D 11 Posts in this encyclopedia category
Continuous current
This is the current that a relay contact may carry continuously without exceeding the permissible temperature rise in relation to the defined ambient conditions.
DGUV Regulation 3
A prerequisite for the safe, fault-free operation of electrical systems and equipment is the permanent assurance of their proper condition. The types of tests and test intervals required for this...
Diagnostic Coverage (DC)
Diagnostic coverage represents the ratio of the failure rate of noticed dangerous failures and failure rate of total dangerous failures.
Differential current monitor
Differential current monitors, also called RCMs (residual current monitors), are used in earthed networks (TN networks). Here, residual current monitoring is carried out according to the principle...
DIN EN 61508
DIN EN 61508 considers the safety-related functions over the entire life cycle of a product / system from design to decommissioning (probabilistic aspects). It is a basic safety standard from...
DIN EN 62061
Functional safety of safety-related electrical, electronic and programmable electrical control systems. Application-specific sector standard for the mechanical engineering industry. The...
DIN EN ISO 13849
Safety of machinery - Safety-related parts of control systems Part 1: General design principles Part 2: Validation
Discrepancy monitoring
Tolerates the non-simultaneity of related signals through a defined time window. The term simultaneity monitoring is also used. Monitoring of signal transmitters is used to increase functional...
Speed monitoring
Safety-related monitoring of a defined speed. If this speed is exceeded or undershot, the drive is switched off or a message is sent.
Speed monitor
Speed monitors offer a convenient solution for safety-related speed monitoring, as used in wind turbines, centrifuges or stage technology. Standstill / overspeed and underspeed are reliably...