24
7.4 Daisy-chain multiple DynaDrive systems
It is possible to run two DynaDrive pumps in parallel, with a shared discharge line. This can be particularly
useful in applications where the system’s maximum flow rate can be significantly higher than the system’s
minimum flow rate. For example: if DynaDrive needed a flow rate demand of up to 140L/min (37 gallons/
min) at a pressure of 400kPa. Running two DynaDrive DD90-11 systems in parallel with common discharge
would accommodate this. One DynaDrive would be designated as the LEAD, with the remaining DynaDrive
designated as a LAG. Each DynaDrive would require its own pressure transducer. When making changes to
settings in the system, only the LEAD can be adjusted.
On initial startup, the DynaDrive designated as the LEAD will be the first pump to start. The LAG DynaDrive
will come on if the first pump is unable to maintain set pressure, even when running at 100% speed. The
next time water is in demand, the LAG pump will come on first. This sequence is referred to
as auto-rotate. To wire up the LEAD and LAG pump, refer figure 7.10.
Figure 7.10
Alarm monitoring option
- see section 7.5
The connection between the DynaDrive controllers requires 2 x 0.25mm (24 AWG) cable. From one
DynaDrive, use the “COMUNIC” terminal 2. Wire to the “COMUNIC” terminal 2 of the second DynaDrive. To
complete the circuit, from one DynaDrive, use the “COMUNIC” terminal 3. Wire to the “COMUNIC” terminal
3 of the second DynaDrive. Davey suggests limiting the distance between the pumps to 2m (6½ feet). To set
up multiple DynaDrive to run in a common manifolded system use the following:
To set the DynaDrive to recognise the daisy chain configuration:
• Ensure
automated control
is turned off. To turn the automated control off, push the
Automatic on /
manual off button
.
• The green
Automatic LED
will turn off, see figure 7.8;
Summary of Contents for DynaDrive DD15-35NPT
Page 31: ...31...
