Category: Potain MDT 219 J10

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Crane will not start – Three phase power missing

Operator complains crane will not start and the display shows Three phase power supply missing.  Check for incoming power and all 3 phases.  If power is correct on each of the three legs (277 VAC), check contactor K102M.  A1 terminal should be receiving 277VAC on the A1 terminal.  If that is correct, coil in contactor may be bad.   Remove wire from terminal 22, hold in contactor and start the crane.  If crane starts and runs, the contactor coil has failed.

To bypass contactor K102M wire the incoming and outgoing 3 phase wires together and disconnect terminal 22 on K102M. This will allow the crane to function until the K102M can be replaced.

Potain part # for K102M = 84034156

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HUP will not accept Zero Load

After software upfate, in which SCM and CCT were erased, crane would not accept Zero Load during teach in.  Need to repair loadpin, and re teach Zero load.

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Crane only moves at slowest speed with all functions

Customer was operating MDT crane with remote, but all functions were slow.  Had the following icon on the display of the remote:

Crane was in P+ mode, which allows for greater capacity, but slows function.  On the remote this is controlled with ” A-B ” switch.

In the cab this is controlled by the gray button on the top of the left joystick.

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Weathervane adjustment for MDT Tower Cranes

Make sure both motors are adjusted per instructions.

https://service.rockymtncranes.com/wp/wp-content/uploads/2020/11/FCR_brake-weathervaning__slewing_mechanism_encoder_GME-1.pdf

If the weathervane light does not display on LMI or the remote, adjust the microswitch as follows.

With the motor in weathervane and the brake is locked in the release position.  Adjust the blade that contacts the microswitch.  Careful to make sure the blade just contacts the microswitch and doesn’t smash the switch.