Breaker moved, but no times appear on the result screen

1. First check if the time fracture is working properly (hardware)

The method is to short-circuit and measure the fracture surface (A1-N1), check whether the status indication on the instrument testing interface lights up with the short-circuit (solid), and turns off with the disconnection of the short-circuit (hollow)

If the icon changes correctly, the contact is electrically healthy.
Should any channel fail, simply move the leads to one of the remaining channels (all 12 or 6 are independent). When convenient, return the analyzer for repair.

2. Check that the recording time is long enough for a single C or O operation (software setting).

The recording time must be much longer than the actual close or open time to capture the full sequence of contact state changes, travel curve, and coil-current curve. Never set it too short. In most cases leave it at the default; if the close time is unusually long, increase the recording time accordingly.

Attachment: Closing test time: refers to the time for closing control pulse output and data acquisition (the same applies to opening).

Close time: the interval from the instant the breaker receives the close command (energizing of the close coil) to the instant the arcing contacts touch (the “make” point). After this make-point the contacts continue moving until they reach the fully closed (over-travel) position. Therefore the total close-test recording time must be much longer than the close time itself (same rule applies to opening).

3. Check if the test circuit is complete (external circuit)

In conventional mechanical characteristic tests, one or both grounding switches are usually opened. If there are no problems with the hardware and settings of the instrument, the test line should be checked for any broken wires, as well as the good contact between the test line (or high-altitude wire clamp) and the circuit breaker wire; If one side of the knife switch is grounded and used as a common terminal circuit (i.e. N1 grounded), the problem of increased resistance caused by oxidation of the grounding knife switch needs to be considered. In this case, connecting a test line to instrument N1 on the wire between the knife switch and the circuit breaker can solve this problem.