SECTION 1
General Description
The system is an integrated control for a stretchwrapping machine. It includes three DC
motor controls:
• Carriage control, reversing.
• Turntable control, fully programmable via keyboard interface.
• Multistretch control, fully programmable via keyboard interface.
The 755 control comprises three principal sub-assemblies:
• Keyboard and display - for setting and viewing the system parameters. (Type 755.1 Fig. 1)
• Microprocessor board - overall system control (Type 755.2 Fig. 2)
• Motor control and interface assembly (MCIA) (Type 755.3 Fig. 3)
These items are mounted and wired inside of enclosure or front panel plate mounted to the
machine. The membrane switch/display operator interface is on the door of this enclosure.
1.1 Reference Drawings
DWG. # 302 452 rev. 2
DWG. # 302 453 rev. 2
1.2 Description of Sub-Assemblies
• KEYBOARD AND DISPLAY Type 755.1
This board contains 12 keypads and three, seven-segment display modules (three
digits). It is used to start an automatic wrapping cycle, or to operate the machine
manually, and also to set and adjust the control parameters (carriage speed, film
tension value, and turntable speed, etc.). It is mounted on the enclosure door, behind
the membrane label. The keyboard communicates with the microprocessor board
through a 28-pin connector (P1).
• MICROPROCESSOR BOARD Type 755.2
Contains the system microprocessor, E
2
PROM memory. This board generates the
reference and control signals for the three machine drives: carriage, turntable and
multistretch. It plugs into, and mounts behind the keyboard/display, connected to the
MCIA by a 20-way ribbon cable.
• MOTOR CONTROL AND INTERFACE ASSEMBLY (MCIA) Type 755.3
This assembly comprises of a motherboard, power supplies and card rack, which is
plugged into three distinct DC motor controls. This DC motor control regulates the
function of the machine (multistretch, turntable and carriage). The motherboard houses
the reversing relays for the carriage, and connectors to interface with machine. It also
includes two regulated DC supplies - +5 VDC for the microprocessor board, and
+24VDC for the hall effect device (which senses position of multistretch dancer roller
and photocell).
Page 2
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