Blown CIM?

[Ether]

Originally Posted by Ether

If you have 2 known good CIMs and a 2-motor gearbox, you could try the following:

1)

If you have a suitable encoder, install it on the gearbox.

Install the two good CIMs into the gearbox (with no load on gearbox). Run CIM1 with full voltage, and measure the voltage output of CIM2 (unshorted leads). Record the CIM1 applied voltage voltage, the CIM2 output voltage, and the encoder RPM. Now repeat with CIM2 powered and measure CIM1. Record those measurements. This is your baseline.

2)

Replace CIM2 with CIM3 (suspected bad). Repeat #1 and post your measurements here. Replace CIM3 with CIM2, and CIM1 with CIM3. Repeat #1 and post those measurements here.

3) Install the 2 good CIMs (CIM1 and CIM2). Short the leads of CIM2. Apply full voltage to CIM1 and record the encoder RPM. Replace CIM1 with CIM3 (suspect motor) and repeat. Record the encoder RPM. Post your measurements here.