[philso]

We observed some strange behaviour with our Spike relays today. I was unable to find any threads describing symptoms similar to what we saw.

With the Spike in the "Off" state, we observed the LED on the Spike was orange and the voltage across the output terminals was 0Vdc.

We energized the Spike with no load connected an observed the LED on the Spike turn green. The voltage on output terminals was about 11Vdc. The input voltage was 12.45Vdc. When we connect an AndyMark 9015 motor to the Spike output terminals, the voltage goes to 0Vdc and the LED turns orange. The M+ terminal is at 0Vdc with respect to the GND terminal. Disconnecting the PWM cable from the Spike does not change anything.

We observed this behaviour with two different Spikes, one removed from a working robot. We swapped the PWM cable even though we seem to be able to control the Spike. One Spike had a 20A breaker. One Spike had a 20A fuse that appeared good.

We checked the wiring and found that the connections from the PD Board are correct and the orientation of the PWM cable is correct.

We did not happen to note the behaviour of the LED's on the DSC.

Does anyone have any ideas on what we may be doing wrong or what to look for?

Thanks.

Phil