Diesel engine protection system AHD 514 S

propulsion diesel control system

Product Features

  • Profile module for installation on standard profile rails in consoles, control panels or control cabinets
  • Degree of protection IP 20
  • 2 separated 24 V DC power supplies for emergency stop circuit and safety system
  • Emergency stop function independent from safety function
  • Separate processing of emergency stop inputs and stop criteria
  • An initiated emergency stop is routed directly to the emergency stop output
  • Acquisition of safety relevant (redundant) sensors independent from alarm system AHD 514 A
  • 2 independent binary emergency stop inputs, wire-breakage monitored
  • 5 binary inputs, wire-breakage monitored, for stop criteria
  • 5 binary inputs for control functions (alarm acknowledgement, reset, overspeed test, override, etc.)
  • 1 speed input, galvanically isolated
  • 4 relay outputs, 6 A, potential free, for alarm and failure outputs
  • 2 transistor outputs, 8 A, wire-breakage monitored and short circuit-proof, for engine stop via solenoid/operating magnet, air flaps from safety system
  • 1 transistor output, 8 A, wire-breakage monitored and short circuit-proof, for engine stop from emergency stop system
  • 1 analog output (4 – 20 mA) for external speed indication
  • Power supply 2 x 24 V DC +30%/-25% for safety system and emergency stop system
  • 1 CAN-bus interface for data communication with AHD 514 A start/stop alarm system
  • 1 serial output (optocoupler)
  • Connections via pluggable terminal lists
  • Type approved by ABS, BV, CRS, DNV/GL, LR



AHD 514 S is a microprocessor-controlled device comprising all safety functions, predetermined by classification societies, for monitoring systems for propulsion diesel engines with individual adaption to type series of different engine manufacturers.

Drawings and photos AHD 514-S

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