Recorded Values Of The Latest Eight Faults - Allen-Bradley Rockwell Automation 857 User Manual

Table 3.30 – Parameters of the under voltage stages U<, U<<, U<<< (27) (cont.)
Parameter Value
Force Off
On
MinU
U<, U<<,
U<<<
U<, U<<,
U<<<
t<, t<<, t<<<
LVBlk
RlsDly
Hyster Default 3.0
%
For details of setting ranges, see "Protection Stages" in Chapter 10.
Set = An editable parameter (password needed)
C = Can be cleared to zero
F = Editable when force flag is on

Recorded values of the latest eight faults

Detailed information is available on the eight latest faults for each of
the stages: Time stamp, fault voltage, elapsed delay, voltage before
the fault and setting group.
Table 3.31 – Recorded values of the undervoltage stages (8 latest faults)
U<, U<<, U<<< (27)
Parameter Value
yyyy-mm-dd
hh:mm:ss.ms
Flt
EDly
PreFlt
SetGrp 1
2
Protection Functions
Unit Description
Force flag for status forcing for test
purposes. This is a common flag for
all stages and output relays, too.
Automatically reset by a 5-minute
timeout.
V The supervised minimum of line-to-line
voltages in primary volts
V Pick-up value scaled to primary value
%Un Pick-up setting
S Definite operation time
%Un Low limit for self blocking
S Release delay (U< stage only)
% Dead band setting
Unit Description
Time stamp of the recording, date
Time stamp, time of day
%Un Minimum fault voltage
% Elapsed time of the operating time setting.
100% = trip
%Un Supervised value before fault, 1 s average
value.
Active setting group during fault
3-55
Note
Set
Set
Set
Set
Set
Set
857-UM001A-EN-P – July 2009