eTower Installation Manual Revision 0
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2.2.8
RS485 dual interface inter-module communication bus RJ45
plugs
This RS485 bus is used to link the communications of all parallel connected modules in the
tower so that relevant data can be received by Address Number 01 Module (Module 01),
which is in turn relayed from Module 01 to the inverter over CAN Bus or RS485. There are
two ports on each module so that the communication cables can be “daisy chained” across
all the modules. These cables are standard ethernet cables, and one is included with each
module that is made to the exact right length to jump from one module to the next adjacent
module whether mounted on the pedestals or in a 19” rack.
2.2.9
Digital Output Dry Contacts (DCT)
The
Digital Output “Dry” Contacts (DCT) include DO1 (pins 1 and 2) and DO2 (pins 3 and 4),
which are normally closed potential free contacts. DO1 opens when the battery has any
type of fault protection enforced. DO2 opens the battery raises a low State of Charge alarm.
Do not exceed 2A though these contacts. If a higher current is required to drive your
external device use an interposing relay that is controlled by the battery and in turn controls
your external device that requires more than 2A.
2.2.10
Reset Button
Reset Button – When the battery is in a dormant state the reset button can be pressed with
a suitably narrow object to “wake up” the BMS. If the battery is in a fault or alarm state, the
reset button may be pressed to clear the alarm or fault to restore normal operation. The
button must be pressed for about five seconds to initiate a reset – while holding the reset
button down, the SoC indicator LED’s should cycle right to left and then left to right. Once
this initial LED sequence begins you can let go of the button.
2.2.11
Positive Terminal
The positive terminal is equipped with two fastening points supplied with M6x16mm bolts
to accommodate interconnecting busbars and cable lugs. Busbars must be staggered to
alternate between left and right terminals when connecting towers of two or more
modules. See Figure 2.3 showing a four-module eTower. The top module is fitted with two
35mm
2
cables to accommodate the maximum power capability of the battery stack. One
cable lug is fitted onto the same terminal as the busbar and the other cable lug onto the
second terminal.
