Safety Monitoring Relays Provide an Economical Solution to Control Reliability
Safety relays are designed to provide a convenient and economical solution for incorporating control reliability into a safety circuit. Power to the machine primary control elements (MPCE) is connected through the safety output contacts of the safety monitoring relay. Inputs to the monitoring relay are typically from safety devices such as emergency stop switches, limit switches, or safety interlock switches. The safety monitoring relay’s own output safety contacts are monitored internally. If a fault occurs in the operation of one of the monitoring relay contacts, the safety relay shuts down, removes power from the MPCE and prevents a start or successive cycle of the machine until the fault is cleared. In addition, the contacts of the MCPE or external safety relay can be monitored by the safety monitoring relay. The American industry standard ANSI B11.19-2003 is mandatory for all safety systems used for machine guarding. Exchange Links
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