BENSHAW RSi SG Series, Instruction Manual

Page: 164 / 218

Chapter 6 - Parameter Description [APP]
6-76
Aux motor stopping condition
and output (Pressure,
air volume) adjustment
Drive turns off the Aux motors when flow rate or
pressure is too high due to decreased load. To turn off
the Aux motors (maximum 4) automatically, stopping
frequencies for each motor should be set.
Aux motors are disconnected when the main motor
operates at a speed below APP-51~54 [Aux motor
stopping frequency] for the time longer than that set
in APP-59 [Aux motor stopping delay time] and the
pressure difference between the PID reference and
the Feedback value exceeds the set value in APP-72
[Pressure difference for Aux Motor Stop].
APP-51~54: Frequency to turn Aux motors OFF.
It is based on the main motor frequency output
APP-59:
S
hould be set higher than System Delay
Time.
APP-60: This is the acceleration time that sets how
fast the drive frequency is increased after an
Auxiliary motor is turned OFF. It should be set
higher than System delay time because it can
cause the Aux motor to stay off for a longer than
desired time.
APP-72: Set by comparing the pressure difference
between the PID reference and the Feedback
values to determine when Aux motor is turned
OFF.
APP-71: Pressure Difference for Aux Motor Start
APP-72: Pressure Difference for Aux Motor Stop
When using MMC control, these parameters set the
pressure difference between the PID reference and
the Feedback values to determine when the Aux
motors are turned On (APP-71) and Off (APP-72).
APP-74: Pre PID Reference Frequency
APP-75: Pre PID Exit Level
APP-76: Pre PID Stop Delay
APP-77: Pipe Broken
Pre PID operation is a function for smoother PID
operation. For example, before pump operation is
started, Pre PID can be used to fill the pump and pipe.
It can also be used to clear the pump at low speed
before normal operation or to perform Accel/Decel
operations before a machine’s speed reaches a certain
level.
APP-74
[Frequency before PID operation begins]
Enter the frequency to run at during Pre PID
operation.
APP-75
[condition to activate PID operation]
Set the feedback value which when exceeded will
allow the start of normal PID operation. If the
feedback value exceeds the set value in APP-75, Pre
PID operation ends and PID operation begins.
Aux motor
start freq
APP-44~47
Aux motor
stopping delay
time
APP-59
Aux motor stop freq
APP-51~54
Inverter Accel Time when
number of Pump decrease
APP-60
Threshold
Feedback
Pressure Diff Aux
Motor Stop APP-72
APP ► Aux Stt Diff
71 2%
APP ► PrePID Freq
74 0.00 Hz
APP ► PrePID Exit
75 0.0 %
APP ► PrePID dly
76 600 sec
APP ► Aux Stp Diff
72 2%
APP ► Pipe Broken
77 No