Terumo 801763, Operator'S Manual, Page: 208 / 359

Centrifugal Control Unit
6-9
pump speed is reduced to 1500 RPM. Pressing the Stop button will stop and
deactivate the pump. Decreasing the speed to zero using the control slide bar will
stop the pump. If the pump is stopped and deactivated using the
Start/Stop button,
it must be reactivated using the Start/Stop button for the pump to be used again.
Minimum Flow Alarm
Minimum flow alarm is an alarm generated by a centrifugal pump when the flow rate
decreases below the user defined limit.
The Min flow alarm is only active at speeds above 1550 RPM.
1. Set the Min Flow alarm. See Central Control Monitor chapter, Setup tab ,
Pumps subtab .
2. Monitor centrifugal pump speed and flow.
Note: Increasing the speed of a centrifugal pump beyond 1550 RPM when the flow
is below alarm setpoint after the minflow threshold has been crossed once, can
cause an alarm. Devices with established safety connections will respond.
When Pulse mode pumping with a centrifugal control unit, because of variations in
flow, the minimum flow alarm is disabled.
Coast
™
Response
Coast Response
If the centrifugal pump speed is 1560 RPM or above, a Coast response causes
the pump speed to reduce to 1500 RPM. The Coast speed of 1500 RPM may be
high enough to allow some forward flow or, in rare instances, may not be sufficient
to prevent backflow based on the resistance and back pressure in the perfusion
circuit. In addition, a Coast response triggers a brief lockout of speed adjustments to
guarantee that the safety response occurs. The result is that the speed of the pump
is fixed after a Coast response for a period of 2 seconds. After this brief lockout, the
centrifugal pump speed can be adjusted even though the condition that initiated the
Coast response still exists.
If the centrifugal pump speed is less than 1560 RPM, a Coast response does not
cause the pump speed to change, however the lockout still occurs.
Adjust the RPMs by using the pump speed control knob on the centrifugal control
unit or the control slide bar on the CCM to achieve a static or no-flow state. Monitor
the speed closely whenever a Coast response has been executed. Return the pump
to its previous setting when appropriate.
WARNING:
Always place a flow sensor on a centrifugal pump speed/flow
display area to enable the minimum flow alarm and any safety connections that
have been set for a minimum flow alarm.