GE D90 Plus Instruction Manual page 476

AUTOMATION LOGIC
About automation timers
466
Figure 408: Using comparators to verify approximate equivalence
Unlike earlier versions of the D90
latches and not through the specific setting menus. Automation timers have the following
syntax:
TIMER (IN, PKP, DPO).
A timer accepts any digital input or the output of any logical operator as its
The timer output is asserted when its input is asserted for a time equal to or greater than
the parameter. Likewise, the timer output will reset when its input has been reset for a
PKP
time equal to or greater than its
For example, the following logic produces an output that will pickup 10 seconds after
contact input F1 closes and will dropout 1 second after the contact opens.
Figure 409: Using an automation timer
Virtual analogs can also be assigned to control the pickup and dropout of timers. In the
following example, two virtual analogs are used to define the pickup and dropout of two
different timers.
Plus
, automation timers are implemented like gates or
parameter.
DPO
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 8: AUTOMATION
parameter.
IN