Bruker RS - Page 95

95
ZTKS0156 / Z31820 / Rev.: 03
Troubleshooting
Continued from page before
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Indicator Possible reason Solution By
Shorting plug cannot
be removed.
The connector is
covered with ice
(frozen moisture or
nitrogen ice).
Carefully remove the ice with
warm helium gas. To remove
small ice spots use the dip-
stick or the precooling tube as
tubing for the warm helium
gas.
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The magnet system
quenches
Loss of
superconductivity.
See chapter ”After a
Quench” on page 6-107.
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The helium level was
too low for energi-
zing, cycling,
shimming,
de-energizing.
See chapter ”After a
Quench” on page 6-107.
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The power supply is
defective. The main
current is oscillating.
Replace the power supply. Bruker Service
The main coil switch
can not be closed on
field.
The helium level is
too low for energi-
zing. The main coil
switch is not covered
with liquid helium.
Never try to energize the
magnet with less than the
"minimum level during energi-
zing" in the helium vessel.
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The power supply is
defective. The main
current is oscillating.
Replace the power supply. Bruker Service
Shim current can not
be set correctly.
The control cable is
not connected cor-
rectly to the current
lead or to the power
supply.
Connect the control cable cor-
rectly to current lead and
power supply.
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Switch „Main Coil/
OFF/Shim Coil“ in
wrong position.
Change the switch position Bruker Service
Shims do not affect
the NMR signal.
Shim heater current
is not correct. The
shim switches are
not opened.
Set the shim heater current to
the specified value (see
Appendix Technical Data)
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