Basler Electric BE1-59N - Manual (Page 37)

Step 16. Adjust the 150 or 180 Hz voltage (at terminals 6 and 7) to above pickup (i.e., UNDERVOLTAGE
LED OFF).
Step 17. Set the UNDERVOLTAGE TIME DIAL for any convenient delay. Reset targets (if present).
Step 18. Reduce the sensing input below pickup (or disconnect it) while noting the time lapse before the
undervoltage relay(s) trip. Check that response time is the TIME DIAL setting ±525
milliseconds.
Step 19. Connect a 150/180 Hz source to relay terminals 6 and 7 as shown in Figure 5-1. Note that this
setup allows rapid switching from a voltage that is approximately twice pickup to a voltage that
is ΔV lower than pickup. The switching also provides a means of precisely verifying the time
between the voltage step change and the resulting output response.
Step 20. Set the UNDERVOLTAGE TIME DIAL to the desired characteristic curve. (Reference Figure 1-
4.)
Step 21. Adjust the voltage output of T2 to twice that of T1.
Step 22. Decrease the voltage of T1 by an amount that represents any ΔV of interest.
Step 23. Press and release S2 (of Figure 5-1) to assure that K1 is de-energized. Reset the timer. Press
S1. The time recorded by the counter should be within 5% or 25 milliseconds (whichever is
greater) of the time given in Figure 1-4.
Step 24. By changing ΔV, steps 22 and 23 may be repeated to verify any segment of the characteristic
curve that is of interest.
NOTE
Steps 16 through 18 apply only to relays with undervoltage definite time delay. If
not so equipped, proceed to the note following step 18.
NOTE
The remaining steps of this procedure apply only to relays with undervoltage
inverse time delay. For all other relays, the operational test is concluded.
9171400990 Rev K BE1-59N Testing 5-3