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Mazak MK II 2.5 kW

Mazak MK II 2.5 kW

Mazak MK II 2.5 kW

Hi everyone,

we have problem on above mentioned machine. It shows turbo blower 300 T/B alarm on main display. We checked oil, changed gas completely, leaking gas, ... etc., but without success. In past, we avoid this problem with few turn off/on-s, after which machine started successfully, but now that's not working either.
There is also error 21 on oscillator and when high voltage is applied the current goes to 98A then drops to zero (think the normal is 40-50).

Does anyone have any other tip, or blower is dead and we need to call mazak?

RE: Mazak MK II 2.5 kW


Did you resolve it? sounds like the booster rotor or motor bearings are failing.
what are the amps before the HV is switched on?
Do the amps immediately jump straight up when the HV is switch on or is it gradual?

RE: Mazak MK II 2.5 kW

Nope, but we managed to start machine up and now it's on non-stop for 7 days and cutting fine.
The problem still exists after machine is completely off.

About amps, thy are gradually rising to 96-98A and instantly drops to 0 after.

RE: Mazak MK II 2.5 kW

Weird, might be the yaskawa drive, unlikely the booster will load right up & then come good for a week.
you might want to tong the 3 phases coming out of the drive that feed the booster motor.

how many hours on the booster?
compare the actual load (tong meter) to the VFD load on the display

if the tong also show the amps climbing then the booster needs looking into more (maybe it's heating right up, cooling problem maybe?)

If the tong shows stead amps when the VSD is climbing then the VFD is probably shagged.

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