Centron Technologies MS930A, Service Manual

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3 - 1
3. System Description
3-1. General
The Segmentation System consists of the control unit, the segmentation unit and an
inter-unit cable assembly.
The control unit contains one control circuit board and 3 - 7 pieces of power supply and
RF board, depending on the model. E.g., MS950A/E has 5 power supplies and RF
boards. The segmentation unit has same number of sealing head unit and a signal
distribution board in the base plate. All sealing head units are identical in configuration,
but only the trigger lever in the sealing head unit mounted at #1 position works.
The inter-unit cable assembly is a bundle of data cable and RF coaxial cables.
Refer to [Figure 3-1] to find overall system configuration.
The control board in control unit contains all logic circuits and timing gates. It
receives trigger command signal from #1 sealing-head unit, and controls overall
function of this equipment. RF board assemblies locate in control unit, which are high-
power RF oscillator-amplifiers generating RF power, and sends RF power to all
sealing-head units through inter-unit cable assembly.
Each sealing-head unit consists of a solenoid, sealing electrode, matching board
assembly, trigger board assembly, micro-switches and a ENABLE/DISABLE switch.
The ENABLE/DISABLE selector switch is prepared on the rear panel of each sealing
head unit. If the selector switch is selected at DISABLE, the sealing head unit does not
work even if an ENABLE command is given in remote command mode. Matching
board assembly has an impedance transformer. Trigger board assembly has a trigger
micro-switch and two indication lamps.
Following paragraphs describe theory and function of each assembly in detail.