User Manual

Q
Off = 5
f
a
= 9 f
a
= 10 f
a
= 8 f
a
= 5
G_T
Fre
On = 9
f
a
= Input frequency
IDEC SmartRelay functions
IDEC SmartRelay Manual 169
Timing diagram
Functional description
The frequency trigger measures the signals at input Fre. The
pu
lses are recorded across a configurable time G_T.
Output Q is set and reset in accordance with the set
thr
esholds. 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.
Setting the Par parameter
Note
The system scans the counter limit value once per interval G_T.
View in programming mode (example):
B15 1+
On =0009
Off =0005
Parameter protection mode
On threshold
Off threshold
Press
B15 2
G_T=01:00s
Time interval for pulses
(example)