Basler BE1-47N Relay Field Setting and Testing Guide

Auxiliary power supply:

The power supply types include DC (such as 24 Vdc, 48 Vdc, 125 Vdc, 250 Vdc) and AC (such as 120 Vac, 240 Vac). The power terminals have no polarity requirements, but it is necessary to ensure that the voltage is within the allowable range. When the power is normal, the red LED indicator on the panel lights up.

Output contact:

The main output contact is used for tripping circuits and can be selected as normally open or normally closed. The auxiliary output contact can be used for signal remote transmission or alarm. If a current type target indicator is selected, it is necessary to ensure that the tripping circuit current is not less than 200 mA, otherwise the target indicator may not function properly.

Suggestions for wiring construction:

Unless otherwise specified, the wire diameter should not be less than 14 AWG;

If the output contact is used to drive the external relay coil, it is recommended to parallel reverse diodes at both ends of the coil to suppress EMI interference generated during power failure;

If insulation withstand voltage testing is required, it is necessary to first unplug the connection plug and extract the relay from the chassis to avoid damaging the internal circuit.

Panel controls and operating instructions

The layout of the BE1-47N panel is clear, with operation controls concentrated on the front for easy on-site tuning and status viewing.

The main controls include:

Negative sequence voltage setting dip switch: 16 positions, corresponding to negative sequence voltage setting values of 2% to 32%, with an interval of 2% between each position. The panel is accompanied by a comparison table, indicating the percentage values corresponding to grades A to S.

Undervoltage setting dip switch (optional): The setting range is 2% to 32% below the rated voltage.

Overvoltage setting toggle switch (optional): The setting range is 2% to 32% higher than the rated voltage.

Delay setting dip switch: For timed characteristics, it can be set from 0.1 seconds to 9.9 seconds with a step size of 0.1 seconds; For the inverse time characteristic, the range is set from 01 to 99.

Target reset button: used to manually reset the target indicator that has been activated.

Output test hole: A non-conductive rod can be inserted into the panel hole to manually trigger the output relay for circuit inspection.

Status indication:

Power indicator light: green or red LED, lit up to indicate that the auxiliary power supply is normal.

Pick up indicator lights for negative sequence, undervoltage, and overvoltage protection units: red LED, which lights up when the corresponding power exceeds the set value, indicating a delayed or instantaneous action state.

Target indicator: Electronic locking type red LED, which remains lit when the output relay is activated until manually reset.

Parameter tuning methods and principles

Reasonable setting is a prerequisite for relays to perform protective functions. The following are the principles for setting various protections.

Negative sequence voltage setting:

The negative sequence voltage in normal industrial power supply is usually between 1% and 2%. It is recommended to set the initial setting value to 4%~6% to avoid frequent misoperation caused by normal system imbalance.

If the motor load is heavy, the setting value can be appropriately increased, but should not exceed 10%, otherwise it may not effectively protect the equipment from the impact of phase loss faults.

Undervoltage setting:

Usually set at 80% to 90% of the rated voltage, used to detect significant drops in the supply voltage.

It needs to match the minimum operating voltage allowed by the system to avoid misoperation during brief voltage drops such as motor start-up.

Overvoltage setting:

Generally set to 110%~120% of the rated voltage, used to prevent excessive voltage caused by capacitor bank switching or system faults.

Delay characteristic selection:

Fixed time limit: Suitable for situations with clear requirements for time limits, such as cooperating with subordinate protection.

Inverse time limit: applicable to equipment such as motors or transformers, whose ability to withstand asymmetric voltage rapidly decreases with the increase of negative sequence voltage.

Instantaneous (delay set to 00): Used for severe faults that require immediate action, with an action time of less than 50 milliseconds.

On site testing and functional verification

To ensure reliable operation of the relay after it is put into operation, it is recommended to conduct basic functional tests under on-site conditions. The following testing methods are all from official technical manuals and are suitable for on-site implementation.

7.1 Negative sequence voltage pickup and return value test (single-phase method)

Due to the laboratory level symmetrical component testing requiring three-phase voltage sources and phase measurements, a simplified single-phase method can be used on site:

Set the negative sequence setting switch to K position (corresponding to 20%);

Short circuit the terminals of phases B and C (simulate Vbc=0);

Apply a single-phase voltage between phases A and B/C at the rated frequency;