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Rotational Direction Monitor with Phase Drop-out Detection for 3-phase Motors
Required standards:
Three-Phase monitoring is a mandatory requirement under DIN EN60204--1, Para. 7.8 "where a rotary field fault in the supply voltage could cause a hazardous condition or damage the machine."
Operational conditions which could cause a faulty rotational field include:
- switching a machine from one supply to another
- a portable machine with external connections for its energy supply
Rotational direction monitor as control board version
Rotational direction monitor in top-hat rail case
Special features:
- Optimal protection against startup in the wrong direction
- Protects the motor against a missing phase leg in line supply
- More effective protection for man and machine
- Economical complete package
Technical data:
- Designation
Control board version - 870 060 00 = 400 V~
870 061 00 = 230 V~ - Designation
Top-hat rail version - 850 345 80 = 400 V~
850 345 81 = 230 V~ - Input voltage
- 230 V or 400 V 50 Hz
- Function
- Detection of rotational direction and optional phase drop out
- Output signal
- Potential-free changeover contact NC-COM-NO
- Response time
- Approx. 200 ms
- Switching capacity
- 1920 VA
- Switching voltage
- 250 V AC
- Test voltage open contact
- 1000 V AC
- Test voltage contact coil
- 5000 V AC
- Switching current
- 8 A 250 V~
- Mechanical service life
- 5x106 switching cycles
- Contact type
- Changeover contact (NC-COM-NO)
- Contact assignments
- COM-NC break contact = fault
COM-NO make contact = good - Indicator control board
- Connection for LED indicating operational status "good"
- Indicator Top-hat rail version
- Green LED = Good
Red LED = Error - Control board dimensions
- 75 x 55 x 22 mm (LxWxH)
- Top-hat rail dimnesions
- 45.5 x 74 x 85 mm (LxWxH)
Use in Series
Circuit diagram [pdf-File]
Functional description:
Rotary direction lock-outs are used on machines where startup in the wrong direction would present a hazard for the drive mechanism, production materials or operating personnel. Examples of such motorized equipment are production conveyors, mixers for mortar or similar materials and transmission units. To protect such equipment from starting up in the wrong direction, this optional lock-out circuitry is available for the K900 and K3000 3Ph series of switches and top-hat rail cases and custom housings. The control board will detect the correct rotational direction of applied line voltages as well as the presence of all phase legs. When phase arrangement is correct, an output relay will activate. The voltage release signal in the control circuitry is enabled by this output relay and, in turn, enables the ON/OFF switch. If there is a fault in the rotary field, the motor cannot be turned on. A phase drop-out during operation will not be detected. If desired, the switch can also be equipped with an optional indicator, either optical or acoustic.