Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 90)

Digital I/O Duplex Control Mode
Terminal Number Parameter Number Lead Lag Description
27 5–12 Setpoint increase Pump Exercise Input When operating as
the lead pump, this
input will increase the
setpoint when both
pumps are on to
compensate for the
additional flow of the
lag pump. This
effectively performs a
flow compensation
function. When
operating as a lag
pump, this input acts
as the Pump Exercise
Input which will
perform the Pump
Exercise function. See
Duplex Control in the
Commissioning
section of this manual
for details.
29 5–13/5–31 I am Lead I am Lead Inverse Terminal 29 is
configured as an
output. This output is
used to indicate
which controller is the
lead pump and which
is the lag pump.
32 5–14 Slave Select Slave Select When this input is
high, the other
controller is operating
as the lead pump.
When high, this input
will force the
controller to become
the lag pump or enter
sleep mode if Duty
Standby is enabled.
33 5–15 [23] SP1/SP2 Select [23] SP1/SP2 Select Digital input.
Configured for use as
a Setpoint 1/Setpoint
2 select (SP1/SP2).
Open = SP1, Closed
= SP2.
20 — Common Common supply
Relay and analog output setup
The Relay and Analog Output Setup allows configuration of the onboard relays and
analog output signal.
Operation
88 Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL