205020 OTS Standalone Manual - 第20页
OVER THE TO P SNUGGER (OTS) OTS CONTROL RAIL 1.8 Over the T op Snuggers (OTS) Manual Chapter Issue 3 Aug 14 V acuum valve (5) contro ls the vacuum gener ated by the ventur i valv e. The vacuum gene rated is used to r ele…
OVER THE TOP SNUGGER (OTS)
OTS CONTROL RAIL
Chapter Issue 3 Aug 14 Over the Top Snuggers (OTS) Manual 1.7
The over top plate valve (3) controls a pair of double acting cylinders which
cause the plate to extend or retract. A pressure regulator controls each action;
the regulators are factory set and must not be adjusted. Two speed controllers
are employed to control the speed of the over top clamp retract movement; this
prevents board movement at the end of the clamp sequence. If a clamping
problem persists escalate it to Customer Support Group. Air lines to and from
the over top clamp cylinders are coloured red.
Top plate up/down valve (4) controls the top plate movement. Speed controllers,
in the top plate up line, are used to prevent board bounce during unclamping.
Air lines to and from the over top clamp cylinders are coloured yellow.
Over Top
Cylinder
Over Top
Cylinder
Out
Out
In
3A
3A
Speed Control
3B
3B
In
Valve 3
Overtop Clamp Extend/Retract
Top Plate
Cylinder
Top Plate
Cylinder
Speed
Controllers
4A
4B
Valve 4
Top Plate
Up/Down
OVER THE TOP SNUGGER (OTS)
OTS CONTROL RAIL
1.8 Over the Top Snuggers (OTS) Manual Chapter Issue 3 Aug 14
Vacuum valve (5) controls the vacuum generated by the venturi valve. The
vacuum generated is used to release the brakes in the mid plate.
Snug and brake valve (6) combines both actions, when on, the snug and brake
are activated, when off the vacuum is used to pull the brakes back (provided
valve 5 is on.)
The programmable ITV valve is used to proportionally control the snug pres-
sure.
Air lines in this part of the system are coloured black.
Brake
VAC
Generator
6A
Snugger
Pressure ITV
Valve 6
Snug & Brake
Valve 5
Vacuum
Snugger Cylinder
7A
7B
OVER THE TOP SNUGGER (OTS)
OTS CONTROL RAIL
Chapter Issue 3 Aug 14 Over the Top Snuggers (OTS) Manual 1.9
Programmable
ITV
The programmable ITV valves take electrical inputs and convert them to a
proportional pressure output. The output is dependant upon the upper level set
at the machine input supply solenoid.
The valves comprise a control circuit which performs the voltage/pressure
conversion, an exhaust valve which discharges excess air pressure, an air
supply valve which controls the output pressure for the specific function and a
pressure sensor which provides feedback to the control circuit.
In the OTS system, two functions are programmable: clamp pressure and
snugging pressure; for details on how to set these, refer to the programming
section of this manual.
Vacuum Ejector The vacuum ejector valve provides vacuum to release the brakes. Sixteen
brake cylinders are used giving a maximum holding power of 20Kg print
pressure.
The brakes are applied during the clamp on sequence, they are released during
the unclamping sequence. The valve works on the venturi principle where air
is evacuated through a tapered venturi tube creating a vacuum.
-
Control Circuit
Air Supply
Valve
Out
Out
Exhaust Supply
Valve
Discharge
Input Signal
Output Pressure
Pressure Sensor
+
Air In
Vacuum
Venturi
Silencer
Circuit Symbol