Basler BE1-47N Relay Field Setting and Testing Guide

Calculate according to the formula:

V_AB = V2PU × √3 × VN

VN is the rated phase voltage (such as 120 Vac), and V2PU is the set value (such as 0.2 pu).

For a 120 Vac system, the calculated value is approximately 41.57 Vac. At this time, the negative sequence picking LED should light up.

Slowly decrease the voltage and observe the voltage value when the LED is turned off. The return value should be around 98% of the picked up value, which is approximately 40.7 Vac.

This method can quickly verify whether the negative sequence detection circuit is normal and confirm the accuracy of the setting switch.

7.2 Overvoltage and undervoltage pickup test

Overvoltage test:

Set the overvoltage setting switch to E position (10%);

Apply 1.10 times the rated voltage (such as 132 Vac) between phases B and C;

The overvoltage pickup LED should light up;

Reduce the voltage until the LED goes out, and the return value should be around 98% of the pickup value.

Undervoltage test:

Set the undervoltage setting switch to E position (10%);

Apply 0.90 times the rated voltage (such as 108 Vac) between phases B and C;

The undervoltage pickup LED should light up;

Raise the voltage until the LED turns off, and the return value should be around 102% of the pickup value.

7.3 Fixed time and inverse time delay verification

Time limited verification (taking overvoltage as an example):

Set the delay switch to 33 (i.e. 3.3 seconds);

Set the overvoltage setting to A level (2%);

Apply 1.20 times the rated voltage and start the timer at the same time;

The output contact should close within 3.3 seconds ± 5%.

Inverse time limit verification (taking negative sequence as an example):

Set the negative sequence to B level (4%) and set the delay to 10;

Short circuit phases B and C;

Apply a voltage twice the value of the pickup (refer to the table in the manual);

The measurement of the time from voltage application to contact closure should be consistent with the corresponding value of the inverse time curve provided in the manual (such as 5.96 seconds ± 0.298 seconds).

Maintenance and Storage Suggestions

BE1-47N is a solid-state relay with less daily maintenance workload. It is recommended to conduct a functional test on a regular basis (such as annually) to confirm that all protection parameters and action times meet the requirements. If the relay is stored for a long time as a backup, it should be powered on for 30 minutes every 12 months to maintain the performance of the internal electrolytic capacitor and extend its service life.

If there is an abnormality in the relay, it is not recommended to disassemble and repair it on site. It is necessary to promptly contact Basler Electric technical support for professional repair services.