What arm is it your using.
What was the robot doing leading up to this error.
What parts have you changed/checked.
What makes you think it's the power block.
Does this error appear in teach and repeat modes.
That error code is pretty reliable from memory regarding overcurrent.
- Motor shorted.
- Short across the UVW and ground leads between power block and motor.
- Diode inside the power transistor of JTx short circuited.
Well if the fault moved with the power block, then it's the power block.
- Could be the current sensor itself.
- Could be the IPM.
- Could be the power transistor.
Most common is the power transistor, either gone short or a free wheeling diode gone short.
Easiest way to check is:
- Turn off and isolate controller.
- Locate X3 on the power block, VDC measure across A1(P) and B1(N) and make sure PN is discharged.
- Unplug X3 connector completely.
- Locate XM2 on the power block and remove the connector (JT2 and JT3 UVW to motors are on this).
- Use diode check on DVM and measure between A2(P) on X3 and UVW (A1, B1, A2) on XM2.
- Use diode check on DVM and measure between B2(N) on X3 and UVW (A1, B1, A2) on XM2.
- If any of those bell out zero ohm's, then power transistor needs replacing inside.
Made an error above, and have modified the post for safety.
No because what you wrote makes no sense.
Do you know how a diode works and how you measure one using a DVM?
Sorry my mistake, I made another error on my post for the UVW terminals.........corrected now..... 
I opened the box and I measured directly on uwv and pn lines. More easy 
but the results are as my last post.
Well, I can only go from your feedback.
If you can:
- confirm/eliminate the motor windings (using a megger) and the motor disconnected has no shorts.
- confirm/eliminate the umbilical harness between power block and arm for no UVW and ground shorts.
- confirm/eliminate the readings between your 2 power blocks.
Then:
It could only be current sensor or IPM module on the main board inside the power block assembly.
Not really.
As you have 2 power blocks, you have known good components you could cold check against for comparisons.
You would be better stripping the power blocks down though and have access to the current sensor, IPM and power transistors for cold checking and comparisons against known good components.
If you don't have access to any spares, then this is the only direction to try and ascertain the faulty component and then you will have the problem in sourcing them as these are obsolete now.
I'll not advise anyone to try and run the robot whilst trying to measure specific areas of any circuit board components directly as hazardous voltages exist, especially in the power block.
The ipm is the HTC005/01 unit?
Yes, that is the IPM unit.
No problem, good luck with it......... 
Sorry.....making lots of mistakes tonight..........
Just to rectify a couple of things I've described incorrectly:
- Kawasaki refers the power transistors as IPM's.
- Kawasaki refers the power transistor drive circuits as HIC's.
