Eight Independent Stages; Setting Groups - Allen-Bradley Rockwell Automation 857 User Manual

Eight Independent Stages

The relay has eight independent programmable stages. Each
programmable stage can be enabled or disabled to fit the intended
application.

Setting Groups

There are two settings groups available. Switching between setting
groups can be controlled by digital inputs, virtual inputs (mimic
display, communication, logic) and manually.
There are two identical stages available with independent setting
parameters.
Table 3.45 – Parameters of the Programmable Stages PrgN (99)
Parameter Value
Status -
Blocked
Start
Trip
SCntr
TCntr
SetGrp 1 or 2
SGrpDI
-
DIx
VIx
LEDx
VOx
Force Off
On
Link (See table
above)
(See table
above)
Cmp
>
<
Pickup
Pickup
t
Hyster
NoCmp
Set = An editable parameter (password needed)
C = Can be cleared to zero
F = Editable when force flag is on
Protection Functions
Unit Description
Current status of the stage
Cumulative start counter
Cumulative trip counter
Active setting group
Digital signal to select the active
setting group
None
Digital input
Virtual input
LED indicator signal
Virtual output
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.
Name for the supervised signal
Value of the supervised signal
Mode of comparison
Over protection
Under protection
Pick up value scaled to primary level
pu Pick up setting in pu
s Definite operation time
% Dead band setting
pu Minimum value to start under
comparison. (Mode='<')
3-73
Note
F
F
C
C
Set
Set
Set
Set
Set
Set
Set
Set
Set
857-UM001A-EN-P – July 2009