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7
Unexpected Events
Three-Phase Power Failure (Compressor)
Cooling-Water Failure (Water-Cooled Compressor)
100
See
"Error Messages"
1
Error code 122: GM Compressor Trip (Warning)
a
NMR stopped
b
Turbo pump started
c
Waits for Error Code 105 or power to return
2
Three phase power returns before other errors occur
a
Compressor will restart
Probe re- cools to set point
b
Turbo pump stops
c
Error code 105: Temperature Fault
3
Probe temperature exceeds 60K. The time for this to
a
occur is system dependent, but typically around five
minutes.
System state changes to Warming
b
The user should:
c
•
Halt NMR.
•
Eject the sample.
•
Verify that all capacitors are two or more turns away
from either extreme of their range.
See
"Error Messages"
Error Code 121: GM Compressor Alarm (Warning)
1
Waits for other faults to manage (such as, error code 105:
2
Temperature Fault).
3
It takes some time for the compressor to cool enough to
resume operation and usually requires a warm up of the
system.
4
The customer should initiate a standard Stop operation
before additional faults are incurred.
on page 83.
on page 83.
Cryogenic Systems Operation
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