While operating the MR 329 The operator lost boom down function. Fault Code 2074.25501 was listed in messages. The Potain Fault code app had no definition of the fault code. I instructed the operator to turn off the crane and restart it. When the crane was running again the code was cleared and the crane regained boom function.
Attached is the Code and the code description from Potain.
Shunt code for Topsite shunt when activated is 8528
This code can be any code you choose, in an attempt to standardize the shunt code please make it 8528 at the time of setup.
Currently the shunt code for the MDT389 SN: 627012 is 1025
Operator stated crane lost all functions. Found the LMI, and drives were all on with no codes. Looked in the CAN network of the LMI and saw the slew encoder wasn’t pairing,
this was confirmed by a blinking green and red light on the encoders.
There was evidence of corrosion on the encoders,
and it was decided to replace the encoder assembly. Once it was replaced, we cleared the old encoder addresses and paired the new encoder and the crane regained functionality.
Moments later the crane stopped working again. The operator said all of his LMI information wasn’t present (hook position, weight on hook, and trolley location)
the drives were all operational but there were multiple faults codes being thrown. CAN Saturation, CAN Sense codes, and various codes relating to trolley, hoist and load.
The CCL plug was disconnected to test if the load pin, hoist or trolley were faulting the can network. When the crane was restarted the fault codes stopped happening, and the slew function was regained. We also put the crane into fitting mode, this allowed us to test functions without the use of the CAN network. We also saw that the encoders for the hoist, Tolley and load pin were being seen then shutting down then being seen on the CAN open network screen of the LMI.
It was decided to remove the CAN H and CAN L from the CAN Sense connection one at a time from each encoder by connecting the CAN H to CAN H and CAN L to CAN L leads that come in and leave the encoder (taking the tested encoder out of the circuit) until functionality was regained and a loss of an encoder was recognized on the CAN Open Network.
The hoist encoder was the first tested, and when we removed the hoist encoder from the network, the CAN network connected to the trolley and load pin and showed the hoist was offline, the LMI regained load information, and trolley position, and the hoist encoder wasn’t being recognized.
The Hoist encoder was replaced, the new encoder was paired, 
and the hoist min height was re-taught. The crane regained functions.
Minutes Hour and Minutes+Hour
If it is 10:30 in the morning, it would be:
301040
There are 4 pins that connect the tower head to the turntable. Near these pins there are 4 bolts that apply torsional pressure against the pins. The Operator Manual says to tighten the bolts then back them off 1/4 turn and set the jam nut. Blake Smith from Potain recommends these bolt be tightened and not backed off. Throughout operation of the crane occasionally re-tighten these bolts. The pin connections will pop as has they “seat in” during operation and will eventually quiet. This is a common issue with new 389 cranes.
Crane would shut off intermittently. Red circle would display in the bottom right, but turn back to green circle right away. There were no active faults, but fault history showed Emergency stop chain : Incoherent state.
The emergency stop switch has NO and NC contacts. The fault means 1 set of contacts are acted on, but the other contacts are in “normal” state. (For example NC contacts are closed, but NO contacts are also closed).
The only e-stop that will register this fault would be the one on the armrest (per JP). Could be the e-stop or the joystick itself. The joysticks are the same, so swap to test.
Operator lowered the block down, and then the hoist drive stopped. Could swing and trolley, but no hoist or lower function. Drive displayed SAFF. This fault is not in the Hup manual. The fault code app shows the following.
Had the operator verify that the CanOpen card was installed all the way. Had the operator switch ports on the CanOpen card, and the crane began working. Went to the crane and replaced the CanOpen card, and verified both ports are working
Hoist suddenly stops, and often will not restart until several attempts later. E68 code is displayed on CCS messages. It means that the KEB hoist drive releases the brake, and looks for the microswitch contact within 600ms (.6 seconds). If it does not, it will fault. Follow the steps below.
Hoist Brake Microswitch Adjustment
Also with this situation, the operator claimed the load would drop slightly. Was able to verify during startup, K405A (validated drive contactor) would close and K409M would energize allowing the brake to release, then the drive would shut down. Could recreate and U400X #29 was supplying +24VDC at startup to energize K409M. This comes directly from the drive, replace hoist frequency drive
Crane starts, but will not swing. the Green Square is flashing on bottom right of LMI. Swing drive has 3 fault codes, AFE1 AFE2 and FBA A Missing.
For AFE! and AFE2 see link.
https://service.rockymtncranes.com/2022/09/07/afe1-and-or-afeb-faults-on-start-up/
Replace the memory stick, and had to force the K600M to stay active for complete download of the memory stick to the drive, and then restart crane. Crane swings and weathervanes properly.
