Dold Industries Ltd

11 Hamberts Rd. Blackall Ind. Estate
South Woodham Ferrers
GB-Essex, CM3 5UW
MH 9837/5_0

Frequency Relay

MH 9837/5_0

Contacts

Auxiliary voltage

Response value

Hysteresis

Variant

  • 0064817
  • MH9837.38/500 2x1.5-200HZ Tv=0
Monitoring of frequency in AC systems Monitoring of rotor frequency on slip ring motors... more

Product description

  • Monitoring of frequency in AC systems
  • Monitoring of rotor frequency on slip ring motors
  • Control and monitoring of motors in sewage water treatment plants
  • Monitoring of output frequency on inverters (variant /550)

Technical specifications

Enclosure design: Switch cabinet
Width: 45 mm
1- / 3-phase: 1
Auxiliary voltage required: +
Output contacts: 2 x 2 Wechsler
Measuring range max.: 600 Hz
Standard measuring range: 1,5 ... 600 Hz
Type: MH 9837/5_0

Advantages

  • Separate output signals for under and over frequency
  • Simple wiring
  • Easy handling

Features

  • According to IEC/EN 60255-1
  • Monitoring of AC voltage for under and overfrequency, can be used also for pre-warning
    (monitoring of AC voltage for under or overfrequency see datasheet MK 9837N)
  • Separate relay outputs for over- or underfrequency
    (1 or 2 changeover contacts each)
  • Alternative usage for monitoring of a frequency window
  • Separate adjustment of response value for over- or underfrequency
    at 4 ranges each, 1.5 ... 200 Hz or 5 ... 600 Hz
  • Second response value for prewarning possible
  • Fast reaction time by measuring duration of cycle of input frequency
  • Universal measuring input for AC-voltages of 15 ... 280 V as well as 30 ... 550 V
  • As option with measuring input for inverters
  • Programmable hysteresis of response value: 2 ... 10 %
  • Start up time delay programmable via terminals from 0 ... 50 s e.g. continuously
  • Manual or auto-reset programmable via terminals
  • Galvanic separation between measuring input, auxiliary voltage and output contacts
  • MH 9837/508: with galvanic separated analogue output (current/ voltage) and 11 step LED chain for the actual frequency
  • MH 9837/5_0: with wide input range for auxiliary voltage available
    (AC/DC 24 ... 60 V or AC/DC 110 ... 230 V)
  • Closed circuit operation (de-energized on trip)
  • LED indication for auxiliary voltage, measuring voltage and alarm status
  • Device available with 2 contacts
    MK 9837N/5_0: 2 x 1 changeover contact
    MH 9837/5_0: 2 x 2 changeover contacts or wide auxiliary voltage range
  • 2 possible compact designs:
    MK 9837N/5_0: Width 22,5 mm
    MH 9837/5_0: Width 45 mm