Symptom
Possible Cause
Explanation/Corrective Action
Load is set to draw a
current. The current is
correct but the “SYS”
and “SAT” LEDs light
yellow.
DC voltage applied to the load
is too low.
Raise the input voltage.
If the voltage is above the
compliance voltage
specification, one or more
components in the power
section may be defective.
Send the unit in for service.
Load draws current
when it is not
programmed for
current.
Loads rear terminal strip has a
programming (0 to 10 VDC)
signal applied to “REM”
(positive) and S– (return) and
the “EXT PROG” button has
been pressed.
The load is in the external
programming mode. Press the
“EXT PROG” button to clear the
unit to the constant current mode.
Peak button has been set for a
current other than zero and the
pulse “RUN” button has been
pushed.
The load is in the pulse mode.
Press the “RUN” button to clear
the unit to the constant current
mode.
In the constant power mode, the
voltage sense leads may be
improperly wired.
If the voltage sense leads read zero
applied voltage, the load will try to
draw to draw infinite current to
achieve the proper power.
Units are shipped with internal
voltage sense lead jumpers
installed on the rear terminal strip.
These can be removed and remote
sense leads can be installed. Refer
to the voltage sense-related
sections of Chapter 1.
Loads power section may have
one or more defective
components.
Send the unit in for service.
Loads voltmeter
reading does not
match the voltage
sense leads measured
on the rear terminal
strip.
The voltage sense leads may be
improperly wired.
Units are shipped with internal
voltage sense lead jumpers
installed on the rear terminal strip.
These can be removed and remote
sense leads can be installed. Refer
to the voltage sense-related
sections of Chapter 1.
XBL Series 404078 Rev P2.odt Page 39 Of 162