Maintenance - MarelliMotori MARK X User Manual

14.2. Electrical test of the power components
1. Set preliminarily the potentiometer VOLT completely counter clockwise.
Connect a power resistor 100Ω - 200W to terminals + and -.
2.
3. Power up the card with voltage 220Vac (@ 50 or 60Hz), applied to terminals U and N.
4. Measure the load current: it must be = 0A.
5. Turn VOLT completely clockwise.
Measure the load current: it must be ≈ 1A.
6.
NOTE: the resistive load can be alternatively replaced with a bulb. In this case, instead of a measure of the current, it is
sufficient to verify the bulb light is OFF in phase 4. and ON in phase 6.
WARNING: this test allows to detect failures of the power diodes and/or the AVR power supply circuit.
Accuracy, stability and other regulation features can be verified only on the final generator application.

15. MAINTENANCE

The only preventative maintenance required for the regulator is to check the connections between the regulator itself and the
system: make sure they are clean and tight and that the cabling shows no imperfections or damage.
The M40FA644A is a circuit board protected by a polyurethane resin that protects the device from dampness, dust and
aggressive environments: in case of malfunction or damage of any type, any modifications, repairs or adaptations not previously
approved by Marelli Motori are forbidden.
16. ASSISTANCE
For any questions regarding the connection diagrams, information or any board malfunction, damage or problem, contact Marelli
Motori Customer Assistance, Marelli Service.
Marelli Motori
Via Sabbionara 1
36071 Arzignano (VI)
Italy
T +39 0444 479 711
F +39 0444 479 888
info@MarelliMotori.com
sales@MarelliMotori.com
service@MarelliMotori.com
U
N
+
-
LOAD
220Vac
17