Frequency Relay
MK 9837N/5_0

The frequency relays MK 9837N/5_0 e.g. MH 9837/5_0 are used for frequency monitoring of AC voltages. They are used for monitoring the output frequenc of frequency converters (/550) or for monitoring the rotor frequency of slip ring motors. Further area of application ist the monitoring of drives in crane systems.

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

Technical specifications
Width: 22,5mm
Enclosure design: Switch cabinet
1- / 3-phase: 1
Standard measuring range: 1,5 - 600 Hz
Measuring range max.: 600 Hz
Output contacts: 2 x 1 C/O contacts
Auxiliary voltage required: Yes
Type: MK 9837N/5_0


Manufacturer: E. Dold & Söhne GmbH & Co. KG
Type: MK9837N.38/500 2x5-600HZ UH=AC230V
Art. No.: 0061295