Technical description
2 Protection functions
2.7 Undervoltage protection U< (27)
VM55.EN005
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61
Figure 2.7-1.Under voltage state and block limit.
Three independent stages
There are three separately adjustable stages: U<, U<< and
U<<<. All these stages can be configured for definite time (DT)
operation characteristic.
Setting groups
There are two settings groups available for all stages.
Switching between setting groups can be controlled by digital
inputs, virtual inputs (mimic display, communication, logic)
and manually.
Parameters of the under voltage stages U<, U<<, U<<< (27):
Parameter
Value
Unit
Description
Note
Status
-
Blocked
Start
Trip
Current status of the stage
F
F
SCntr
Cumulative start counter
C
TCntr
Cumulative trip counter
C
SetGrp
1 or 2
Active setting group
Set
SGrpDI
-
DIx
VIx
LEDx
VOx
Fx
Digital signal to select the
active setting group
None
Digital input
Virtual input
LED indicator signal
Virtual output
Function key
Set