Banner SC26-2 Instruction Manual

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Banner SC26-2 Instruction Manual Manual pdf 82 page image

6.4.12 Adjustable Valve Monitoring (AVM) FunctionThe Adjustable Valve (Device) Monitoring (AVM) function is similar in function to One-Channel External DeviceMonitoring (1-channel EDM, see External Device Monitoring (EDM) on page 90). The AVM function monitors the state ofthe device(s) that are controlled by the safety output to which the function is mapped. When the safety output turns Off,the AVM input must be high/On (+24 V dc applied) before the AVM timer expires or a lockout will occur. The AVM inputmust also be high/On when the safety output attempts to turn On or a lockout will occur.Adjustable Valve Monitoring AVM is a way to check the operation of dual channel valves. The forceguided N.C. monitoring contacts of the valves are used as an input to detect a “stuck on” faultcondition and will prevent the safety controller outputs from turning On.Adjustable ValveMonitoring100 msto5 sec.100 msto5 sec.Don’t Care Don’t CareClosedOpenSO1AVMFigure 60. Timing logic—AVM FunctionNote: 100 ms to 5 s time period is adjustable in 50 ms intervals (default is 100 ms).The Adjustable Valve (Device) Monitoring function is useful for dynamically monitoring devices under the control of thesafety output that may become slow, stick, or fail in an energized state or position, and whose operation needs to beverified after a Stop signal occurs. Example applications include single- or dual-solenoid valves controlling clutch/brakemechanisms, and position sensors that monitor the home position of a linear actuator.Synchronization or checking a maximum differential timing between two or more devices, such as dual valves, may beachieved by mapping multiple AVM functions to one safety output and configuring the AVM timer to the same values. Anynumber of AVM inputs can be mapped to one safety output. An input signal can be generated by a hard/relay contact or asolid-state PNP output.XS/SC26-2 Safety Controller82