B
Control Equations & Relay Logic
SIMPRO-100
148 PRIM-2400C
B.9.2 Unlatch Trip
Following a fault, the trip signal is maintained until
all of the following conditions are true:
• Minimum Trip Duration Time (TDURD)
passes
• The TRIP control equation result deasserts to
logical 0
• All the motor lockout functions, described
below, deassert to logical 0
• One of the following occurs:
– Unlatch Trip control equation setting
ULTRIP asserts to logical 1
– The front-panel Trip/Target Reset menu
item is selected
– The serial port TARGET R (Target Reset)
command is executed
– The Modbus Reset control command is
executed
– An Emergency Restart command is
executed or the EMRSTR control
equation setting asserts to logical 1
Figure B.7 Stop/Trip Logic
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