33 F600 Step By Step Guide
No Flow
The no flow by software detection scheme is intended to detect when there is no liquid flow due to a
closed pump discharge valve e.g. a closed tap. This is intended to be used in a pump system where
the main process PID feedback is a pressure transducer and not a flow transducer.
Over-cycle protection
Over-cycle protection handles when the drive wakes and sleeps too many times in an hour.
Diagnostics –
The last 3 trips are stored in Pr 00.077 to Pr 00.080, with Pr 00.077 being the most recent trip.
Refer to the F600 User guide for a complete list of trips and their meaning.
Pr 0.051
Dry Well Low Load Delay. The percentage load value in Pr 0.070 must be less than the
Dry Well Low Load Threshold Pr 0.050 for the Dry Well Low Load Delay in seconds. This
filters transient load values.
Pr 0.052
Dry Well Low Load Mode. Disabled (0), Dry Well Low Load detection is not operational.
Alarm Only (1), Dry Well Low Load Alarm in Pr 29.062 = On(1) when a dry well is
detected. Trip (2), The drive trips on Dry Well when a dry well low load condition is
detected. Lower PID Output (3) the PID Output limit is reduced to the value set in Dry Well
Low Load PID Reduction Pr 0.053.
Pr 0.053
Dry Well Low Load PID Reduction. This is the PID output limit percentage used when a
dry well low load condition is detected and Dry Well Low Load Mode Pr 0.052 = Lower PID
Output (3).
Pr 0.054
Dry Well Low Load Restart Delay. When Dry Well Low Load Mode Pr 0.052 = Trip (2) and
a dry well trip has been actioned, the drive will remain in the Dry Well Stop state for the
duration of the Dry Well Low Load Restart Delay, allowing time for the well to fill.
Parameter Description
Pr 0.055
No Flow Detect Threshold. This is a frequency or speed threshold below which No flow is
detected. This must be set higher than the Positive Minimum Reference Clamp Pr 0.023
or the Sleep Detect Speed Threshold Pr 0.042. When a pump discharge valve is closed,
the PID output will reduce to maintain pressure. No Flow Detect Threshold must be
greater than 0 to enable the feature.
Pr 0.056
No Flow Detection Band. This is a band above and below the No Flow Detect Threshold
Pr 0.045.
Pr 0.057
No Flow Detect Delay. When the process PID output is in the No flow detection band it
must remain there for No Flow Detect Delay to filter intermittent no flow frequency or
speed detection.
Pr 0.058
No Flow Setpoint Settling Delay. After the PID output is in the No flow detection band for
No Flow Detect Delay seconds, the main process PID setpoint is lowered by a small value
defined by No Flow Setpoint Reduction Pr 0.059. If after the reduction is applied the PID
output is still in the No Flow Detection Band, the system will be stopped due to no flow
where the drive will enter the “Sleeping” state.
Pr 0.059
No Flow Setpoint Reduction. This is the amount that the main process PID setpoint will be
reduced by in order to test to see if there is liquid flow.
Parameter Description
Pr 0.059
Over-cycle Mode. Disabled (0), over-cycle detection is disabled. Alarm Only (1), Pr 29.131
indicates when the over-cycle threshold has been reached this hour. Trip (2), the drive
trips Over-cycle when the Over-cycle Starts Per Hour Pr 0.061 is reached. Inc Setpoint (3)
the main process PID setpoint is automatically increased to prevent the system from going
to Sleep when the over-cycle limit is reached.
Pr 0.060
Over-cycle Starts Per Hour. The Over-cycle Mode Pr 0.060 is actioned when the number
of starts per hour threshold is reached.
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