TROUBLE SHOOTING
26
January 2013/ Alpha alternator - Alpha Pro II regulator / EN
ISSUE
POSSIBLE CAUSE
SOLUTION
Regulator stays in bulk mode
all the time (Bulk LED stays
on).
•
Alternator is overloaded.
Switch off a load; (part off) consumers.
•
Defective batteries, short-circuit
between cells.
Check batteries and replace if necessary.
•
Defective alternator
Check alternator and replace if necessary.
•
Capacity of the charging system is
too low.
Use an alternator with more capacity or
increase charging capacity by using an
additional charger. Consult your
Mastervolt representative for advice.
•
Defective Alpha Pro II regulator.
Replace Alpha Pro II regulator.
Alpha Pro II regulator does
not return to bulk mode
when a high load is switched
on
•
Once the regulator is in absorption
mode a timer is started and after
this time the regulator switches to
float and will stay in this mode.
Nothing; this is a normal situation. If
necessary: switch off engine and start
again. See also section 5.3.
Alternator is getting hot while
engine is not running
•
Rotor field windings are still excited
while engine is not running.
Switch off DC immediately to avoid field
windings of the alternator being damaged
due to overheating. Check the oil
pressure contact or ignition relay for
correct operation. This switch (S1) must
be open when the engine is not running.
Check wiring between battery and [reg on]
terminal.
Output voltage too high
•
The regulator measures a too low
battery voltage and tries to
compensate it.
Check wiring between battery and [reg on]
terminal for corrosion. Check for voltage
drop across the oil pressure switch (S1) (if
applied). The line between battery and
[reg on] should not be used by other
loads.
•
Wrong setting of the charge
voltage.
Adjust the charge voltage.
•
Battery temperature sensor not
connected or not attached to the
batteries.
Check the battery temperature sensor.
•
With non-Mastervolt alternators:
terminal [D–] is not isolated from
ground.
Check voltage on terminal [D–] It should
measure nominal battery voltage. If this
voltage is 0V, check whether the terminal
[D–] is isolated from ground.
Charge voltage stays in
absorption mode too long /
too short
•
Wrong setting of the absorption
timer.
Adjust the absorption timer (see section
5.2.6).
Alpha Pro II regulator is in
float mode, but battery
voltage is still at absorption
or bulk level
•
Any other device is charging the
batteries.
Switch off all other charging devices and
check battery voltage again.
No display function
•
Display has switched off
Switch on display.
•
Error in the network wiring
Check wiring for errors.
MasterView display shows
no Alpha Pro II
•
No terminating device placed at the
ends of the network
MasterBus needs a terminating device on
both ends of the network. Check if
available (See section 4.2).
