Dold Industries Ltd

11 Hamberts Rd. Blackall Ind. Estate
South Woodham Ferrers
GB-Essex, CM3 5UW
AA 9837

Frequency Relay

AA 9837

Contacts

Auxiliary voltage

Measuring range

Variant

  • 0005663
  • AA9837.12/010 30-90HZ UH AC230V
The frequency relay can be used especially in applications where the rotor frequency of a... more

Product description

The frequency relay can be used especially in applications where the rotor frequency of a slip-ring motor must be measured. The rotor frequency is reciprocal proportional to the speed (see diagram rotor frequency at contercurrent braking). This behaviour allows to find speed depending switching values and can be used for start up and contercurrent braking of motors on cranes.

Technical specifications

Measuring range max.: 600 Hz
Standard measuring range: 30 - 90 Hz
1- / 3-phase: 1
Operate delay: Yes
Output contacts: 1 C/O contact, 2 C/O contacts
Width: 45 mm
Enclosure design: Switch cabinet
Auxiliary voltage required: Yes
Type: AA 9837

Features

  • According IEC/EN 60255, DIN VDE 0435-303
  • Detection of under- or overfrequency
  • Adjustable response value
  • Optionally 1 or 2 changeover contacts
  • Width 45 mm