IDEC SmartRelay functions
IDEC SmartRelay Manual 159
Timing diagram
Functional description
The Frequency trigger measures the signals at input Fre.
The pulses are recorded across a configurable time G_T.
Output Q is set and reset in accordance with the set thresh-
olds. See the calculation rule below.
Calculation rule
• If the On threshold ≥ Off threshold, then:
Q = 1, if f
a
> On
Q = 0, if f
a
≥ Off.
• If the On threshold < Off threshold, then Q = 1 if
On ≤ f
a
< Off.
Preset of the Par parameter
Note
The system scans the counter limit value once per interval G_T.
View in programming mode (example):
Q
Off = 5
f
a
= 9 f
a
= 10 f
a
= 8 f
a
= 4
G_T
Fre
On = 9
f
a
= Input frequency
B15 1+
On =0009
Off
=0005
Parameter protection mode
On threshold
Off threshold
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com
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