A. Overload overcurrent debugging: the thermal relay current adjustment knob, slowly to less than the actual working current direction of rotation, each rotation a little scale, interval 2-5 minutes or so, until the thermal relay action unit to stop working so far. And then reverse the rotation can be a little scale;
B. Phase loss sensitivity debugging: the unit to start again, and one by one off the unit knife switch fuse, so that the unit in two-phase electrical work. Observe whether the thermal relay can cut off the control power within 5 seconds;
C. Short-circuit test: This step is usually protected by the air switch of the power supply system. Generally do not field test (more dangerous) requires the power supply system must be equipped with air switch (air switch model preferred DW10 type, selected DZ type).
