Xylem IM043 AQUAVAR Variable Speed Pump Control - Manual (Page 50)

multiple Pump Constant Pressure... continued
Source Required Value
The next screen refers to the use of a second input signal for changing the required value. This was
discussed in Section VIII.
If a second sensor or switch is used, you must tell
the AQUAVAR which pump has the connection. Use
the and keys to select. ADR1, ADR2, ADR3 or
ADR4. If you are not using a second sensor, leave this set to “off”.
Follow the other steps in Section VIII for using a second sensor with multiple pumps.
11. Synchronous Control: If you choose synchronous control, the second pump (and 3 or 4) will
all try to regulate the pressure together by running at the same frequency (speed). In order to
get the second pump to shut off, you need to set a minimum frequency.
• To choose synchronous control hold
to enter the submenu.
• When synchronous limit appears use
to set the frequency for pump #2 to
shut off. For 60 Hz pumps, this would
normally be 50 hz.
• If pumps 3 and 4 are used, advance to the
synchronous window with
• The window can be set between 0-10 Hz.
This number will be added to the synchro-
nous limit. For example, if the synchronous
window is set at 5 hz, pump four will turn
off when all pumps go below 50 hz, and
pump three will turn off when all pumps
go below 45 hz.
Programming
49
The synchronous option can only be used if all pumps are the same.
Note
SUBMeNU SyNCh. CONTROL
SyNChRON LIMIT - DISABLeD
t
SyNChRON LIMIT - 50 hz
SyNChRON WINDOW - 0 hz
SyNChRON WINDOW - 5 hz
SOURCE REQUiRED VALUE
ADR1
t
t
*
*