Analogue Inputs; Protection Functions - MarelliMotori D-Vo Light Manual Del Usuario

5.4.

ANALOGUE INPUTS

D-Vo allows to control the setpoint of the active operating mode through analogue signals supplied to the following
inputs:
•
2 current inputs, 4 ~ 20mA;
•
1 voltage input ±10V;
•
External potentiometer 100kΩ.
The circuit housing the analogue inputs is classified in isolation class II, with reinforced isolation,
equivalent to double isolation.
The reference voltage is SELV - Safety Extra-Low Voltage.
The external device must have galvanically isolated outputs, or outputs that are referred to PE meeting
the common mode voltage values specified in the specified in the Technical Data (Chapter 3).
Each analogue input, connected as described in Chapter 4.4 and activated through the tab Programmable inputs /
Analogue inputs of D-Vo Dashboard (Paragraph 7.3.4), allows to determine the value of the setpoint in the active
operating mode, calculated linearly within the limits set in the Setpoint tab of D-Vo Dashboard (Paragraph 7.3.4),
which is associated with the operating limits of the inputs.
If the Droop compensation function is active (PAR digital contact closed), the setpoint cannot be changed, unless
the function Enable voltage setpoint adjustment is enabled in the Droop compensation tab (Paragraph 7.3.4).
5.5.

PROTECTION FUNCTIONS

D-Vo provides a set of protection functions, which sense any abnormal or dangerous operating states and provide
an outbound warning, as a visual indication displayed by D-Vo Dashboard and/or as a signal associated to a digital
output (relay).
PROTECTION
Exciter field overvoltage
9638571A0_C
DESCRIPTION
When the measured exciter field voltage, V
threshold, V , for a settable time delay, T
EXC_OV
switches to active state.
V
EXC_OV
The switching of the protection to active state is signalled by a visual warning in
D-Vo Dashboard, and can be optionally associated with one of the three
programmable output relays (which assumes the same state as the protection).
D-Vo Light – Marelli Motori
, increases beyond a settable value
EXC
, the field overvoltage protection
D
Exciter field overvoltage
T
D
VEXC
time
EN 27