©
2017 Sensata Technologies
Page 72
Operation
4.13.2 Network Communication between each Stacked Controller
When multiple PT controllers are networked together in a stacked con
fi
guration per Section 2.11
(Stacking Installation - Wiring Multiple PT Controllers Together), they operate as listed below:
1. The controller con
fi
gured with the lowest network address (using DIP switches 7, 8, and 9) is
the master controller and all other controllers networked together become slave controllers (and
therefore follow the master).
Note:
You can manually scroll thru the display on the front of each
PT controller to determine the controller with the lowest address (see Section 4.13.1).
2. All slave controllers communicate with the master, and the master communicates with the remote.
3. The charge mode (Bulk, Absorb, Float, or EQ) of the master controller dictates the charge
mode of the slave controllers.
4. The target voltage (Bulk, Float, or EQ voltage setting with temperature compensation) of the
master controller dictates the target voltage of the slave controllers.
4.13.3 Network Communication from Stacked Controllers to Remote
When multiple controllers are enabled to stack and are networked together, the information below
is communicated from the master controller and shows in the remote’s PT menus:
• PT Meter Menus
a.
PT Status:
• PT Status - Highest priority is to show any fault for any networked controller. If there are no
faults, then the charge mode of the master controller is shown.
• Power Status - When all the controllers have the same P-status number (P0#), then this P-status
shows. When the P-status is different between the controllers, then the P-status is shown in
order of priority; such that, if any controller has a P01 or P05 - it shows, then P04, and then
P03. If none of these previous P-status conditions occur, then P02 (if the output current is
being regulated) or Pon (if PT controller is at its maximum output current) can show.
• Relay Status - Status of the relay of the master controller (engaged or disengaged).
b. PV Voltage - Highest PV voltage to any controller.
c. Battery Voltage - Battery voltage to the master controller.
d. Target Voltage - Temperature compensated voltage of the master controller.
Note:
If a BMK is
installed in the system, the BMK’s DC voltage will be used when determining the Target voltage.
e. Battery Current - Total output current from all the controllers.
f. Power to Battery:
• Now: Total PV power to the battery from all the controllers - occurring now (in Watts).
• Lifetime: Total PV power to the battery from all the controllers - since they were installed.
• Reset: Total PV power to the battery from all the controllers - since the last time it was reset.
g. Ground Fault Current - Ground fault current detected.
Note:
Only the Master controller in a
stacked con
fi
guration should have a GFDI fuse installed.
h. PT Data (recorded daily):
• Harvest - Total kWHr delivered to the battery from all the controllers (shown as a whole number).
• Max PV - Maximum PV voltage (and the time it occurred) from any controller.
• Max Bat - Maximum battery voltage to the master controller.
• Min Bat - Minimum battery voltage to the master controller.
• On/Work Time - Cumulative time there is any active PV production to any controller (counts if
any controller is charging).
• Max Power - The combined maximum/peak power (and the time it occurred) of all controllers.
i. PT model - Shows the PT model if every stacked controller is the same model.
Note:
If this
display shows
PT00
, then there are multiple PT controller models. In this case, you can view the
Model/Serial Number label on each controller to determine the model.
j. PT Version - Shows the PT software version if every stacked controller has the same version.
Note:
It should show version 1.0 or higher; however, if this display shows 0.9, then there are
multiple software versions between the stacked controllers. In this case, you can perform a Power-
up Test (see Section 2.12.2) to view each controllers display to determine the software version.
