Interlock Switches Non contact Switches Ferrogard GS1 & GS2 Specifications Standards EN954-1, ISO13849-1, IEC/EN60204-1, NFPA79, EN1088, ISO14119, ANSI B11.19, AS4024.1 Category Cat. 1 Device per EN954-1 Dual channel interlocks suitable for Cat. 3 or 4 systems Approvals GS1 and GS2 CE marked for all applicable directives and cULus GS2 Ex EExd IIC T6 Baseefa Operating Distance – Make GS1 GS2 12mm (0.47in) 15mm (0.59in) Description The Ferrogard range of magnetically actuated safety switches offers Non contact reliability together with tolerance to misalignment. They are designed to be installed so that when a guard door is opened, the action of the magnetic actuator being removed from the switch opens the N.C. safety contacts which are intended for the isolation of control power to a machine primary control element. The GS1 and GS2 are designed for heavy duty applications. The GS1 is housed in a stainless steel or brass housing. The GS2 offers the same characteristic as the GS1, but in an Ex housing for hazardous locations. Unlike some magnetic switches the Ferrogards have protected safety contacts to help ensure that they do not fail to danger. All Ferrogards have internal non-resettable overload protection on the safety contact. They should be protected by an external fuse rated as shown in the specifications table. See the Explosion Proof section on page 16-1 for more information on the EX version of the Ferrogard GS2. Operating Distance – Break GS1 GS2 23mm (0.91in) 26mm (1.02in) Closing Time 3.0ms Dropout Time 2.1ms Bounce Time 0.7ms Initial Contact Resistance 15mW Initial Capacitance, Terminal to Terminal 0.65pF Initial Insulation Resistance, Terminal to Terminal 1 x 106 Ω Safety Contact Switching Capability 250V AC 2A max Safety Contact External Fusing < 1.6A quick blow Min Initial Breakdown Voltage 600V AC Operating Temperature -25°C to +125°C (-13° to +257°F) Enclosure Protection IP68 (NEMA 6P) Cable GS1 Brass 0.75 mm2 (18AWG) 2 wire Grey PVC Jacket OD 6mm (0.24in) Stainless Steel 0.75 mm2 (18AWG) 2 wire Jacket OD 7mm (0.28in) GS2 White PVC 1.34 mm2 (16AWG) 2 wire Braided Polyolefin Jacket OD 8.4.mm (0.32in) Features • • • • • Non contact actuation High tolerance to misalignment High switching current (2A AC) Metal housings (IP 68) Ex version available Case Material Stainless Steel or Brass Mounting Any Position M3 mounting security screws included. Weight (not including cable) GS1 Brass GS1 Steel 381g (0.84lbs) Actuator 388g (0.86lbs) 116g (0.26lbs) 3-52 Electrical Life 1 X 106 at rated load Mechanical Life 10 X 106 Vibration 15g, 20 to 1000Hz Shock 50g Ex Version See Explosion Proof Section Interlock Switches Non contact Switches Ferrogard GS1 & GS2 Product Selection Safety Contact Switching Capability Auxiliary Contacts Safety Contacts Connection Housing Catalogue Number Type Brass 2m Cable 250V AC, 2A 1 N.C. 440N-G02048 GS 1 Stainless Steel None Brass 3m Cable 440N-G02049 440N-H02046 GS 2 Ex Stainless Steel 440N-H02047 Note: Contacts are described with the guard door closed, that is, actuator in place. Switch is shipped complete with Actuator. Accessories Description Used with Page Number Catalogue Number Actuator, Alnico Brass Switch — 440N-A02056 Actuator, Epoxy-painted Stainless Steel — 440N-A02057 Approximate Dimensions—mm (inches) Dimensions are not intended to be used for installation purposes. GS1 Switch GS1 & GS2 Actuator GS2 Switch 19 (0.75) 13 (0.51) 60 (2.36) 25 (0.98) 16 (0.63) 127 (5) 17 (0.67) 30 (1.18) 6.5 19 (0.26)(0.75) 67 (2.64) 33.5 (1.32) 114.5 (4.51) 46 (1.81) 54 (2.13) 11 (0.43) 6.5 22 (0.87) (0.26) 54 (2.13) 12 (0.47) 7 (0.28) 20 (0.79) Typical Wiring Diagrams QD Cable Brown Blue Safety N.C. Fuse Externally Safety N.C. Fuse Externally Note: Unit must be to a grounded to a grounded metal frame or grounded via the field wiring per NEC requirements. Application Details See page 3-54 for operating principles and mounting examples. 3-53 Interlock Switches Non contact Switches Ferrogard Applications Application Details Operating Principle Encapsulated in the Ferrogard is a unique high power industrial reed, capable of switching up to 15A. The need switch is de-rated by a non resettable overload protection fuse. On presenting the actuator to the switch, the high intensity magnetic field from the actuator causes the contacts to close. On removing the actuator (opening the door), the safety contacts open. Mounting Example 1 Door Closed, Machine RUN Door Opened, Machine STOP, Door Covering Switch 2mm No access to switch thus preventing attempts to defeat the interlock. Sliding Door Sliding Door Note: Whenever possible, the units should be mounted so that no access can be obtained to the switch when the guard door is open, thus preventing attempts to defeat the safety system. Mounting Example 2 Min 50mm 2mm ✔ ✘ Switch Switch Actuator Actuator Door 1 Door 2 It is advisable, where possible, to mount the switch and actuator on nonferrous materials otherwise it may effect the operating distances. If mounting on ferrous material, use of a 5mm plastic spacer is recommended. 3-54 Interlock Switches Non contact Switches Ferrogard Applications Application Details Note: Under the requirements of the Machinery Directive all machinery must undergo risk assessment to determine the necessary level (or category) of the safety related control system or hazard avoidance measures. While the Ferrogard complies with the requirements of EN1088 it may not be suitable for all types of machinery or environments. Where magnetic materials are present or if it is foreseeable that through machine function or use. Ferrogard operation by magnates other than the supplied actuator is possible, then use of an alternative Allen-Bradley Guardmaster switch is recommended. Other Non contact options include: Ferrocode (which utilizes additional coding techniques preventing them from being overridden by simple means). Alternatively additional measures may be taken to prevent the Ferrogard being easily bypassed. Consideration should be given to the recommended installation example given in the instructions and those in EN1088. ✔ ✔ ✘ Typical Applications Sliding Guard Removable Guard Hinged Guard Note: Removable guards using Non contact switches may require two switches, one at either side of the guard, or the use of a flap to prevent initial lifting of the non-interlocked edge. 3-55