TROUBLE SHOOTING
22 June 2007 / Alpha alternator - Alpha Pro regulator / EN
PROBLEM POSSIBLE CAUSE SOLUTION
• 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 regulator
Replace Alpha Pro regulator
Alpha Pro 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
• 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 (see section
5.2)
• Battery temperature sensor not
connected or not attached to the
batteries
Check the battery temperature sensor
Output voltage too high
• 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
5.2.4)
Alpha Pro 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.
To Next Page
Loading...
Need help?
General
