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7.7 Stop after power failure
The "Stop after power failure" function is used to
prevent the pump from performing a reference
movement and start dosing when the power supply is
switched on or reestablished after a power failure.
A reference movement is performed every time the
power supply is switched on. With the reference
movement the pump identifies the exact diaphragm
position to ensure accurate dosing. Depending on
the initial diaphragm position, the reference
movement can dose a small amount of dosing
medium into the process. To avoid this, you can
enable the "Stop after power failure" function.
The function is disabled by default.
When this function is enabled:
• The pump stops and displays an alarm when the
power supply is switched on. The pump will
perform the reference movement after the alarm
was acknowledged by the user.
• Functions which require the reference movement
are deactivated until the reference movement
was performed. These functions are:
– Auto deaeration
– FlowControl
– Moving the diaphragm into service position
– Volume counter
To avoid dosing during the reference movement,
perform the following steps after the power supply
was switched on:
1. The pump is in operating state "Standby" and
displays an alarm. Push the [Start/stop] key to set
the pump to operating state "Stop".
2. Make sure a deaeration hose, which is routed
into a container, e.g. a drip tray, is connected to
the deaeration valve.
3. Open the deaeration valve by approximately half
a turn.
4. Acknowledge the alarm on the display.
– The pump performs the reference movement.
The dosing medium flows through the
deaeration hose and not into the process.
5. Close the deaeration valve.
6. Push the [Start/stop] key to start the pump.
This function is only available in pumps
with software version V2.00 or higher.
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