Basler BE1-50/51B-217, Instruction Manual, Page: 48 / 49

BE1-50/51B-217 Maintenance
6-2
This protection scheme also allows one unit at a time to be withdrawn from service for testing purposes
without loosing protection during the test. Refer to Section 5 for recommended test setups.
Periodic Test
Periodic testing should consist of the following procedures.
Step 1. Verify that the instantaneous pickup is within ±2% of the value set on the dials. Pickup occurs
when the INST output contacts close.
Step 2. Verify that the time pickup is within ±2% of the value set on the dials. Pickup occurs when the
LED turns ON.
Step 3. Verify that the time to trip for the curve and time dial settings at a multiple of six is the same as
the time given on the characteristic curve. Refer to Section 1 for the characteristics curves.
Step 4. Verify that the time to trip for the instantaneous element at a pickup multiple of 2 is not greater
than the time given on the instantaneous characteristic curve. Refer to Section 1 for the
instantaneous characteristic curve.
Step 5. Verify that the 51 AUX contacts close when the time overcurrent element trips.
Step 6. Verify that the targets operate with one ac ampere of trip current in the trip circuits and that they
can be reset using the RESET LEVER.
This completes the periodic test.