Dynomotion

Group: DynoMotion Message: 7086 From: az9633@ymail.com Date: 3/21/2013
Subject: Snap amp fault
I have a 2 axis microstepper Snap Amp system I just started up and I get no power to the motor.
Snap amp status reads
Snap Amp fault
amp 0 overcurrent fault
amp 1 overcurrent fault
The second LED on the Snap amp is on solid along with the flashing one

This happens even with the motor leads disconnected at the drive connector

I can get it to reset if I shut off the Stepper power supply and wait for it to drop out
During power down I lose the overcurrent faults after a while but the amp fault stays then finally it too drops out.

As soon as I apply stepper bus power I get the fault.

As soon as I apply 5v to the K flop before applying power to the amp I get the fault light. This stays there until I initialize the peak current of the SnapAmp. The clamp voltage is 80, the bus supply is 60. The motors are designed to run on 170 v bus so thier inductance must be pretty high. The snap amp fault light comes on as soon as the 60 v bus power is applied.


Stepper amplitude is 40, The motors are rated at 1.9 amps
Peak current is 5

The power connections are labeled Vs and Ground. My assumption was the + 60 volts goes to both Vs connections and the 0 volts from the same power supply goes to the Ground connection but not to earth ground. The 60v bus supply is not grounded.

What should I do now?

AZ
Group: DynoMotion Message: 7089 From: TK Date: 3/21/2013
Subject: Re: Snap amp fault
Hi AZ,

Try a Peak Current Level setting of 9 or 10.

Those power supply connections are correct. 

Regards
TK

On Mar 21, 2013, at 9:09 PM, "az9633@..." <az@...> wrote:

 

I have a 2 axis microstepper Snap Amp system I just started up and I get no power to the motor.
Snap amp status reads
Snap Amp fault
amp 0 overcurrent fault
amp 1 overcurrent fault
The second LED on the Snap amp is on solid along with the flashing one

This happens even with the motor leads disconnected at the drive connector

I can get it to reset if I shut off the Stepper power supply and wait for it to drop out
During power down I lose the overcurrent faults after a while but the amp fault stays then finally it too drops out.

As soon as I apply stepper bus power I get the fault.

As soon as I apply 5v to the K flop before applying power to the amp I get the fault light. This stays there until I initialize the peak current of the SnapAmp. The clamp voltage is 80, the bus supply is 60. The motors are designed to run on 170 v bus so thier inductance must be pretty high. The snap amp fault light comes on as soon as the 60 v bus power is applied.

Stepper amplitude is 40, The motors are rated at 1.9 amps
Peak current is 5

The power connections are labeled Vs and Ground. My assumption was the + 60 volts goes to both Vs connections and the 0 volts from the same power supply goes to the Ground connection but not to earth ground. The 60v bus supply is not grounded.

What should I do now?

AZ