Siemens SENTRON 3VL - Page 131

Displays and operator controls
9.2 Overcurrent trip unit with LCD display
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
131
BOTTOM OF LIST
= NO
DATA
ex: 3VL93256CP35 ; I
n
= 250 A , I
r
= 100 A
TOP OF LIST
CHANGE PROTECTION
CONTINUOUS AMPS SETTING 100 AMP
CONTINUOUS AMPS SETTING 250 AMP
CONTINUOUS AMPS
TRIP CLASS SETTING = 30
TRIP CLASS SETTING = 5
TRIP CLASS
CHANGE SAVED
CHANGE NOT SAVED
UNBALANCE AMPS SET TO 50%
CHANGE SAVED
CHANGE NOT SAVED
THERMAL MEMORY IS OFF
THERMAL MEMORY IS ON
CHANGE SAVED
CHANGE NOT SAVED
PREALARM IS OFF
PREALARM IS ON
PREALARM ENABLE
CHANGE SAVED
CHANGE NOT SAVED
PREALARM SET AT 80 AMPS
PREALARM SET AT 100 AMPS
TOP OF LIST
THERMAL MEMORY
PREALARM
= NO
= NO
= NO
= NO
= NO
= YES
= YES
= YES
= YES
= YES
= YES
SAVE CHANGES ?
SAVE CHANGES ?
SAVE CHANGES ?
SAVE CHANGES ?
SAVE CHANGES ?
SAVE CHANGES ?
CHANGE SAVED
CHANGE SAVED
CHANGE NOT SAVED
CHANGE NOT SAVED
DATA
DATA
DATA
DATA
DATA
CHANGE SAVED
CHANGE NOT SAVED
INSTANTANEOUS CURRENT = 312 AMPS
INSTANTANEOUS CURRENT = 2750 AMPS
IOC AMPS
= NO
= YES
SAVE CHANGES ?
DATA
UNBALANCE
UNBALANCE AMPS SET TO 5%
Figure 9-5 Example: Changing the type of the protection of the LCD-ETU 40 M
Commissioning
The overcurrent trip unit must be activated before it can be parameterized. A minimum load
current of approximately 20% of the relevant rated current I
n
of the circuit breaker is required.
The "LCD-ETU" trip unit is preset in the factory with the maximum settings for the overload
release and the short-circuit release. This means activation, and hence parameterization, is
possible when a load is connected with a minimum current of approximately 20% of the
relevant rated current 'I
n
'.
Changing the parameters for the overload and short-circuit releases during operation to a
value under the present operating value causes instantaneous tripping.
If this minimum load current is not available, the required auxiliary power can be supplied
using the 3VL9000-8AP00 hand-held tester. In circuit breakers with communication
capability, the trip unit is supplied with power by the COM10.