20
Troubleshooting
Symptom
Possible Fault
Action
I’ve adjusted the HF comp
and see no change.
1) T
he driver is working close
to maximum output so there is
not enough headroom for the
HF comp to make a difference.
1) Check loop characteristics.
If response OK at 1 amp, the
headroom is inadequate.
I start the driver and
immediately the status light
turns on.
I start the driver and the
test sequence starts, but the
status light turns on after it’s
completed.
I’ve connected the loop and
the driver doesn’t work, the
status light comes on.
My driver has been working
well for a couple weeks and
now the status light is on.
1)
Loop shorted or open, too
small or too large.
2)
Internal self-test failure.
1)
Check loop and
connections, try known good
loop.
2)
Check loop DC resistance
with an ohm meter:
0.33 ohms minimum.
The power light doesn’t
come on.
1) Mains power absent.
2) Internal failure.
1) Check mains power.
2) Seek assistance.
I can’t get my driver out of
adjustment mode.
1) Button presses not
coinciding.
2) Internal failure.
1) Press both buttons together
to exit mode.
2) As a last resort, cycle
power off/on. New settings
should have been saved.
Interference (buzzing/
whistling/hissing) is heard
through induction loop.
1) Bad input signals.
2) Internal failure.
1) Power off driver and
confirm that interference isn’t
from external origin.
2) Disconnect input signals.
If sound disappears, check
inputs.
My driver is very hot.
1) Large amount of mains hum
present on input.
2) Internal failure.
1) Check input signal source.
2) Incorrect driver being used.
