Mains Frequency Monitor
MH 9143

The MK 9143N and MH 9143 mains frequency monitors of the VARIMETER series 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: 45mm
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 2 C/O contacts
Auxiliary voltage required: Yes
Type: MH 9143


Manufacturer: E. Dold & Söhne GmbH & Co. KG
Type: MH9143.38 +/-5Hz UH AC/DC110-230V
Art. No.: 0060945