3.1 Dispenser Connection Board
The dispenser connection board combines the iGEM AC Relay board and the DC Distribution
board and centralizes all the power sources into one location. Current loop and data communi-
cations are also distributed from this board. AC power from the dispenser junction box comes
into this board at J8. The board provides AC power to the relay select lines an all other compo-
nents. The connection board also provides AC to the power supply, which returns 24 VDC to
the connection board where it is distributed to all other boards and modules in the electronic
head. The dispenser connection board also provides connections for future optional components.
3.2 Dispenser Power On/Off Switch
The dispenser AC power switch is located on the chassis near the upper left corner of the iGEM
board. AC power from J56 on the dispenser connection board goes to the dispenser ON/Off
power switch. This switch will turn off power to the components on the connection board, therefore,
all electronics in the head are shut down. See the Warning below related to the switch and the
detailed Warning in the Replacement Procedures section.
WARNING! Turn the dispenser switch off when servicing the electronic boards and modules,
however, keep in mind that AC voltage will still be present at J8 on the Dispenser Connection
board. Turn power off at the dispenser circuit breaker inside the building when working on or
near the dispenser connection board.
3.3 Heater/Fan
The 290W heater requires 100-230 VAC (NA) or 220-240 VAC (IEC) The fan requires 24 VDC,
and it is always on regardless of the temperature. This heater is designed to use less power
than previous heaters. The heater setting is determined by the rotary switch on the bottom of
the assembly. The normal setting is the "E" position. The "0" position will turn the heater off
completely.
The setting on the switch determines the temperature at which the heater turns on. As the tem-
perature inside the electronics head gradually approaches this temperature, the heater gradually
reduces output, and, therefore power usage, until it approaches the set temperature.
3.4 Sales Volume and Unit Price Displays
Displays in Helix dispensers have white LCD digits or characters with a dark blue background
that uses transflective backlighting technology. The micro-controller on the sales display controller
board processes the data from the iGEM computer. 24V check points are at J10 and J11. To
the right of these connectors is a green LED that indicates 5V.
The Unit Price Display (UPD) controller board receives all communications, power and data from
the sales display controller board using RS-485 communications. An Ethernet cable is the only
connection between the two controller boards. A green LED in upper left corner of the UPD
controller board indicates 5V.
WM048523 Rev 08 01/2019 27
3 Electronics
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