Woodward HighPROTEC - Page 19

IMPORTANT DEFINITIONS
19 MCDGV4 DOK-HB-MCDGV4-2E
And Or Negated input Negated output Band-pass (filter) IH1 Band-pass (filter) IH2 Quotient of analogue values
1
CB.t-TripCmd
t
Analog values
S 1 R1 1
a
b
c
d
RS flip-flop a b c d 0 0 Unchanged 0 1 0 1 1 0 1 0 1 1 0 1
Time stage: A "1" at the input starts the stage. If the time <name>.t is expired the output becomes "1" too. The time stage will be reset by "0" at the input. Thus the output will be set to "0" at the same time. Time stage minimum pulse width: The pulse width <name>.t will be started if a "1" is feed to the input. By starting <name>.t the output becomes "1". If the time is expired, the output becomes "0" independent from the input signal.
IH1 IH2 IH2 IH1
=1
Exclusive-OR Analogue values comparator
+ R
+ increment R Reset Edge triggered counter
t1
Delay Timer
t2
t1: Switch On Delay t2: Switch Off Delay
Delay Timer
t1
t2
t1
t2
>1
&
+ R
+ increment R Reset
Counter increments with every rising edge. Output will be set as long as n<N.
n<N