If a certain VEMS ECU is ordered with "Dual WBO2 requested" (option, or order comment), this should NOT be needed.
Provided for reference (during some debug/diagnostics, or if converting an old device ordered without Dual WBO2).
2nd WBO2 hardware channel on v3.x. Verification of this doc is in progress, use GenBoard/VerThree/Schematic for now.
Problem: When I bench test/calibrate:
- GOOD: Gnd to pump- is 4V as desired both controller channels
- GOOD: pump- to pump+ is -2mV, as desired both controller channels
- OOPS: pump- to nernst is ~260mV and I can't get the value up near 450mV no matter what I use for wbo2_nernst_dc_target.
I notice the second heater stops heating when the pump- to nernst goes positive (when it normally goes to 450mV).
Thoughts on this? I'm using 2 resistors ( pump- 100 Ohm nernst 100 Ohm pump+), as outlined in the Hardware Test page.
- Should I use the 100 Ohm resistors on both channels at the same time ?
- we definitely test that way. Please try,
- and measure resistor values (just in case), and pump+ voltage also (double of nernts, when measured from pump- as a base)
- although should work to calibrate them individually
I'll document the process similar to GenBoard/Manual/WideBandHardwareTest once I understand what I'm missing with this dual wideband testing.
First we review your actual configuration
- 2nd WBO2 enabled ? most likely, but please check
- [dummy config] (outputs disabled), enable 2nd WBO2 manually
- please provide link to vemscfg or vemslog. It might not be impossible to reporoduce the setup that way. (although something simple HW thing is more likely, like something interfering near EC18 /1 ?)