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Hirotronix supplies industrial automation sensors, machine safety systems, operator controls, level measurement systems, and automation components.

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DOLD MH 9143 – Mains Frequency Monitor

Brand

DOLD

Part number

MH 9143

Order number

0060945

Mains Frequency Monitor

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)

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Brand	DOLD
Housing width	45 mm
Output contacts	2 x 2 C/O contacts
Enclosure design	Switch cabinet
Phases	1
Order number	0060945

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.

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 arrangementsMK 9143N and MK 9143N/600: 2 x 1 C/O contacts, width 22,5 mmMH 9143 and MH 9143/600: 2 x 2 C/O contacts, width 45 mm

Technical specifications

1- / 3-phase	1
Auxiliary voltage required	Yes
Enclosure design	Switch cabinet
Measuring range max.	50/60 Hz
Operate delay	Yes
Output contacts	2 x 2 C/O contacts
Standard measuring range	50/60 Hz
Width	45 mm
Type	MH 9143

Available variants

Alarm delay	0 – 20 s · without
Auxiliary voltage	AC/DC 110 – 230 V · AC 115 V · AC 230 V · AC 400 V · DC 24 V
Contact equipping	2 x 1 changeover contact · 2 x 2 changeover contacts
Response value	+ / – [0.1 – 5] Hz · 45 – 65 Hz
Start up delay	0 – 30 s
Variant	Adjustable tripping values via 10-step switch. Adjustable time delay. Start up delay activatable via terminals · Variable tripping values. Adjustable hysteresis. Start up delay activatable via terminals