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P a g e
1 x Relay Drive
The coil voltage rating must match the rating of the vehicle (12 or 24 V DC)
and the coil current must not exceed 200mA.
Relay operation is controlled by the FM 3617i/FM 3717i/FM 3817i and is
specified in “Vehicle Properties” of front end user software.
9.4 Look up table for installers to determine Speed and RPM FM Dealer
Sensitivity Settings
Values measured at 25ᵒC
Use FM Dealer Utility to set the RPM/Speed Sensitivity:
The default value is set to allow the smallest signal (most sensitive). To make it less sensitive, one can use
the FM Dealer Calibration to filter out unwanted noise by changing the calibration to a less sensitive setting.
The table below can be used to determine a Calibration/Sensitivity value that will minimise false triggering on
the inputs. The left hand column represents the signal type and level of the input signal. Choose the lowest
sensitivity value (in FM Dealer) that will satisfy the frequency of the input at that specific input level.
For this to work correctly, the duty cycle for frequencies above 200 Hz must be 40-60%. To measure the
signal type/level accurately, an Oscilloscope is needed.
Signal Type/Level
RPM/Speed Calibration/Sensitivity (FM Dealer)
Less
2
3
4
More
N/R = NO RESPONSE
Square
1V
N/R
N/R
N/R
N/R
2.7kHz
2.5V
N/R
N/R
N/R
3.6kHz
11kHz
5V
N/R
N/R
3.5kHz
10kHz
20.9kHz
10V
<1Hz/5kHz
6.5kHz
11.1kHz
17.3kHz
34.9kHz
12V
<1Hz/6.5kHz
9.9kHz
13.4kHz
21.3kHz
>35kHz
15V
<1Hz/8.5kHz
11.1kHz
16.8kHz
25.7kHz
20V
<1Hz/11.4kHz
16.4kHz
21.1kHz
31kHz
24V
<1Hz/13.8kHz
18.2kHz
25kHz
>35kHz
Triangular
1V
N/R
N/R
N/R
N/R
N/R