Bender SB473-34

The relays of the SB47x series monitor the secondary circuits of welding transformers forfault voltages. A total of six secondary circuits can be monitored. The versions SB473 and5B476 can be linked for common alarm messages.

Voltage monitoring of 1, 3 or 6 secondarycircuits of welding transformers

One common alarm from several5B47x devices

Alarm LEDs for fault voltage per channel,PE/KE interruption interruption of themeasuring line

Connection monitoring of measuringline and earth connection

Fault memory

RESET button

1 potentialfree changeover contact(SB476)

2 potentialfree changeover contacts(SB471,5B473)

Modular DlN rail enclosure

Both measuring connections (2.8. E1/E2) are connected to different points on the samesecondary circuit. Also the two earth connecting terminals are connected to the PE conductor(PE) at different points. lf the measured fault voltage value exceeds the response value,the alarm LED of the respective measuring circuit lights up and the alarm relay switches.The alarm relay works in N/C operation so that in the event of supply voltage failure amessage is ensured.

When the fault (touch voltage) has been eliminated, the alarm relay switches back to itsoriginal state and the alarm LED goes out after pressing the reset button.To ensure a safe condition, the connecting leads to the welding circuits being monitoredand the connecting leads to earth are continuously monitored. ifone or several measurementor earth connections are interrupted, the alarm relay switches.In addition, the alarm LED ON (interruption earth connection) and/or-the alarm LED ofthe respective channel flashes.

The device function can be tested by pressing the test button.If the $B476 is used in combination with SB473, the $B473 will output a common alarmfor all of the three welding circuits as well as for all connected $B476.The cable length

must not exceed 50 m.

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