Design Criteria of Press
Safer, More Productive and Easier to Use
The following descriptive writing is the base design criteria for the Pressroom Electronics' punch press control
system. The inherent design features are superb for enhancing production and safety. Please note that options are
available within each individual system or package to aid in production.
Complete self-checking dual logic microprocessor based punch press controls with two independent running control
channels and a comparison circuit. The comparison circuit assures that both channels agree as the punch press
control sequence occurs. The preprogrammed dedicated inelastic control system prevents in field alterations to the
safety features of the control. The control incorporates a control reliable redundant design concept to assure a
higher level of safety and reliability.
Control Reliability "Control Component Failure"
The Pressroom Electronics' Punch Press Control meets or exceeds all OSHA 1910.217 and ANSI B11.1-2001 standards for
control reliability. Control reliability standards require that clutch/ brake circuits be designed and constructed
so that a single failure or fault within the system does not prevent the normal stopping action from being applied
to the press when required, or does not create an unintended stroking action, but does prevent initiation of a
successive stroke until the failure is corrected.
Redundant Design Concept
The Punch Press Control system utilizes the redundant design concept. This gives the clutch/brake control system a
higher level of redundancy and control reliability.
Diagnostic Message Display
Standard on the solid state Pressroom Electronics Punch Press Control System is the "Diagnostic Message Display"
Mounted with the operator controls at customer designated location on the control panel, the alpha-numeric message
display informs the user of any faults, failures and the current operating status of the punch press control
system. The messages are in plain English and will give the press operator and front line supervisor information
quickly and safely. The "Diagnostic Display" system is so advanced that it will immediately inform the user of such
problems as pressure switch faults, failed output relays, or rotary cam mis-adjustment. The system will also
pinpoint internal printed circuit board faults for immediate replacement. This self-diagnostic feature will save
maintenance dollars and will enhance machine uptime measurably due to the units captive troubleshooting ability.
Best of all, this information is supplied without even opening the control panel door. Additionally, a complete
series of LED's (light emitting diodes) are mounted on the clutch/brake module for visual status of all inputs and
outputs related to the machine cycle status.
System Logic and Component Diagnostics
A combination of LED's and alpha-numeric plain English message display will enhance in-field troubleshooting
greatly. The advanced design can even troubleshoot itself and advise the user if a printed circuit board is
defective and if it needs to be replaced or repaired. Diagnostics are for both the control system logic and for
punch press component monitoring. Twenty-nine different messages can appear on the message display.
Redundant Captive Contact Safety Relays
Redundant relays assure safety if an output relay should fail. The system utilizes safety relays which have
force-guided contacts. This is a configuration where the contacts are mechanically locked together so that if one
set of contacts weld, the other contacts cannot change state. If one should fail, the message display will identify
which relay has faulted and what state the relay should be in (on/off).
Pressroom Electronics Solid State Punch Press Controls
Incorporates "cross checking, self-checking and redundancy" to assure an ultrasafe design.
Interrupted Stroke Provisions with Indicator
If the punch press is in the "single stroke" or "continuous" mode and the press stops before the completion of a
full stroke, the Interrupted Stroke Provision is activated. The control will automatically switch to the "inch"
mode and the palm buttons must be used to return the ram to the top of the stroke. When back at the top, the
control automatically switches back to the original operational mode setting and the operator may resume normal
production. The Interrupted Stroke Provision improves productivity and safety significantly by eliminating the need
for the operator to make mode selection adjustments on interrupted strokes.
Controlled by keyed selector switch on/off on the control panel, Micro-inch provides ram movement for a
predetermined amount of time. Micro-inch is actuated by the palm buttons and the amount of ram movement is
controlled by a Micro-Inch timer inside the control panel. Micro-Inch also indexes the ram in increments that eases
set-up in high speed or short stroke press operations.
Automatic External Trip (optional)
Controlled by a keyed selector switch on/off on the control panel. This option enables a punch press/press brake to
be cycled by a signal from a robot or feeding device one stroke at a time.
Continuous on Demand [Pause] (optional)
Controlled by keyed selector switch on/off on the control panel. Designed per ANSI Standard B11.1-2001 Section
220.127.116.11.6. Click here for a detailed description of this optional feature.
Print this page