3.10.2 Generator frequency
If the pickup is not used, set the setpoint Gear Teeth to zero. The engine speed will be measured from
the generator frequency. Connect the W terminal from the charging alternator instead of the pickup, if
possible. See picture below.
+
D+
COM
RPM
-
W
D+ (L)
+
-
Charging alternator
RPM is measured from generator frequency.
D+ and W terminals from the charging alternator can be used as additional signals
for detection of running engine.
T2A
3.10.3 Additional running engine indication
It is helpful to have information other than speed (RPM), whether the engine is rotating or not,
especially if RPM is measured from the generator frequency instead of magnetic pickup. The
generator frequency measurement can be unreliable at very low speeds and/or may have a delayed
reaction to sudden and big changes (i.e. in the moment that the engine has just started…).
The following conditions are evaluated as additional running engine indication:
Voltage on the D+ input is higher than 80% of battery voltage. Connect this input to the D+ (L)
terminal of the charging alternator and enable the D+ function by the setpoint D+ Function. If
D+ terminal is not available, leave the input unconnected and disable the function.
The pickup is not used and frequency is detected on the pickup input. Connect the pickup
input to the W terminal of the charging alternator if you do not use pickup and the W terminal
is available. If not, leave the input unconnected.
NOTE:
The starter cut-off frequency has to be adjusted by the setpoint Start W Freq. If you know the charging
alternator nominal frequency, adjust the setpoint to the frequency obtained from following equation:
If you do not know the charging alternator nominal frequency, follow this procedure:
1) Make sure that the starting accumulator is fully charged.
2) Close a fuel valve manually to disable the engine from being started.
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