Bruker BMPC/2, Technical Manual

Page: 18 / 136

18 Z31823_00_05
Principles of Operation
4.3.1 The Default Pump
The default pump that is used when the unit is switched to automatic mode depends on
which, if any, pump is operating:
•
If one pump is running, this will become the default pump.
• If both pumps are running, they will both be regarded as default pumps.
• If no pump is running then, Pump 1 will be used as default.
4.3.1.1 Default Pump Failure
The BMPC/2 continuously monitors the condition of the default pump(s) in operation. If
one of the pumps or valves malfunctions:
1. The malfunctioning pump (or valve) and its corresponding valve (or pump) are
stopped or closed.
2. Either the other pump switches on automatically and the corresponding valve is
opened, or, when both pumps were operating, the other pump will continue to oper-
ate and its corresponding valve will remain open.
3. The BMPC/2 software will display an error message indicating the current problem.
4.4 Monitoring in Automatic Pump Mode
The BMPC/2 continuously supervises the following magnet parameters and compares
these with their preset limit values (see "Limit Values" on page 100 ):
• P1 Pressure
• T1/T2 Temperature
• F1 Helium Flow
When one of these limit values is exceeded, the BMPC/2 activates the second pump,
which will always operate for at least 1 hour. Afterwards the pump may continue to run
for an additional hour or will be switched off depending on the actual system status.