Xylem 19-001-350R2 PACE Integrated Pump Controller Human Machine Interface (HMI) for the Silent Storm VFD Pumping System – Technician Guide - Manual (Page 20)

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This is the final System Setup Screen. Tap
[Previous] to move to the prior System Setup
screen or tap [Setup] to return to the menu.
FIELD SETUP
Tap [Field Setup] from the Setup menu.
Figure 47: PID Settings
After the pumping station is configured with initial
values at the factory, field technicians can use the
four Field Setup screens to tune or optimize the
station operation.
You can navigate the status screens for each
device that has been set up by tapping [Previous] or
[Next].
NOTE: The screens described below will only be
displayed if they are applicable to the current
system.
PID Tuning
All fields which have been grayed out are read only.
Figure 48: PID Settings
PID Group:
There are 5 PID sets available for use that are
chosen by which pump(s) are running on VFD.
Pumps using this PID Set:
The decision on which PID set to use is based on
the “best” fit of pumps running on VFD and the
pumps selected here.
Read:
Click “Read” to read the PID values from the PID
group set selected (this is automatically clicked for
you when you enter the screen).
Write:
Click “Write” to save the values to the PID group.
Copying PID data:
The Read/Write buttons are provided to allow the
technician to copy values from one PID group to the
other. To copy, select the PID group to copy from
and click “Read”, then select the PID group to copy
to and press “Write”.
Speed Test:
Speed test is a method to shut down the lead VFD.
When only 1 VFD is running. The PID value is
artificially reduced and the system is monitored for
PID response (pressure drop).
Speed Test shutdown is initiated when flow falls
below “Flow “ for “Delay” seconds.
“Speed” is the speed to which the PID must drop to
pass speed test and shut down the pump.
“Period” is the time between steps for the speed
test routine to lower the PID output, and “Step Size”
is the amout of PID drop per step.
If the speed test routine detects the PID ramping up
during the test, speed test will abort and operation
will return to normal until flow is again below the
“Flow” setpoint for “Delay” seconds.
Proportional and Derivative settings, high and
low flow:
Configuring the proportional and derivitave values is
essentially a trade-off. Both these values have an
impact on the system response. A high proportional
value causes the system to respond faster, thus
reaching the setpoint faster. At the same time, this
faster response means, that the system will easily
overshoot the desired setpoint. This can be
checked by lowering the proportional value, and
increasing the derivative (d-Term) value. The
integral value controls the sampling rate of the PID
loop. The derivative term controls the systems