Machinery Protection Devices - British Automation & Robot ...

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EN 574 (Safety of machinery. Two-hand controls) defines 3 types oftwo-hand controls, setting out the minimum measures of safety foreach device, as shown in the table below:46142Machinery ProtectionDevicesRequirementsTypesI II IIIA B CUse of both hands (simultaneous actuation) X X X X XRelationship between input signals and output signal X X X X XCessation of the output signal X X X X XPrevention of accidental operation X X X X XPrevention of defeat X X X X XRe-initiation of the output signal X X X XSynchronous actuation X X XUse of category 1 (EN 954-1: 1996) X XUse of category 3 (EN 954-1: 1996) X XUse of category 4 (EN 954-1: 1996)XFig. 47: Minimum safety measures for two-hand devicesThe requirements are listed as follows:Operators shall use both hands during the same time period;this is simultaneous action and is independent of any timelag between the two input signalsThe two activating signals shall initiate and maintain theoutput as long as both signals are presentThe release of one or both activating signals will stop theoutputThe risk of accidental operation shall be minimisedPrevention of accidental operation or prevention of defeatshall be mainly achieved via mechanics and ergonomics
It shall only be possible to reinitiate the output signal afterboth inputs have been releasedThe output signal may only appear when both inputs areactivated within 0.5 seconds of each other. If the inputs arenot actuated synchronously, the output will be preventeduntil the inputs are re-applied within this time scale. This iscalled synchronous actuation.In the case of failure, the parts of the two-hand control device shallbehave in accordance with EN 954-1.5.4.1 Typical connectionInputsPLCOutput supplyInput supplyOutputs47143Machinery ProtectionDevicesY1Y2P2HZ X1EnablemachinemovementFig. 48: Typical two-hand circuit with Pilz P2HZ X1NB. Please refer to Pilz Safety Catalogue (1) for relay details.
Page 1 and 2: Chapter 5Machinery Protection Devic
Page 3 and 4: 5.0 GuardsA guard is defined as par
Page 5 and 6: 4This will be determined by the ris
Page 7 and 8: PNOZ X6PST 26Fig. 10: Two-channel c
Page 9: lock. Keys are uniquely coded and c
Page 15 and 16: FORTRESSINTERLOCKSFORTRESSINTERLOCK
Page 17 and 18: 16Fig. 18:With the AMLOK normally c
Page 19 and 20: Calculate the safety distanceThe sa
Page 21 and 22: The following table shows the formu
Page 23 and 24: 1256 mm minimumx = d < H / 15 + 50
Page 25 and 26: 5.2.4 Connection to control circuit
Page 27 and 28: 5.2.4.1 Typical connection+ 24 VDC1
Page 29: LCU-P outputin ON stateAOPD outputA
Page 32 and 33: 5.2.6 Pressure-sensitive safety dev
Page 34 and 35: 5.3.1 Emergency stop switchThe swit
Page 36 and 37: The next category of EN 954-1 makes
Page 38 and 39: Electromechanical and hydraulic cir
Page 40 and 41: E-StopY1Y2Y138134Machinery Protecti
Page 42 and 43: 5.3.4 Typical connectionsL1L2L34013
Page 44 and 45: L1L2L3F0Control CircuitFusesT1Contr
Page 46 and 47: E-StopPP24VMonitored dump valvesV1
Page 50: 5.4.2 Programmable electronic syste

Machinery Protection Devices - British Automation & Robot ...

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