VC3500/VC3700 Troubleshooting Manual
Valco Cincinnati
Page 7
Glue Pressure Control
Analog board
The Analog board determines (along with the EPC-6) the necessary air pressure to be applied
to the glue source from 1.) the line speed determined from the frequency of encoder pulses,
and 2.) the "Glue Pressure" pushbutton/toggle on the front panel. The pressure value
requested, stored in a digital potentiometer, is sent to the EPC module to control the air
pressure. The pressure transducer signal from the EPC-6 is fed back to this board, buffered,
then sent to the CPU board to inform the main processor.
EPC (Electro-Pneumatic Control) module
The EPC controls air pressure to the glue source as a function of line speed. Three air ports
exist on a single manifold mounted to the EPC. From top to bottom, they are:
¨
Shop air input
¨
Speed dependent air output
¨
Exhaust air
User Interface
LCD/Touchscreen module
The LCD/Touchscreen displays glue program and system level parameters. It also provides
the means for user input via a multi-level menu. A “backdoor” PIN code of ‘362436’ can be
used to gain access to menus beyond Menu 2. This code is in addition to a customer defined
4-digit PIN, and should not be revealed to customers.
LED board
The LED board displays on/off status of glue valves, scanners, encoder, and system power
supplies. It also displays whether the line is below or above minimum speed and the jam
condition. Glue valves can be individually "Enabled" for gluing programs, disabled ("0"), or
turned on for purging ("1") using front panel pushbutton/toggle switches. Signals from these
switches are routed through the Interface board to the CPU board.
On a VC3700, indicators display the status of the Glue Inspection process.
Input/Output
Interface board
The Interface board provides a connection point and signal conditioning for the following
signals:
¨
Scanner signal inputs are optically isolated and can be connected to J1, J2, J3, and J4. A
scanner with an operating voltage of 12 VDC must be used.
¨
The Encoder signal input is optically isolated and is connected to J5. An encoder with
an operating voltage of 12 VDC must be used.
¨
A Jam signal, available at J6, is an active-low, open-collector signal that can be used to
drive a relay with a coil voltage of 12 VDC, 150mA maximum.
¨
A Dump Valve Control signal, available at J7, is an active-low, open collector signal that
can be used to control a dump valve circuit of 12 VDC, 750mA maximum.
Summary of Contents for VC3500
Page 1: ...VC3500 User s Manual Software Version 3 X Manual Number MCO35 Manual Release Date July 1999 ...
Page 19: ...Installation VC3500 User s Manual Valco Cincinnati 16 Figure 8 Internal Connections Diagram ...
Page 88: ...VC3700 User s Manual Software Version 3 X Manual Number MCO34 Manual Release Date July 1999 ...
Page 181: ...VC3500 VC3700 Troubleshooting Manual Manual Number MC048 Release Date May 1999 ...
Page 185: ...VC3500 VC3700 Troubleshooting Manual Valco Cincinnati Page 1 System Level Documents ...