B722-40-880 Issue H
Page 48
© Edwards Limited 2018. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Operation
Table 21 - Behaviour of a pump when the power is re-instated after an electrical supply failure
Length of power failure
Control mode
Behaviour of pump
Power is reinstated before pump
rotational speed falls below 50%
Either Parallel or Serial Control
Regenerative power maintains all
output signals during the power
failure. The pump will ramp to its
designated speed as quickly as
possible after the power has been
restored.
Power is reinstated after pump
rotational speed falls below 50% but
before regenerative power ceases
Either Parallel or Serial Control,
Timer disabled
Regenerative power maintains all
output signals during the power
failure. As the Timer is disabled, the
Podule will go into fail condition as
soon as speed falls below 50% and
will display flashing error code 0.
When the power is reinstated, the
pump will not ramp up until the
error is cleared. To clear the error,
send a Stop command (either
parallel or serial, depending on the
control mode). Then send a Start
command to ramp the pump up to
designated speed.
Either Parallel or Serial Control,
Timer enabled
Regenerative power maintains all
output signals during the power
failure. If power is reinstated before
the Timer period expires, the pump
will ramp up to its designated speed
as quickly as possible. If the Timer
period expires, the Podule will go
into Fail condition and will display
flashing error code 3. As above,
when the power is reinstated, the
pump will not ramp up until the
error is cleared. To clear the error,
send a Stop command (either
parallel or serial, depending on the
control mode). Then send a Start
command to ramp the pump up to
designated speed.
Power is reinstated after pump
rotational speed falls below 50% and
the regenerative power ceases
Either Parallel or Serial Control
Regenerative power ceases and fails
to maintain output signals. When
power is reinstated, the pump with
parallel control will automatically
restart if the Start control on the
logic interface is set to Start. The
pump with serial control will require
a Start command to ramp the pump
up to the designated speed. Any Fail
signals that were triggered during
the regenerative power period are
lost when the power is reinstated.
