A capacitive, presence sensing device designed for machine guarding and personnel
A capacitive, presence sensing device designed for machine guarding and personnel safety applications.
Features microprocessor-based electronics, automatic tuning and sensitivity adjustments, continuous self-check circuitry, warning output, enhanced relay protection (includes welded contact detection) and ability to handle up to 150 linear feet of antenna.
Principles of Operation
The PC1000 Proxagard® system components are: a control unit, a coupler, and a customer-supplied antenna.
The control unit interfaces electrically with the coupler, by means of the coupler cable. The coupler is electrically and mechanically connected to the antenna, which is constructed near or around the area to be guarded.
The coupler generates an electromagnetic field which surrounds the antenna. Any intrusion into the field by personnel, machinery or metal parts causes a change in the field. The control unit detects this change and opens the control relay in the Stop Output circuit, which can be used to remove power, apply a brake or perform some other desired safety function. The Stop Output also has a safety relay, with its contacts wired in series with those of the control relay. The safety relay works in conjunction with an armature configuration in the control relay that allows a welded relay contact to be detected, and opens the Stop Output if a contact weld occurs. A separate, adjustable Warning Output provides a means to alert personnel to the fact that they are in the sensing field - this feature helps to eliminate unintended machine stops.
On initial power-up, the Proxagard® tunes automatically with the system sensitivity defaulted to maximum. The keypad allows the authorized user to retune and alter the sensitivity or warning settings; these new settings are stored in memory and become the defaults for subsequent power-ups. An access code prevents unauthorized keypad entry. The keylock is needed to allow the acess code to be entered. It becomes a second level of security to reduce operator adjustments to the system. The alarm point and field activity are displayed on a bargraph, during normal operation.
The self-check circuit, which monitors the control circuitry, operates continuously and is independent of machine cycle. In the event of a self-check fault, the Stop Output opens and a fault code is displayed on the bargraph.
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