INSTALLATION
EN / Alpha alternator - Alpha Pro II regulator / January 2013
13
4.5.4
Connection of a tachometer (optional)
If a tachometer is used, it should be connected
between the W terminal of the alternator (see
reference
) and the B– terminal of the alternator
(or the NEG pole of the battery). See figure 9.
NOTE!
With some alternators the W terminal is
marked by an “R” instead of a “W”
NOTE!
The operation of the tachometer can not
be guaranteed when the Alpha Pro II
regulator switches from absorption mode
to float mode. Switching on some loads
during operation will solve this problem.
Figure 9: Connection of a tachometer (position of the
terminals may differ; see APPENDIX figures A-6 till
A-9)
The Alpha Pro II regulator has the same function
integrated in its MasterBus functionality, so the
number of revs can be shown on a MasterBus
connected display too.
4.5.5
Connection of an alternator indication
lamp (optional)
To check the correct operation of the alternator often
an indication lamp is used. This lamp will go off
when the alternator is charging.
The Alpha Pro II regulator has this function
integrated in MasterBus so at an alternator failure a
MasterBus alarm is shown, refer to section 6.3.2.
Tachometer
“W”
“B–”
