Before proceeding, carefully read the | |
DescriptionVacuum pump thermal circuit breaker active | SeverityModerate02 / 05 |
Authorized personnelMachine operator | Required PPE:  |
Description
Fault in the worktable lifting system; the motor protection circuit breaker for the vacuum pump has tripped. It protects the system against both short circuits and overloads. To reset the circuit breaker, move the selector to 0 and then to 1;
Symptoms
…..
Possible causes
The causes can be divided into problems Mechanical or Electrical
Mechanical problems:
Vacuum pump motor jammed; try starting the vacuum pump and check whether it actually rotates.
The vacuum pump tank is empty
Electrical problems:
Short circuit between motor phases;
Missing phase;
Short circuit in the motor windings;
Faulty circuit breaker or current threshold set to an incorrect value
Possible solutions
MECHANICAL
First, check that the motor cooling fan rotates freely; for example, try moving the fan with a screwdriver. If it is jammed, it is necessary to
Fill the tank up to the overflow level
ELECTRICAL
Check that there is no continuity between the phases; disconnect the cable from the pump electrical box, insulate the terminals, reset the circuit breaker and activate the oil pump. If it trips, the problem may be the cable;
Measure the input voltage with a multimeter and verify that all phases are present. If, for example, one phase is missing, check that all terminals are tightened;
If, when carrying out the test in point 1, the circuit breaker does not trip, connect the cable to the pump. If the circuit breaker trips when the pump is started, the problem is the pump and it must be replaced;
If, after carrying out the previous tests, the motor protection circuit breaker continues to trip, the problem may be the circuit breaker itself. In addition, the threshold must be set to 4 A
