Basler BE1-81O/U Frequency Relay: On site Debugging and Protection Configuration Guide

X1/X10/X100 magnification: By combining S7-1 and S7-2 (up/down toggle), the dial value on the front panel can be multiplied by 1, 10, or 100.

Cycle/second mode: selected through S7-3. Place 'Up' as cycles and 'Down' as seconds.

Typical application examples:

If a 5-second delay is required: set S7-1=Down, S7-2=Down (x1), S7-3=Down (seconds), and set the front panel dial to "05".

If you need to set a 250 cycle delay: set S7-1=Up, S7-2=Up (x100), S7-3=Up (cycle), set the front panel dial to "02" (i.e. 2 x 100=200 cycles, equal to 4 seconds at 50Hz).

4.3 Undervoltage Inhibition Setting

The multi turn potentiometer on the right side of the front panel is used to set the undervoltage lockout threshold. The default setting for the relay at the factory is 80Vac. When the input voltage is lower than the set value, the "Undervoltage Inhibit" red LED will light up and all frequency protection logic will be locked. It is recommended to set the minimum normal operating voltage of the PT secondary circuit on site, usually around 60% to 70% of the rated voltage.

On site testing and verification methods

Testing relays before commissioning or during regular maintenance is a crucial step in ensuring their reliability. Testing usually requires a variable frequency voltage source and timer.

5.1 Frequency accuracy verification

Connect the voltage source to the sampling input terminal of the relay according to the test wiring diagram.

Set the dip code of a certain set point (such as set point 1) to 60.00Hz and turn the O/U switch to "U" (under frequency).

Input rated voltage (such as 120Vac) that is higher than the undervoltage lockout value, and set the frequency to 60Hz.

Slowly decrease the input frequency and closely observe the "Pickup" LED. When the LED is just lit up, read the frequency source display value, which should be within the range of 60.00 ± 0.01Hz.

Using the same method, turn the O/U switch to "O" (overclocking), slowly increase the frequency, and verify the accuracy of the overclocking action.

5.2 Delay accuracy verification (cycle mode)

The verification of delay accuracy should pay attention to the characteristics of the "cycle" mode: actual delay=(dial value x multiplier)/current frequency.

For example, set to 11 cycles (S7 configuration x1, cycles), with an input frequency of 53Hz.

Expected delay=11/53 ≈ 0.2075 seconds.

During testing, step down the frequency from 60Hz to 53Hz and measure the time from the Pickup light to the output relay action. The error range should be within 0.2075 ± 1 cycle (approximately ± 20ms).

5.3 Verification of undervoltage locking function

Set the frequency slightly below the rated frequency (such as 59Hz) to ensure there is a frequency anomaly signal.

Adjust the undervoltage lockout potentiometer to a certain value (such as 80V).

Slowly reduce the input voltage to below 80V. Observe that the 'Undervoltage Inhibit' light is on and the frequency protection should not be activated (Pickup not on, no output).

Raise the voltage to above 80V, unlock, and the frequency protection should be able to operate normally.

Common problem troubleshooting and maintenance suggestions

Possible causes investigation and handling of fault phenomena

The power indicator light is not on. If the power supply is not connected or faulty, check if the voltage at the power terminal meets the nominal value on the nameplate and check the external fuse.

When the frequency is abnormal, the Pickup light does not light up and the undervoltage lockout action is checked to see if the "Undervoltage Inhibit" LED is lit. If it lights up, measure whether the input voltage is lower than the lockout setting value. If it is not a locking issue, check whether the frequency setting dialing is accurate.

Confirm that the Pickup light has been steadily lit and the duration exceeds the delay setting if the output relay does not operate and the delay has not arrived or if the contact is stuck. Check the output contact wiring and external circuit voltage. If it is a current type target, check if the tripping current is greater than 200mA.

Delay not accurate (large difference) S7 switch configuration error. Pull out the chassis and check the status of S7 switch. Confirm whether it is in "Cycles" or "Seconds" mode, and whether the magnification (x1/x10/x100) is correct. Misunderstanding 'Cycles' as' Seconds' can result in significant delay deviation.

The target indicator does not light up. For models equipped with Current Operated Target, it is necessary to ensure that the current flowing through the target coil is at least 200mA. If the circuit resistance is too high or the CT ratio is not suitable, the circuit design needs to be corrected.

Maintenance precautions: For unused spare parts stored for a long time, it is recommended to power them on every year for 30 minutes each time to maintain the performance of the internal electrolytic capacitor and prevent moisture degradation. The storage environment should be dry and dust-free, with a temperature range of -65 ° C to+100 ° C.