PEDROLLO DGF/T M/M 8.5 Manual De Uso Y Mantenimiento página 41

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LENGTH OF MOTOR CABLE: if the cable between inverter and pump exceeds a length of
15 m, it is recommended to install a sinusoidal filter to protect the pump and the inverter from
voltage peaks. For MECHANICAL MOUNTING AND CONNECTIONS see
INSTRUCTIONS
Detailed description of some advanced parameters
Par. First name
OF STOP
FREQUENCY
FOR ZERO
FLOW
Pd iDRY
PRESSURE
(%)
PROMPTNES
RF
S OF
REACTION
OF THE
INVERTER
SWITCHING
FS
FREQUENCY
OF THE
MODULE
(kHz)
).QUICK INSTRUCTIONS
Sets the frequency below which the flow is considered to be lower than the
minimum operation flow
With no flow sensor, to stop the inverter when the requirement of the linked unit
has ended, set the SHUTDOWN FREQUENCY (parameter OF). If the SET
PRESSURE is changed, the SHUTDOWN FREQUENCY will be automatically
upgraded to the new operating pressure. It is possible, during operation, to
update at any time the SHUTDOWN FREQUENCY. It is possible to define the
SHUTDOWN FREQUENCY by directly modifying the parameter OF in
ADVANCED PARAMETERS.
Sets the minimum pressure value (as a percentage of the SETPOINT pressure)
to avoid false DRY RUNNING. The iDRY function prevents the inverter from
being blocked due to DRY RUNNING if the pressure, although lower than the
SETPOINT1, is however higher than a preset percentage of the SETPOINT
pressure; this percentage is defined by Pd parameter.
Sets the speed of response of the inverter to pressure variations
Values can be set, from minimum 1 = slow response to max 5 = very fast
response
Selection of the response value depends on the characteristics of the system
(characteristics and positioning of accumulation vessels and their inflation;
typology of the elements for adjusting the flow rate; the length of the lines,
etc.). In the majority of applications the RF value fixed by default ( RF=4 ) does
not require changes.
Sets the switching frequency of the power module
The FS parameter can be selected from 4 kHz to 12 kHz.
This frequency, in the absence of a sinusoid electronic filter on the cable
coming out of the motor, must be reduced together with any increase in the
length of the cable itself.
NOTE: The length of the cable should not in any case exceed 10 m unless a
sinusoid filter is used.
description
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