Phase sequence switching for 3-phase applications

Description

According to DIN EN60204-1 Section 7.8, a phase sequence monitoring must be provided wherever a wrong phase sequence of the supply voltage can cause a hazardous condition or damage to the machine.

Particulars

Optimal protection against starting in the wrong rotation direction
Starting lock in case of a missing phase in the network
Effective protection for both personnel and machine
Cost-effective as it is supplied completely

Operating conditions that can lead to a wrong phase sequence include:

A machine is switched from one power supply to another
A mobile machine with the possibility of connection to an external power supply

Series Specifications

Function

Direction of rotation and phase failure detection

Output signal

Potential-free contact for the corresponding output K-left and K-right.

Response time

approximately 200 ms

Switching power

1920 VA

Switching voltage

250 V AC

Test voltage open contact

1000 V AC

Test voltage contact - coil

5000 V AC

Switching current

8A 250V~

Mechanical lifespan

5x10⁶ switching cycles

Contact type

1x normally closed contact (LNO)

Contact assignment

COM-RNO = relay for right rotation field; COM-LNO = relay for left rotation field

Self-consumption

approximately 2.7 W

Dimensions (LxWxH)

75 x 55 x 25 mm

Function description

Direction locks are used in machines where starting in the wrong rotational direction poses a risk to the drive, the product being produced, or the operating personnel. Such drives can include, for example, conveyor belts in production facilities, mixing devices for mortar and similar materials, or gearbox units.

The control board for rotating field switching checks the incoming rotating field from the power supply and switches the corresponding output relay for the respective output contactor, ensuring that the desired rotating field is always present at the output.

Versions

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