Basler Electric BE1-700 - Manual (Page 213)

Table 8-21. Miscellaneous Logic Expressions
Command Reference
SA-RESET
Section 6, Reporting and Alarm Functions, Alarms Function
SB-DUTY
Section 6, Reporting and Alarm Functions, Breaker Monitoring
SB-LOGIC
Section 6, Reporting and Alarm Functions, Breaker Monitoring
SG-TARG
Section 6, Reporting and Alarm Functions, Fault Reporting
SG-TRIGGER
Section 6, Reporting and Alarm Functions, Fault Reporting
SP-79ZONE
Section 4, Protection and Control
APPLICATION TIPS
Output Contact Latch Using the TRSTKEY Logic Variable
On occasion, an application will call for latching an output contact such as simulating a lockout (86)
function. Each output contact of a Basler Electric relay can be set to latch by using an AND gate to seal
the trip condition and the TRSTKEY logic variable to reset the latch.
As an example, assume a BE1-700 is used for overcurrent protection of a radial transformer shown in
Figure 8-11, Station One-line Drawing. The user wants to trip and lockout the high side circuit switcher for
an overcurrent trip.
Referring to Figure 8-12, a 51 or 151 trip will causeVO11 to go high. This in turn causes VO14 to go high,
sealing the inputs of VO3 and VO4 through AND gate VO7. This allows Output Contacts 3 and 4 to
transition and remain in that state until the TRSTKEY variable is asserted. In this example, the circuit
switcher will be tripped by Output 3 (simulating an 86
Aa@) and its close circuit disabled by Output 4
(simulating an 86 Ab@). The HMI LCD display automatically goes to the Target Screen per the automatic
display priority function. When the operator presses the Reset key while the LCD display is on the Target
Screen (Reset key of the HMI is context sensitive), the TRSTKEY logic variable goes high breaking the
VO7 seal in at which point Output 3 will open and Output 4 will close. Refer to Section 6, Reporting and
Alarm Functions, Fault Reporting.
The data in Table 8-22 include the logic settings and equations for the ARSTKEY and TRSTKEY
functions.
9376700990 Rev M BE1-700 Application 8-31