24
Subject to change without notice
ELECTRONIC FUSE
This pushbutton will activate the electronic fuse mode, indicated
by LED [ON].
Current limiting
After turn-on of the power supply it will always start in the
“Current limit“ mode.
Using the CURRENT LIMIT
controls the maximum output
current I
max
can be set for each output separately. Onset of
current limiting in one channel will not influence the others.
In order to adjust I
max
the appropriate output has to be short-
circuited first, then I
max
can be set, the associated LED
or
will light up and indicate the current limit mode.
Electronic fuse (Fuse)
Prior to selection of this mode the current limits have to be set
using the CURRENT LIMIT
controls. As outlined each
output has to be short-circuited first before adjusting the
appropriate CURRENT LIMIT control. After setting I
max
the short
has to be removed. Then Electronic Fuse
is depressed, the LED
[ON] will light up indicating that the HM 7042-4 is in the Electronic
Fuse mode. In this mode all outputs will be immediately deactivated
if the I
max
of one channel is reached. In order to leave this mode
press Electronic Fuse
again.
The current limits can be set using the controls
CURRENT LIMIT
0 – 2 A / 0 – 5 A. If a control
is set CCW to 0 A indeed the current will be zero, so the output
capacitances will be discharged slowly to 0 V. In Current
Limit mode the CCW position of a control will cause the
associated LED
to light up, the output voltage will
decrease slowly. In the Electronic Fuse mode the CCW
position of any CURRENT LIMIT control will result in imme-
diate switching off of all channels after depressing OUPUT
ALL CHANNELS
.
OUTPUT ALL CHANNELS
Pushbutton for turning all 3 channels simultaneously ON/OFF,
indicated by the LED [ON]. The voltage displays will remain
unaffected.
Mains switch
STOP
Survey of all operating controls and displays
