Mains Frequency Monitor
MK 9143N

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.

Advantages
. Monitoring of 50 - and 60 Hz-current supply on over- and underfrequency
. For precise frequency measuring with fast response time
. High disturbance immunity
. Separately adjustable trip points and separate outputs for overand underfrequency (1 or 2 c/o each)

Features
. 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

Technical specifications
Width: 22,5mm
Operate delay: Yes
Enclosure design: Switch cabinet
1- / 3-phase: 1
Standard measuring range: 50/60 Hz
Measuring range max.: 50/60 Hz
Output contacts: 2 x 1 C/O contacts
Auxiliary voltage required: Yes
Type: MK 9143N


Manufacturer: E. Dold & Söhne GmbH & Co. KG
Type: MK9143N.38 +/-5Hz  UH AC230V
Art. No.: 0060936