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8. TROUBLESHOOTING
8.1. EARTH FAULT
The earth voltage can be measured in two ways; either between earth and the rectifier or between earth and the batteries. If mains
is connected the measurement should be done against the rectifier otherwise it should be done against the batteries.
The following tables show the nominal earth voltage:
Nominal earth voltage
0V-to-Earth
+12.9V DC
B- -to-Earth
+14.2V DC
The AC voltage is dependent on the rectifier. Best way is to turn off mains and let the control unit run on batteries. Then the AC
voltage should be less than 0.5V.
(Control unit powered by mains)
(Control unit powered by batteries)
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