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• AUX1 controls for motor run and stop. When the switch is in the OFF position AUX1 is open and the motor
will stop. When it is closed (either HAND or AUTO position) the motor will run. AUX3 toggles between analog
constant pressure and motor speed control by the potentiometer. When the switch is in the AUTO position
and AUX3 is open the drive will operate in analog constant pressure mode. When the switch is in the HAND
position it is closed, and the potentiometer will control motor speed. This is illustrated in the table below.
Table 27 – Function of VFD based on AUX3 status
• Refer to Figure 13 for a diagram illustrating connection of the transducer to Control Terminals. AUX2 must
be closed to run in the Analog CP Mode (Auto), and AUX 2 is ignored when the speed potentiometer is
used (Hand).
• 1.3.1 System Configuration = 6: Analog Constant Pressure Swap Sensors. This configuration allows
the use of two 4-20 mA transducers. The primary sensor is connected to the I1+ and I1- Control Terminals,
with the backup sensor connected to the I2+ and I2- Control Terminals. If the primary sensor fails, the
backup sensor will automatically take control of constant pressure at the same settings. The sensor being
used can also be determined based on the state of AUX3, shown in the table below.
Table 28 – Primary sensor based on AUX3 status
The System Configuration must be in any of the constant pressure modes to enable Pre-Charge of the
plumbing system or Lead/Lag pump control. See Section 0, Pre-Charge and Section 6.4, Lead/Lag Pump
Control for more information.
5.6 Start-Up and Shut-Down Ramp Times
Start-up and shut-down ramp times specify the time required to go from Minimum Frequency to Maximum
Frequency or vice versa. Ramp times and profiles are adjustable by changing Operating Parameters through
the keypad and text display. The factory default setting for 1.1.3.1 STARTUP RAMP TIME is 12 seconds and
1.1.4.1 SHUTDOWN RAMP TIME has been disabled by the default 1.1.11 COAST TO STOP setting of NO.
SUBMERSIBLE PUMP Parameter and Minimum Frequency
Most submersible pump motor manufacturers require the motor to reach 30 Hz within one second to protect
the thrust bearing. The parameter, 1.1.13 SUBMERSIBLE PUMP, limits the time the motor runs below 30 Hz
to one second. Refer to Section 4.1 for detailed instructions. When 1.1.13 SUBMERSIBLE PUMP is set to
YES, the motor speed will ramp to minimum frequency in one second, then ramp to the maximum frequency
in a total of 12 seconds. The ramp time can be changed through the adjustable parameter, 1.1.3.1 START
UP RAMP TIME. The default ramp is shown in Figure 18.
The factory default setting for 1.1.13 SUBMERSIBLE PUMP is YES and 1.1.1 MIN FREQUENCY is 30
Hz.
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