to the full instantaneous rating of the breaker on systems
where the available fault current exceeds the withstand rating.
Ground Fault Module cannot be removed after installation.
2
Notes:
M = Motor protection setting (20 ms)
Communications = Setting the parameters of the trip unit
via the Breaker Data Adapter, MODBUS, or PROFIBUS
Key pad = Direct input at the trip unit
25 – 9
ETU748
✔
–
0.4, 0.45, 0.5, 0.55,
0.6, 0.65, 0.7, 0.8,
0.9, 1
✔
2, 3.5, 5.5, 8, 10,
14, 17, 21, 25, 30
1, 2, 3, 4, 5
✔
(via slide switch)
at t sd =20ms (M)
–
–
–
✔
✔
(via rotary switch)
1.25, 1.5, 2, 2.5,
3, 4, 6, 8, 10, 12
M, 0.1, 0.2, 0.3, 0.4
✔ (via rotary switch)
0.1, 0.2, 0.3, 0.4
per CubicleBUS module
✔
–
– I = I = EIP
i cw
2
(field installable module)
O
✔
✔
✔
A, B, C, D, E
A, B, C, D, E
0.1, 0.2, 0.3, 0.4, 0.5
✔
0.1, 0.2, 0.3, 0.4, 0.5
per CubicleBUS module
ETU755
✔
–
0.4 ... 1 (step: 1A)
✔(via communications)
2 ... 30 (step: 0.1s)
1 ... 5 (step: 0.1s)
✔
(on/off via communications)
✔
(on/off via communications)
✔
✔ (via slide switch)
1
✔
✔
(via communications)
1.25 ... 0.8 x I cw = max
(step: 10A)
M, 0.08 ... 0.4, OFF (step: 0.001s)
✔
(via communications)
0.1 ... 0.4 (step: 0.001s)
per CubicleBUS module
✔
✔
(via communications)
1
1.5 x I ... 0.8 x I = max, OFF= I
n cs
(field installable module)
O
✔
(via communications)
✔
✔
A ... E (step: 1A)
A ... E (step: 1A)-
0.1 ... 0.5 (step: 0.001s)
✔
0.1 ... 0.5 (step: 0.001s)
per CubicleBUS module
ETU776
✔
–
0.4 ... 1 (step: 1A)
✔
2 ... 30 (step: 0.1s)
1 ... 5 (step: 0.1s)
✔
(on/off via key pad
or communications)
✔
(on/off via key pad
or communications)
✔
✔ (via slide switch)
0.5 ... 1
✔
✔
(via key pad or communications)
1.25 ... 0.8 x I cw = max
(step: 10A)
M, 0.08 ... 0.4, OFF (step: 0.001s)
✔
(via key pad or communications)
0.1 ... 0.4 (step: 0.001s)
per CubicleBUS module
✔
✔
(via key pad or communications)
1 1.5 x I ... 0.8 x I = max, OFF= I
=EIP
cw
n cs
(field installable module)
O
✔
(via key pad or communications)
✔
✔
A ... E (step: 1A)
A ... E (step: 1A)
0.1 ... 0.5 (step: 0.001s)
✔
0.1 ... 0.5 (step: 0.001s)
per CubicleBUS module
✔ available
– not available
optional
O
=EIP
cw