VC3500/VC3700 Troubleshooting Manual
Valco Cincinnati
Page 8
Valve Driver board
The Valve Driver board receives pattern information from the CPU board and through the
Interface board at connector J1 for its two channels. Connector J2 is the input for voltages of
30 VAC and 24 VAC for driving valves. A spike voltage of 56 VDC is generated on board
and has an adjustable time duration via a potentiometer. An adjustable hold voltage (5 to 12
VDC) is also generated on board. Connectors J3 and J4 are the connection points for two
valves.
Machine Interface Relay board
The Machine Interface Relay board includes the relay to interface to a machine’s stop circuit
for either a Jam condition or a Glue Inspection fault. Connector J3 is accessible through the
base plate, and it’s mating field-wirable connector is used to make the wiring connection to
the machine’s stop circuit.
Ground References
Protective Earth (Lined ground symbol with circle)
To satisfy the European Community's safety directive, all electrical and electronic mounting
surfaces are bonded to a single point referred to as 'protective earth' and denoted by a lined
ground symbol within a circle. This point is located towards the bottom of the main panel.
On later models, a terminal board (151xx407) is provided to allow multiple connections to
this point.
Input Ground (Lined ground symbol)
In order to provide noise isolation for the logic circuits, a separate power supply circuit is
provided for scanners, encoder, jam signal and dump-valve signal. Bridge rectifier BR2 (on
the Power Supply board) rectifies 14VAC to an unregulated 17VDC. This 17 VDC leaves
the Power Supply board via connector J5 and enters the Interface board via J7. A 12V
regulator (U1) on the Interface board supplies a regulated 12 V supply voltage for scanners
and encoder.
Valve Output Ground (Filled triangle ground symbol)
The power source to drive glue valves comes from transformers XF1 (Peak voltage) and XF2
(Hold voltage). In order to provide noise isolation for the logic circuits, these supplies are
isolated from other references via -isolators on the Interface board.
Logic Ground (Open triangle ground symbol)
Logic ground is isolated from chassis (earth) ground and is used as a reference for all other
circuits that do not leave the control.
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 ...