Why does the beam of the electronic universal test machine only lower but not raise

examineElectronic universal testing machineWhether the upper limit switch of the beam has been damaged, and if it is damaged, replace the limit switch. The beam moves in the opposite direction: it may be an error in the test machine software, please contact the manufacturer in time
The painted surface is incomplete, not smooth, uneven and inconsistent tones, including freckles, wrinkles, air and adhesions.
Pressing the lift button beam of the universal tester did not respond:
1) The emergency stop button is pressed and pull up the emergency stop button.
2) Thermal relay protection, open the electrical control cabinet, reset the thermal relay, and the upper and lower limit switches of the cross beam are broken: replace the limit switch.
Turn on the power supply of the test machine. If you don’t hear the “drip…” sound, it means that the power supply is not normal. The processed surfaces of the electronic universal testing machine parts have rust, burrs, bumps, scratches and other defects.
The appearance surface of the electronic universal testing machine has protrusions, depressions, rough and unevenness and other damages that are not marked. The counterscrew protrudes on the outer surface of the part, and there is a significant eccentricity between its head and the counterhole. The paint and putty of the test machine are not strong enough, cannot resist oil and corrosion, and may cause peeling and falling off.http://www.hssdtest.com/