FAST-Bi-1K5 – User’s Manual
40
disabling the PS output. The temperature has to go below threshold before being able
to reset the fault status resister and to enable the PS output again.
DC-Link Fault
The FAST-Bi-1K5 is composed internally by a bidirectional power AC-DC
section, cascaded with a DC-DC stage. The DC voltage generated by the AC-DC
section is also called DC-Link and it is proportional to the maximum rated voltage of
the specific model. Usually, the DC-Link voltage is about 20% higher than the rated
output of the FAST-Bi-1K5. A continuous monitoring of the DC-Link voltage is
performed in order to always guarantee the capability of obtaining the maximum
voltage from the PS. If the DC-Link voltage either drops below or becomes larger than
a set threshold, the regulation capabilities of the PS could be compromised and a fault
condition is generated. The over/under voltage fault is triggered by a hardware circuit
and, as mentioned, the thresholds are set taking into account the ratings of the specific
model. It is necessary to reset the status register and to get rid of the fault cause before
turning the PS back on again.
Input OVerCurrent – OVC
The internal current drawn from the AC/DC module to every single power stage
is sensed by a hall transducer. This current is compared with a threshold set in hardware.
The threshold value of intervention depends on the FAST-Bi-1K5 specific model and
cannot be changed by the user. The tripping of this fault generates a latched fault
condition. A reset of the PS fault status register needs to be performed in order to be
able to enable the PS output again.
Earth Leakage
This protection continuously monitors the current flowing to earth and it has a
settable threshold in [A] that can be set by experienced users. The tripping of this
protection generates a fault condition that disables PS output.
Earth Fuse
An earth fuse is present on the rear side of the PS rated at 5A Class F. The
blowing of this fuse generates a fault condition and the fuse needs to be replaced in
order to get rid of the fault condition before resetting the PS fault status register. The
fuse housing is shown in
