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Kempston Controls is pleased to announce a classic British brand will return to UK ownership with our acquisition of MEM (Midland Electrical Manufacturing). The deal, completed on the 1st December 2021 includes Eaton’s MEM MEMSHIELD 1 & 2 and Cranes range. The aim is to continue MEM’s history of innovation by developing, manufacturing, and selling these dependable product ranges for years to come.
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- LH5946.48/61 24VDC
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Dold - LH5946.48/61 24VDC STANDSTILL MONITOR FOR ELECTRIC MOTORS, SAFEMASTER S, 3 AND SINGLE PHASE, BROKEN WIRE DETECTION, ADJUSTABLE
LH5946486124VDC / 0059266
Manufacturer: Dold
STANDSTILL MONITOR FOR ELECTRIC MOTORS, SAFEMASTER S, 3 AND SINGLE PHASE, BROKEN WIRE DETECTION, ADJUSTABLE
9 in stock
Order by 16:00 for same day UK despatch
Standstill Monitor for Electric Motors, Safemaster S, 3 and Single Phase
The Standstill monitor LH5946 is suitable to monitor the standstill of all electric motors that generate a remanence voltage while coasting to stop.
The LH 5946 is connected to the motor terminals and measures the induced back emf voltage. 2 redundant measuring channels are used (L2-L1 and L3 L1) and If the back emf voltage drops to 0 simultaneously in both channels this indicates standstill and the output relay is energised.
To adopt the unit to all different types of motors and applications the voltage threshold indicating standstill on LH 5946 is adjustable. In addition, the time delay between detection and energisation of the relay is adjustable (standstill time ts).
This capable standstill monitor detects broken wires on the measuring inputs L1 / L2 / L3. If a broken wire is detected the output relays goes into safe state, as with running motor. The input signals of both channels are permanently compared. If the signals are different for more than 2.5 seconds a simultaneity failure is detected. This failure resets when both input channels receive simultaneous signals with a level, above the voltage threshold and hysteresis.
The LH 5946 can be used for standstill detection on all 3-phase, single phase and DC motors, that generate a voltage caused by remanence when freewheeling. As the voltage level for standstill monitoring and the time delay, after detection of standstill until the safety relays are switched on, are adjustable, the function can be adopted to different motors and applications.
Applications include Safe standstill detection on 3- and single-phase motors, for example. to enable gate interlocks on machine tools or to activate hold in brakes.
Features according to performance Level (PL) e and category 4 to EN ISO 13849-1, SIL-Claimed Level (SIL CL) 3 to IEC/EN 62061, Safety Integrity Level (SIL) 3 to IEC/EN 61508, IEC/EN 61511 and EN 61800-5-2.
Standstill Motor Features
- Safe standstill detection on 3- and single-phase motors
- No external sensors necessary
- Independent of direction
- Broken wire detection
- Forcibly guided safety contacts: 3 NO contacts, 1 NC contact for AC 250 V
- 2 semiconductor monitoring outputs
- 1 monitoring output (NO contact)
- Adjustable voltage setting
- Adjustable standstill time delay
- LED indicators for standstill, event of line breakage and operation voltage
- Suitable for operation with inverters
- Width 45 mm
Datasheets and Manuals
Product Information
Alternative Part Number: | 0059266 |
Manufacturer: | Dold |
Pricing Unit: | Each |
Weight: | 0.444 kg (each) |
Tariff code: | 85364900 |
Generic code: | DOLD |
GTIN/UPC/EAN: | 4030641592660 |
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