Terumo Advanced Perfusion System 1 Operator's Manual page 209

Centrifugal Control Unit
CAUTION: A pump may drop to a speed below 1500 RPM if the pump was
previously in pulsatile mode with an average speed lower than 1500 RPM when a
Coast response occurs.
Coast Lockout
When a safety event with a configured Coast response occurs, a centrifugal pump
will lock out manual adjustments to the pump speed for 2 seconds. This brief lockout
response guarantees that the safety response occurs.
The Coast lockout is signified in two ways during the brief lockout period:
• The centrifugal pump slide bar on the CCM grays out and is disabled.
• The Bar Graph on the Centrifugal Control Unit blinks.
User control is returned after the lockout period.
Coast Event
A Coast event is an event generated by a centrifugal control unit that can initiate
a response in other pumps and the occluder. The Coast event message is sent
when the centrifugal control unit goes to Coast speed (1500 RPM) as a response to
another event or when the user decreases the speed of the centrifugal control unit to
1550 RPMs. Devices configured to respond to a Coast event will do so regardless of
how the event was generated. For examples, see the illustration below.
User adjusts
pump speed
< 1550 RPM
Safety event
i.e. low
level alarm
Occluder responds
Pump goes
to Coast
goes to Close
Pump
Occluder responds
Response:
Coast
goes to Close
6-10
to Coast,
to Coast,