Guard Safety Systems
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These devices comprise two separate elements. A switch body and an actuator tongue. When the tongue enters the switch body it engages a mechanism which closes or opens internal electrical contacts.The mechanism is designed to prevent easy bypassing or “cheating” of the switch. The switch and actuator require reasonably accurate alignment and
should not be subjected to constant high-amplitude vibration. Given that
these conditions are fulfiled, tongue-operated interlock switches provide
highly reliable operation with a good choice of contact configurations and
ratings. |
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These devices have an actuating shaft which is connected to the hinge point of guards and flaps. Turning of the actuating shaft closes or opens internal electrical contacts.Various lengths and types of actuator shaft are available. The hinge configuration must be suitable for connection to the actuator shaft.The degree of hinge rotation required to open the internal contacts should not allow a large gap at the opening edge of large guards. Given that these conditions are fulfiled, these
devices provide a direct and reliable method of interlocking hinged guards. |
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With these devices the same process that actuates the internal contacts also locks the guard door closed.The guard door cannot be unlocked until the hazardous motion has been stopped. It may also be conditional on time and movement sensing. Unlocking and opening the guard door also de-actuates the contacts. Guard locking switches can be used for applications where the dangerous motion takes time to run down after the electrical power has been stopped.They can also prevent machine damage and programmable control problems caused by unintended stopping in mid-cycle. . |
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These devices are available with a range of plunges and lever actuator heads which are directly connected the internal contacts. When the sliding action of a guard depresses the head the contacts are positively actuated. It is important that the guard cannot pass completely over the switch and allow the plunger or lever to return to its original position.The correct type of switch must be combined with a suitably designed installation. |
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With these devices there is no physical contact between the separate switch and actuator units. Both units are sealed with a high IP rating. They provide tolerance for misalignment and movement between the actuator and switch. These devices should be protected from impact damage. Some switches in the range provide very high protection against defeat and have monitoring control units. |
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Guardmaster has a range of Lifeline rope-operated and Protekta push-button emergency-stop trip devices which are installed to ensure that an operator can stop a machine in an emergency situation.The Protekta two-hand control unit has an integral emergency-stop button. |
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Control units provide functions such as time delays, motion sensing and two-hand control supervision.. The functional requirements for monitoring safety relay units such as the Guardmaster Minotaur range depend on their use in the system. The basic uses are: 1 – To detect faults on safety-related electrical control circuits,
e.g. faults in sensors, wiring, contactors, etc. 2 – To provide an ensured switching action., e.g. to act as an intermediate relay to amplify a signal or distribute it to multiple
devices 3 – To provide a manual reset facility They achieve their function by using internal redundancy (e.g. duplication) and monitoring. |
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specifications
laid down by both legal requirements and industrial necessity.The Zonegard
system combines soundengineering practice with a unique innovative construction
process to give maximum reliability and safety. The mat has been designed
from the "ground up" to meet the arduous conditions found on the
factory floor, and uses tried and trusted components
and techniques throughout. The mats are available in a wide range of standard
sizes to meet most requirements quickly and economically. Special sizes and
shapes can be supplied to meet the requirements
of any application. The mat has two conductive treated plates that
are held apart by non conductive compressible separators. Each 4 wire mat,
operating on only 24V DC is pre-wired, and connected in series with any other
mats forming a complete floor level guarding system for the hazardous areas.
The circuit through the mat is monitored by the Zonegard Control Unit, which,
when the area is clear provides a signal to the machine control circuit. |
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back
into shape even after repeated heavy crushing forces.The secret of the
Safedge's ability to out perform competition lies in i t s innovative design.
It uses a combination of non conductive rubber and flexible wire cored
conductive rubber bonded together to form a variety of perfectly flexible and
energy absorbing profiles.The Safedge has no rigid internal parts which can
"break through" or cause fatigue failures after prolonged use.
The copper wire core throughout the length of the strip (up to 50m) ensures that
there are no problems of resistance build up on long lengths. A Control unit
is available with two channel failsafe electronics with 100% redundancy and
will give guaranteed isolation of machine power if anything presses on the
profile. It will also initiate power isolation in the event of component or
power supply failure, or if the profile or connecting wire is severed. The
Safedge profile slides into a "C" rail which is fixed to equipment
to be guarded. A range of accessories is available for end termination and
corner joints with a choice of eight different sensing profiles. |
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Built in shear point Power interlocking Interlocks on machine guarding Oil, gas and process industries Safety of the environment High and low voltage electrical equipment OSHA regulations and EN 1037 |
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For
more information please send as your request by fax or e-mail |
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