Dold MK9143N.38/600 45-65Hz UH AC230V, Mains Frequency Monitor, sku: 0060941

The MK 9143N and MH 9143 mains frequency monitors are used to monitor the frequency of 50 and 60 Hz power supplies for over- and underfrequency. They are used for monitoring self-generating systems and local power supplies, as well as for monitoring generators, power units, etc.

• According to IEC / EN 60255-1
• Monitoring of local generator sets and voltage supplies
• MK 9143N / MH 9143:
  - Trip points adjustable precisely and reproducible on 10 step rotational switch in the range of ± 0,1 Hz to ± 5 Hz related to 50 or 60 Hz
  - Nominal frequency 50 or 60 Hz selectable
  - Fixed hysteresis optimised for trip point
  - Time delay for over and underfrequency each adjustable from 0 to 20 s
  - As option one common output for under and overfrequency
  - “Window”-mode (MK 9143N/400 / MH 9143/400)
• MH 9143.38/008: With galvanic separated analogue output (current voltage) and 11 step LED chain for the actual frequency
• MK 9143N/600 / MH 9143/600:
  - Variable alarm value in the range of 45 to 65 Hz
  - Hysteresis adjustable for under- and overfrequency separately adjustable 0 … 20 %
  - Common output for under and overfrequency “Window”-mode can be selected
• Start up delay 0 … 30 s selectable
• Manual or auto reset selectable
• Output relay energized or de-energized on trip selectable for overfrequency
• Output relay de-energized on trip for underfrequency
• Universal frequency measuring input for AC 40 … 550 V
• Several options for auxiliary supply
• As option without aux. supply for voltage range AC 18 … 70 V or 70 … 275 V
• LED indicators for auxiliary supply, input frequency, over and under frequency alarm
• 2 possible contact arrangements
  MK 9143N and MK 9143N/600: 2 x 1 C/O contacts, width 22,5 mm
  MH 9143 and MH 9143/600: 2 x 2 C/O contacts, width 45 mm