BENSHAW RSi SG Series, Instruction Manual

Page: 159 / 218

Chapter 6 – Parameter Description [APP]
6-71
When the flow
increase
When the flow
decrease
Start
Stop
Aux. Motor
Start/Stop
Frequency rise due to APP-58
Output
Frequency
Aux start DT(APP-58)
Stop freq1
(APP-51)
Starting
Freq. Aux stop DT(APP-59)
Frequency drop due to APP-59
Flow
Start freq 1
(APP-44)
APP-58: Delay Time before Starting Aux. Motor
APP-59: Delay Time before Stopping Aux. Motor
APP-60, 61: Accel/Decel time when the number of
pumps is increasing/decreasing
Sets the delay time before starting the auxiliary
motors.
Sets the delay time before stopping the auxiliary
motors.
APP-60 and APP-61 set the acceleration and
deceleration time of the Main motor when auxiliary
motors are added and removed.
Aux.Motor Start/Stop with MMC
APP-62: PID Bypass Selection
This parameter is used to bypass the PID operation
selected in APP-02. Change this parameter to ‘Yes’
when using the MMC function without PID control.
The output frequency is determined by actual value
(feedback) instead of PID controller output. The
actual value is also used as the Start/Stop reference of
Aux. motors.
The following figure shows the running pattern with
this function applied for controlling the flow rate of a
tank. To control the flow rate proportional to the
water level of a tank, divide the water level in the
tank into the region for the number of Aux. motors
plus one, and map each region by starting frequency
to maximum frequency. The drive increases output
frequency to lower the water level in the tank when
the water level in the tank rises. When reaching
maximum frequency, the drive connects auxiliary
motors as needed. After connecting an auxiliary
motor, the drive starts again from the starting
frequency. By selecting APP-62 [Regul Bypass] to
‘Yes’, PID operation is disabled and Control Mode is
changed to ‘V/F’. PID Bypass is available only when
DRV-04 [Freq. Mode] is set to ‘V1’, ‘I’ or ‘Pulse’.
PID bypass with Main motor and Aux. Motor
APP ► Aux Start DT
58 5.0 sec
Factory Default:
5.0 sec
Factory Default:
5.0 sec
APP ► Regul Bypass
62 No
Factory Default:
No
APP ► Aux Stop DT
59 5.0 sec
APP ► Pid AccTime
60 2.0 sec
Factory Default:
2.0 sec
APP ► Pid DecTime
61 2.0 sec
Factory Default:
2.0 sec
Output
Frequency
Max. Freq.
Starting
Freq.
RUN
STOP
RUN
STOP
H-min H-max
Water Level in
a Tank
Main Motor
Aux. Motor