Siemens SENTRON 3WL10 Manual page 84

Description
2.8 Electronic trip unit ETU
Measured values of the ETUs of the 3-series
Maintenance displays
Information on the last 30 trips
Information on the last 200 events
Number of mechanical switching operati-
ons
1)
Total number of trips
Operating hours counter
Contact wear
Date of maintenance performed
Direction to perform necessary mainte-
nance
Key data
Self-diagnostics
Open-circuit detection
Watchdog: constant CT monitoring, moni-
toring of the electronics and tripping coil
Temperature (T)
If auxiliary power supply is connected
1)
Metering functions of the ETUs of the 6-series
The electronic trip units of the 6-series can be expanded with the metering functions
MF Basic or MF Advanced. These measure the voltage between the phases with internal
voltage tap - optionally on the incoming or outgoing feeder side, i.e. internally before or after
the contact interruption point - and can therefore calculate and transmit values for power,
energy, phase difference, etc., taking the current signals into consideration.
● MF Basic provides many measured values in accordance with IEC 61557-12
● MF Advanced provides not only the measured values described but also many enhanced
protection functions, which are listed in Chapter Parameters of the trip units (Page 72). In
this way, the ETU can also power the metering module MF Advanced directly from the
busbar itself if no auxiliary power supply is provided via the Breaker Connect module.
Faults such as overvoltages in the power system can therefore be detected before the
contacts of the circuit breaker are closed.
82
Parameter
Type of protection function, fault values, and time stamp
Type of event, time stamp
No. Can be assigned to alarm
No. —
h —
% Pre-alarm > 80%
Alarm = 100%
Last
––
Type of circuit breaker, name assigned to the device, serial number
Parameter
Alarm due to dis-
connection Current
transformer, rating
plug, tripping coil
Pre-alarm and alarm
due to overheating
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Precision
Optional: Only alarm or tripping of the circuit
breaker
Manual, 10/2018, L1V30499596002-01