It can drive loads such. Earth fault detection can be provided by connecting an MTL earth leakage detector to terminal 6. MTLA Current repeater. MTLB Repeater power supply. MTLP High-power repeater power supply. MTLT Repeater power supply. MTL Repeater power supply. MTLD Repeater power supply. MTL Loop powered isolator.
MTL Switch operated relay. MTL Temperature converter. MTL Voltage isolator. MTL Vibration transducer interface. MTL Pulse isolator. MTL Fire and smoke detector interface. There is a small field current that is used by the module to determine the line condition and some low-power solenoids are capable of remaining in their energised state, once energised, with very small loop currents.
If the safe state of the loop is for the solenoid to be OFF then it must be able to drop out, despite the monitoring of line state. It is important that the effect of electromagnetic interference on the operation of any safety function is reduced where possible.
For this reason it is recommended that the cable connections from the logic solver to the isolator modules be a maximum of 30 metres and are not exposed to possible induced surges, keeping them inside a protected environment.
When the safety function is to energise the output then a SIL1 rating can be determined. In many countries there are specific codes of practice, together with industry guidelines, which must also be adhered to. Provided that these installation requirements are followed then there are no additional factors to meet the needs of applying the products for functional safety use.
To guard against the effects of dust and water the modules should be mounted in an enclosure providing at least IP54 protection degree, or the location of mounting should provide equivalent protection such as inside an equipment cabinet.
In applications using MTL Series, where the environment has a high humidity, the mounting backplanes should be specified to include conformal coating. In addition, proof-testing of the loop operation to conform with functional safety requirements should be carried out at the intervals determined by safety case assessment. Proof testing must be carried out according to the application requirements, but it is recommended that this be carried out at least once every three years.
When appropriate, a Customer Incident Report CIR will be notified to enable the return of the unit to the factory for analysis.
If the unit is within the warranty period then a replacement unit will be sent. Consideration should be made of the normal lifetime for a device of this type which would be in the region of ten years.
MTL 2 channel proximity sensor or switch input and relay outputs. MTL proximity sensor or switch input with relay output and line fault detect. MTL proximity sensor or switch input with solid state output.
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