PC1000 Proxagard® System
A Flexible RF Guarding System
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 access 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 bar graph, 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 bar graph.
Meets OSHA Standard 1910.217 (c) (3) (iii)
- Machine Guarding
- Safety Interlock
- Machine Stop
- Parts Detector
- Warning Alarm
- Easily installed by plant electrician
- Complete access and visibility at point of operation
- Antennas are application-specific and can be any shape or configuration
- Antennas can be metal rod, pipe, tubing or flat stock, mounted on insulators
- Cost-effective guarding solution for complex machines or irregularly shaped areas
|Input Voltage||115 or 230 VAC, selectable; single|
phase; 50/60 Hz; +/- 15%
|epoxy encapsulated – impervious to water, dirt & oil|
|Power Consumption||8 VA||Coupler Power Out||1mW maximum|
|Frequency Range||160 kHz – 400 kHz||Coupler Cable||10 feet (3m) standard – longer|
|System Reaction||25 mS||Indicators and Controls||mode indicators: self-check, run, tune, set alarm and antenna fault alarm light|
|Self-Check||continuous, independent of machine cycle||bargraph: displays alarm point and sensing field|
|Antenna Size||up to 150 linear feet (45m) or 750 pF of capacitance||keypad: reset, tune, set alarm and set warning, with access code|
|keylock: prevents unauthorized changes of settings|
|Sensitivity Range||up to 28 inches (711 mm) radius from antenna depends on antenna design|
NEMA 12, industrial plastic
10.2 inches x 6.1 inches x 4.0 inches
(259mm x 154mm x 102mm)
|Stop Output Load Rating||resistive||2.5A, 115 VAC||Mounting||vertical or horizontal – to any bulkhead, chassis or panel|
|resistive||1.25A, 230 VAC|
|inductive||.25A, 115 VAC|
|inductive||.125A, 230 VAC|
|Stop Output Contact||normally closed, safety rated relay||Weight||6 lbs. (2.7 Kg)|
|Warning Output Load Rating||8A, 115/230 VAC||Environment||unaffected by dirt, grease, vibration, etc.|
|Warning Output Contact||normally open||temperature: 0° F – 130° F|
|C-UL, US Listed||humidity: 0 – 95% R. H.|
|Listings||Tested to UL 508 & CSA C22.2 No 14-95|