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E 2020 Nordson Corporation
Power Distribution and Control
The incoming AC power attaches to this board. This board is relatively simple
and performs the following functions:
AC input voltage configuration is performed using voltage plugs or
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personality plugs. This allows adaption to the intended plant power
source. It also supports improved balancing of power loads by using
all three AC lines in 3-phase systems.
Power contactors which are controlled by an output from the LVC are
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located on this board.
Fuses are located on this board.
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LEDs indicate when AC is applied to the input of the board and when
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the contactor is on.
Supplies AC to the DC power supply.
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Connects to the power distribution expansion board when the unit is
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configured for more than 2 hoses and applicators. All ProBlue Flex
melters with 4 to 8 hoses have this board.
DC Power supply
The power supply converts AC line voltage to a regulated 24 VDC. The input
is from the power distribution board and the output attaches to the LVC. The
power supply is located above the E-Box under the pneumatic cover.
Temperature Control Modules
The temperature controls are intelligent, distributed controls on the Nordnet
serial network that are commanded by the LVC. They control the heaters with
a Proportional Integral Derivative (PID) algorithm based on their RTD sensor
readings. They report status back to the LVC. There are at least two types of
temperature control modules:
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The 6-channel base module controls the internal zones and the first 2
hose/applicator pairs
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The optional 4-channel modules control 2 pairs of hoses and
applicators.
There can be up to four temperature control modules in a system with
eight hoses and applicators for a total of 18 channels.
Resistance Temperature Detectors (RTDs) and heaters are isolated from the
low voltage of the circuit boards. An AC fault on the RTD lines should not
propagate past the affected module.
Description
2-9
Part 1128350_02
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Troubleshooting
