Armstrong Design Envelope 4372 - PARALLEL SENSORLESS PUMP CONTROL (PSPC)

installation &
operating instructions
Design Envelope 4322 & 4372
Tango Pumping Unit
48
This control will take advantage of the 5.4 Quadratic Curve
Control mode, where the pump will decrease speed to maintain
a maximum flow setting. This will prevent over-pumping and
save energy costs. Over-pumping is common in hvac systems
as pumps are typically oversized for the application. Pump
controls can only control the flow to a minimum speed; thus a
dry-contact relay is supplies which will close when maximum
flow is reached, which can be used for an alarm or other device.
0
0
20 40 60 80 100
200
400
600
800
1000
1200
120 140 160 180
head
flow
target curve
Maximum Flow Setting
5.7 quadratic curve control with minimum
& maximum flow protection
This control mode combines the control logic of 5.5 & 5.6
which takes the values of the quadratic control curve and
protection for both the maximum & minimum flow limits. Pump
controls can only control the flow to the motor limit or maxi-
mum / minimum speed limits of the unit, thus a dry-contact
relay is supplies which will close when either the minimum or
maximum flow is reached, which can be used for an alarm or
other device.
0
0
20 40 60 80 100
200
400
600
800
1000
1200
120 140 160 180
head
flow
target curve
Minimum & Maximum
Flow Settings
5.8 parallel sensorless pump control (pspc)
This configuration maps the quadratic control curve into the
pump controls and ensures the system flow requirements are
met, while staging the pumps on and o to maintain optimum
pump energy usage. This is accomplished by operating the
pumping units at the best pumping eciency level for the
required flow.
This control is available for 2, 3, or 4 Design Envelope pump
units operating in parallel. Tango and dualArm units have Paral-
lel Sensorless Pump Control (pspc) pre-programmed in the
controls at Armstrong factories. For all other models (except
twin pumps), pspc can be enabled aftermarket; please contact
your local Armstrong factory for details.
head
eciency
flow
1-pump
1p e 2p e 3p e 4p e
2-pumps
3-pumps
4-pumps
pspc control curve
Both individual pumps and total parallel flow can be monitored
by accessing Settings -> Pump -> Control Mode -> Parallel
Sensorless
5.8.1 embedded parallel sensorless pump
control for multiple pumps
If the Parallel Sensorless Pump Control option was purchased
for control of 2, 3 or 4 single pumps (VILs and End Suctions)
the function can be enabled at any time. Note that pumps must
be of the same model for parallel operation.
Start by installing a wiring bridge between the pumps (supplied
by others). The wiring between the control cards is a canbus
(3-wire) cable with terminal blocks at each end (3 position
strain 3.81 mm).
For connection of 3 or 4 pumps, the canbus connectors should
be daisy-chained together.
Wiring bridge supplied by others.