Parker 690+ series - Page 139

Programming Your Application 1-131
690+ Series Frequency Inverter
Operation Description
PULSE TRAIN
Creates a pulsed FALSE / TRUE output of programmable frequency.
INPUT A enables the pulse train when TRUE, disables when FALSE.
INPUT B sets the length of the on part of the pulse in seconds (1 = 1
second). INPUT C sets the length of the off part of the pulse in seconds (1 =
1 second).
WINDOW
This function outputs TRUE when INPUT A is within a programmable
range, and FALSE otherwise.
INPUT B sets the threshold of the window to be monitored. INPUT C
defines the range of the window around the threshold. When the value of
INPUT A is inside the window, the window expands by 0.01 to avoid flutter
on output if noisy, i.e. if INPUT B = 5 and INPUT C = 4 then the range is 3
to 7, expanded to 2.5 to 7.5 when the value if INPUT A is inside the window.
If INPUT C is set to zero, the output will only be TRUE if INPUT A is
exactly equal to INPUT B (this is fulfilled in the default condition when
inputs A, B & C are all zero)
If INPUT C is set to a negative value, its absolute value defines the window
range, and the output is inverted.
input_a
output
ON time (input_b)
OFF time (input_c)
input A
output
input B threshold
input C window width
input C +ve
input C -ve