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LiAM Description
Figure 20: AC OK front-panel light indicator
Please note that the loss of the phase dedicated to supply the control and
auxiliary circuit will turn off module communication, making the LiAM connectivity
inaccessible.
3.1.1.1 Over-Temperature
The output stage of the LiAM power supply is monitored by high-gain and
high-precision temperature sensors in different places.
The module internal logic disables the output when the maximum temperature
among these rises above a user-defined threshold value and sets an "Over-
temperature" flag in the status register, thus generating a FAULT condition that, as in
the other cases, needs to be reset before enabling the output again.
The over-temperature fault trips whenever the following condition is true:
where T
and T
are the internal measured temperature values and T
1
2
factory threshold chosen for correct and safe operation.
3.1.1.1 Output Over-Voltage
The output voltage of the LiAM power unit is protected from over-voltages by
an internal routine that continuously monitors the voltage readback values and turns
the power supply off (by ramping its current to 0A with a pre-defined slew-rate of
5A/s) whenever the following condition applies:
i.e. the output voltage value is over the defined threshold (rated output voltage + 5V)
for four consecutive sampling periods.
3.1.1.1 Regulation Fault
The module internal logic continuously monitors the actual output current
readback with the last stored setpoint. If this absolute difference is larger than a pre-
defined threshold, the power supply generates a fault condition that turns the output
off since the internal regulation could reach the correct setpoint value.
(
)
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LiAM User's Manual
the pre-defined
TH
30
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