MarelliMotori D-Vo Light Manuel D'utilisation page 62

1. fully disconnect D-Vo from the remainder of the system;
2. power D-Vo for an external source, in accordance with the specifications, then check the colour of
the FCR LED, in the Monitor area.
If:
•
the LED is on: the FCR mode is enabled even when the FCR contact (C8) is open; move to Step 5.
•
LED off: the FCR mode is properly disabled when the FCR contact (C8) is open; therefore you need
to check the proper operation of the control system of the FCR digital input (C8) (a component not
supplied by Marelli).
Step 5 Use D-Vo Dashboard to verify whether the voltage setpoint has been modified by one of the analogue
inputs, if in use.
Check that the values at the analogue inputs are read properly and that they are consistent with the
application requirements.
If the voltage setpoint has been modified by an analogue input, check the analogue input control system
(a component not supplied by Marelli Motori).
Otherwise, move to Step 6.
Step 6 Check whether the voltage setpoint has been modified by the LOWER digital input (C4 by default) or if
the digital input in question is improperly controlled.
In particular, check whether the LOWER contact is working properly by following the procedure
described below:
1. with the generator stopped, disconnect the cable connected to C4;
2. bring the generator to the rated speed and measure the output voltage (with voltage setpoint equal
to the rated voltage of the generator).
If the measured voltage matches the rated one, check for the proper operation of the LOWER digital
input control system (a component not supplied by Marelli).
If the voltage is still lower than the rated one, move to Step 7.
Step 7 Replace the regulator.
With the generator running at the rated speed, no load, the voltage at the output terminals is higher than the rated
value.
Step 1 If the voltage at the output terminals exceeds 130% of the generator rated voltage, IMMEDIATELY
STOP THE GENERATOR and check ALL the connections, and in particular those on the S1, S2, S3
measurement terminals.
In case of improper or missing connections, perform them again in accordance with the diagrams
supplied along with the generator.
If the problem persists after the generator is restarted, skip to Step 6.
If the voltage at the output terminals of the machine is equal to or lower than 130% of the rated voltage,
move to Step 2.
Step 2 Check the D-Vo settings. In particular, use D-Vo Dashboard to check that:
1. the rated voltage setting is consistent with the nameplate data of the generator;
2. the sensing settings are consistent with the nameplate data of the generator and with the D-Vo
specifications;
3. the voltage setpoint is the required operating setting.
Edit any incorrect settings.
Otherwise, move to Step 3
Step 3 Check whether the FCR mode is enabled.
If it is disabled, move to Step 4.
Otherwise check whether the FCR digital contact (C8 by default) is improperly controlled or broken, by
following the procedure described below:
1. fully disconnect D-Vo from the remainder of the system;
2. power D-Vo for an external source, in accordance with the specifications, then check the colour of
the FCR LED, in the Monitor area.
If:
•
the LED is green: the FCR mode is enabled even when the FCR contact (C8) is open; move to Step
4.
•
LED off: the FCR mode is properly disabled when the FCR contact (C8) is open; therefore you need
to check the proper operation of the control system of the FCR digital input (C8) (a component not
supplied by Marelli).
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D-Vo Light – Marelli Motori
EN 62