Electronic Components; Trip Units; Overview Of Function - Siemens UL 489 Operating Instructions Manual

9

Electronic components

9.1

Trip units

9.1.1

Overview of function

Functions

Basic protective functions
Overload protection (L-tripping)
Short-time-delayed short-circuit protection (S-tripping)
Instantaneous short-circuit protection (I-tripping)
Neutral conductor protection (N-tripping)
ground-fault tripping

Additional functions (page 9-13)
Load monitoring
Pre-trip signal for long-time trip
Thermal memory can be switched on/off
Zone selective interlocking
Neutral conductor protection can be switched on/off
Short-time delayed short-circuit protection can be switched on/off
Instantaneous short-circuit protection can be switched on/off
Short-time delayed short-circuit protection switchable to I
Overload protection switchable to I
Changeable parameter sets
2
Ground-fault protection to I t
Ground-fault alarm

Display (page 9-17)
Alphanumeric display
Graphical display (fixed-mounted)
Communication
c
Communication via
Communication via PROFIBUS DP
Communication via Modbus RTU
Communication via Modbus TCP
Communication via PROFINET IO

Metering function (page 9-77)
Metering function PLUS
Parameterization
Parameterization via rotary coding switches
Parameterization via communication (absolute values)
Parameterization via menu (absolute values)
Remote parameterization of basic protective functions
Remote parameterization of additional functions
Other
Option for connecting to an external 24 V DC power supply
q standard
o optional
- not available
1
fixed
(page 9-11)
2
t
4
t
Trip Units
ETU745 ETU776
 
(9-2)
q
q
q
q
o
q
q
q
o
q
q
q
q
q
-
o
o
o
-
q
o
o
o
o
o
q
-
-
-
q
q
(9-7)
q
q
q
q
o
q
q
q
o
q
q
q
q
q
q
o
o
-
q
q
o
o
o
o
o
-
q
q
q
q
q
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