Press Controls

WHY ISB CONTROLS?
Our design does not depend solely on redundancy or reliability of components. Our philosophy goes beyond these basic safety bench marks. We take the press operation very seriously and over the years we have seen every possible mode of failure and have carefully adopted the appropriate measures.

Basically, we would like you to become a benefactor of our years and years of collective experience. An experience that is backed by a solid and unique ISB Loop-Check design.

This design ensures that events take place within the designated location of a press revolution along with uninterrupted overlays and timed circuits. Like clock work, an unexpected or absent input will generate a stop signal.

Barring a catastrophic mechanical failure on the press, the ISB concept, properly installed, is infallible and the most reliable control in the market.

WHY CLUTCH CONTROLS?
A press is a sophisticated hammer... It can deliver thousands of pounds of pressure with each stoke. In the case of a mechanical press, this energy is stored in the flywheel and transmitted to the ram via a clutch, usually an air activated clutch, and inversely, the motion of the arm is stopped using an air brake. The task of proper and timely activation of the clutch and the brake is dependent on the proper design of the controls and selection of safe solenoid valves. OSHA's regulation covering Mechanical Power Presses, 1910.217, specifies the use of reliable controls and brake monitoring systems.

OSHA Requirement 1910.217 for mechanical press:
(b) (13) Control Reliability
"... The control system shall be constructed so that a failure within the system does not prevent the normal stopping action from being applied to the press when required, but does prevent initiation of a successive stroke until the failure is corrected..."

HOW ISB MEETS OSHA REQUIREMENTS
The ISB Control System is all solid state, based on a single microprocessor system. The output circuits are TRIAC driven relays, each of which drives one side of the dual solenoid valve. This provides for monitoring of the outputs. All inputs, such as limit switches, cam switches, palm buttons, etc... are monitored by the microprocessor.

The unique output circuits prevent malfunction due to processor failure or component failure on the Control PC Board. When an ISB light device is incorporated with the system, the system checks the output of the light device before each stroke can be initiated. The ISB Press Control System is conjunction with the Light Barriers, can increase your production by as much as 30 to 150%. All ISB Controls are provided in rugged NEMA 12 enclosures.

BRAKE MONITOR: A top stop overrun cam and limit switch is provided to detect the excessive travel of the press when stopping at top. A properly set cam will signal the press to inhibit another cycle if the press fails to stop within its limits. An electronic brake monitor with a stop time readout can also be supplied as an option if monitoring the brakes during an entire cycle is desirable or to display the stopping time. Safety devices must be located at a distance using the following formula D=Tx0.63. For greater detail consult OSHA 1910.217. 

CONTROL FEATURES

MOTION DETECTOR: The motion of the press is monitored for proper direction and correct rotation of the cam box by comparing sequence and overlaps of cams with the brake monitor limit switch.

CONTROL RELIABILITY: All ISB controls meet and exceed all current OSHA and ANSI applicable current standards. The processor constantly checks for the proper sequence of all inputs with every cycle of the press. MOTION in the rotary cam limit switch box as well as other safety systems are monitored during each stroke of the press. Diverse redundancy and circuit cross-checks provide control reliability.

ANTI-REPEAT: This feature insures that the press will not recycle at the end of a stroke without a regenerated signal to start.

ANTI-TIE-DOWN: This feature requires the release of all actuating mechanisms each time the press stops prior to reactivating the press.

SYSTEM SAFETY (ISB MUTE PALM BUTTON MODE): When properly installed and maintained, all elements of the system will be checked for proper use. The control will not allow the negation of a reliable safety system and will monitor its use. The light curtain will be allowed to be muted or bypassed only when in the palm button mode while in single or inch only.

AUXILIARY SHUTDOWN INPUT: This input, when off, causes an immediate shutdown and requires a reset before another stroke is enabled.

AUXILIARY TOP STOP INPUT: This input, when off, will cause a shutdown at the next top stop position. Typically used for a tonnage monitor.

FAULT MONITORING: Up to 8 LED indicator lights are provided. The control will monitor several fault conditions and indicate the cause of the fault.

INPUT INDICATORS: Green LED indicators are provided for all inputs, to allow the user to quickly detect if a signal to the control is missing or out of sequence.