9328900990 Rev L BE1-951 Application 8-49
Logic Settings and Equations for ARSTKEY and TRSTKEY
SL-N=LATCH
SL-50TP=0,0 SL-50TN=0,0 SL-50TQ=0,0
SL-150TP=0,0 SL-150TN=0,0 SL-150TQ=0,0
SL-51P=1,0
SL-51N=1,0
SL-51Q=1,0
SL-151N=G,0
SL-27P=0,0
SL-59P=0,0 SL-59X=0,0
SL-47=0,0
SL-62=0,0,0
SL-162=0,0,0
SL-79=0,0,0,0
SL-81=0,0
SL-181=0,0
SL-281=0,0
SL-381=0,0
SL-481=0,0
SL-581=0,0
SL-BF=0,0,0
SL-GROUP=0,0,0,0,0,0
SL-43=0
SL-143=0
SL-243=0
SL-343=0
SL-101=0
SL-VOA=0
SL-VO1=0
SL-VO2=0
SL-VO3=VO14
SL-VO4=/VO14
SL-VO5=0
SL-VO6=0
SL-VO7=VO14*/TRSTKEY
SL-VO8=VO13*/ARSTKEY
SL-VO9=0
SL-VO10=0
SL-VO11=51PT+51NT+51QT+151NT
SL-VO12=51PPU+51NPU+51QPU+151NPU
SL-VO13=IN3+VO8
SL-VO14=VO11+VO7
SL-VO15=0
Alarm Latch and Pseudo Target Using the ARSTKEY Logic Variable
On occasion, the user may want the relay to annunciate and latch for a user defined condition originating
internal or external to the relay. This is accomplished by using an AND gate to latch the condition through
one of the relay's user defined alarms and the ARSTKEY logic variable to reset the latch. Virtual Outputs
VO13, VO14, and VO15 can be programmed to alarm for any BESTlogic expression. Also, they can be
assigned a user defined label up to a maximum of 10 characters that will be reported in the alarm
reporting function and appear on the relay's HMI. In the following example, the user defined alarm
condition is defined as a "pseudo target" for an external trip function. Refer to the Section 6, Reporting
and Alarm Functions.
Using the same transformer protection application as in the previous example, the user wants to trip and
lockout the high side circuit switcher for a Sudden Pressure Relay trip. The user also wants a sealed
annunciation on the HMI that reads "SPR_TRIP".
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