Bruker CryoProbe User Manual

80 (107) BRUKER CryoProbe User Manual
Troubleshooting
velop anywhere in the system. In the absence of active cooling, all cold parts will
passively warm up to ambient temperature, typically overnight.
NOTE: After a passive warm-up, a
COOL DOWN request will be accepted by the
CryoController only if the entire system had reached room temperature before.
When the mains power comes back, the CryoController analyses the actual state
of the system and decides if the system will be warmed-up and set into stand-by
mode or if the cryo-operation conditions are to be re-established. The latter deci-
sion will be appreciated especially if a power failure occurs outside the working
hours. When the user returns to the NMR lab, the CryoProbe System will be al-
ready on its way to re-establish measuring conditions. The NMR acquisition, how-
ever, is controlled by the CCU in the spectrometer cabinet and will not be re-
initiated automatically for safety reasons.
The system will cool down again if conditions permit. However, this will work only
when the temperature has not exceeded a certain value. If the system had be-
come too warm, it will not automatically cool down again but has to be warmed-
up. Press
WARM UP to complete the warm-up cycle in a controlled way, wait until
ambient temperature is established, then
COOL DOWN again.
Mains interrupt on individual units
NOTE: As a troubleshooting tool,
UNPLUG can be pressed at any time. This per-
mits to disconnect any control cable in the CryoProbe System for about 1 min
without causing an E
RROR.
These are the consequences of a power cut on individual CryoProbe System
components during operation:
CryoProbe: An interrupt of the cable between the CryoCooling Unit and the Cryo-
Probe connector J2 would usually cause no damage. The CryoController will send
an error and initialize an emergency warm-up. The emergency warm-up can then
be terminated and cold operation continued by pressing
COOL DOWN.
An interrupt of the electronics supply cable between the HPPR CRP and the Cryo-
Probe connector J1 will temporarily disable the cold electronics, leading to an al-
most vanishing NMR signal. Besides this, however, it will have no impact on the
overall cryogenic operation.
CryoCooling Unit: A mains power cut is equivalent to an "Emergency Off" on
page 71 and would normally not cause any damage. Upon return of power, the
CryoCooling Unit reboots and - depending on its condition - it may even decide to
continue with its last task.
VT unit: A B-VT3x00 unit will stop the VT gas flow and the heater upon a mains
interrupt. The heater is not switched on automatically when the power returns.
Thus, the sample is in danger of freezing (see "VT gas interrupt" on page 81
). A
UPS is recommended for them.
A
VANCE spectrometer: A power cut would usually cause no damage - except for
the workstation harddisk which could crash. The mains supply of an A
VANCE cabi-
net is automatically disabled. Before switching on the spectrometer manually after
return of power, set the major loads O
FF (e.g. the amplifiers) to avoid blowing fus-
es with an initial current spike. The CryoPlatform, however, is normally not dis-
turbed by a spectrometer shutdown.
Water chiller (optional): A water chiller will usually not be damaged by a power
cut, and it will resume its task upon return of electricity. However, when the cool-
ing water supply is stopped, the He Compressor halts and a passive emergency
warm-up will be initiated by the CryoController.

Bruker CryoProbe Specifications

General

Brand	Bruker
Model	CryoProbe
Category	Laboratory Equipment
Language	English