Q&A Forum
Just curious does the 2011 BMW DSC control ABS also or seperate ABS module for front/rear wheel speed sensors?
Mmm interesting.. maybe when you adjust PID then you can get Works better everything. i'd say test a car, just at lower rpms. let say 2.000rpm and go to 10% keep to acelerate then go to 0% and see what happens. be carefull to go to high percentage because it can brake suddendly complete the car.
Hi Edgars,
Could you try with a potmeter on the control signal? I wonder if you have some ground current somewhere that causes ground to not be 0V. 0V control signal should definitely be 0V output. You will not be able to do retardation runs to calculate drive train losses unless the brake is completely off.
I understand that I can't do normal retardation runs. Tested it with pot and it behaves 100% the same. even with 0V on skpc200 it still got 60V on retarders. But if I move pot very really slowly till 0V then also on retarder voltage goes to zero. If I move it faster then voltage drops till maybe 30V and after some kind of margin voltage jumps up to 60V and I can move pot till 0V without any changes on output voltage to retarders.
I understand that I can't do normal retardation runs. Tested it with pot and it behaves 100% the same. even with 0V on skpc200 it still got 60V on retarders. But if I move pot very really slowly till 0V then also on retarder voltage goes to zero. If I move it faster then voltage drops till maybe 30V and after some kind of margin voltage jumps up to 60V and I can move pot till 0V without any changes on output voltage to retarders.
Hi, have you worked out why your thyristor gate Vgt is holding on 60volts at the retarder ?
No, I have not.
I have put AC noise filter on Semikron 11.,12.pins. On Retarder RC filter (4.7uF 250V capacitor and 22ohm 10W resistor), but still the same. I am running out of ideas. Nobody is using Semikrons?
Hi , don't know what pins 11 and 12 on your Semikron Thyristor , cant find it on the spec sheet link you posted to the website. All l know is for switching magnetic loads you need a parsitic diode between the source and drain of your thyristor mofset to suppress the noise. All i could find was this picture and it looks like there is a diode from S to D. So i will assume it has a internal parasitic diode in it. Maybe im wrong. Sorry i can't help.
No, I have not.
I have put AC noise filter on Semikron 11.,12.pins. On Retarder RC filter (4.7uF 250V capacitor and 22ohm 10W resistor), but still the same. I am running out of ideas. Nobody is using Semikrons?
Have you measured gate voltages from pins 7 and 9 it should be 0v when brake is set zero, second you told that you are using skbh type semicron its not including same diode as skch type and you may have broken your thyristors because recoil voltage from brake coils.
No, I have not.
I have put AC noise filter on Semikron 11.,12.pins. On Retarder RC filter (4.7uF 250V capacitor and 22ohm 10W resistor), but still the same. I am running out of ideas. Nobody is using Semikrons?
Have you measured gate voltages from pins 7 and 9 it should be 0v when brake is set zero, second you told that you are using skbh type semicron its not including same diode as skch type and you may have broken your thyristors because recoil voltage from brake coils.
Pins 7 and pin 9 of the SEMIKRON SKPC200-240 TRIGGER MODULE aren't connected to the gates of the SEMIKRON SKCH 28/12 Controlled bridge rectifier ? Maybe i haven't understood what you have worded ??? Pins 7 and 9 are connected to the ANODES A1 and A2 respectively on the thyristers of the SKCH 28.
Pins 8 and 10 of the SEMIKRON SKPC200-240 TRIGGER MODULE are connected to the GATES G2 and G1 of the thyristers respectively on the SEMIKRON SKCH 28/12 Controlled bridge rectifier.
I know you mentioned you have put a filter on the AC Mains Poer supply on pins 11 and 12. Maybe one on the retarders too.
Have a look where the load is on the two pictures i posted.
Can you also put a snubber circuit accross the DC postive and DC negative leeds that connect to the telma retarders. Suppressing the collapsing magnetic field inducing feedback into the system.
No, I have not.
I have put AC noise filter on Semikron 11.,12.pins. On Retarder RC filter (4.7uF 250V capacitor and 22ohm 10W resistor), but still the same. I am running out of ideas. Nobody is using Semikrons?
Have you measured gate voltages from pins 7 and 9 it should be 0v when brake is set zero, second you told that you are using skbh type semicron its not including same diode as skch type and you may have broken your thyristors because recoil voltage from brake coils.
Pins 7 and pin 9 of the SEMIKRON SKPC200-240 TRIGGER MODULE aren't connected to the gates of the SEMIKRON SKCH 28/12 Controlled bridge rectifier ? Maybe i haven't understood what you have worded ??? Pins 7 and 9 are connected to the ANODES A1 and A2 respectively on the thyristers of the SKCH 28.
Pins 8 and 10 of the SEMIKRON SKPC200-240 TRIGGER MODULE are connected to the GATES G2 and G1 of the thyristers respectively on the SEMIKRON SKCH 28/12 Controlled bridge rectifier.
I know you mentioned you have put a filter on the AC Mains Poer supply on pins 11 and 12. Maybe one on the retarders too.
Thyristor pins 7 and 9 are thyristor gate pins that are connected to trigger module g1 and g2 pins.
yes, I already did it: On Retarder RC filter (4.7uF 250V capacitor and 22ohm 10W resistor)
yes, I already did it: On Retarder RC filter (4.7uF 250V capacitor and 22ohm 10W resistor)
Ok, so you have filtered out the AC power source and the load. So these bases are covered.
Disconnect yourdyno ( blue box ) totally from the setup , You will have to manually bench check the pins on the SEMIKRON SKPC200-240 TRIGGER MODULE that control the two gates and two anodes.
Also manually bench check the SEMIKRON SKCH 28/12 Controlled bridge rectifier with a lower DC power supply battery 9 or 12 volts dc battery ) and multimetre and check the thyristers are operating properly as they should.
You only need Vgt 2 Volts minimum and Igt 100mA at operating temperature of 25c to switch ( Gates G1 & G2 ) on the thyristers. Even when you apply 2V DC to G1 and G2 you can disconnect them and the thyristers will remain on you have to disconnect the anode to switch the thyristers off. This makes it safe to test eliminating the potentially dangerous high operating voltages/amps if connected to AC mains supply. I suspect the anode side is faulty on either one or both of the units? Vigilance will get you through your diagnosing of the problem. Keep plotting away. Will be interesting to see what the final result is ?
Question to Jostein, could of the yourdyno cuased a issue when Edgars was using PWM mode and failed to select the transfer of the jumper inside YourDyno ? Just throwing out ideas ?
That gave me some information. Measured 5V output from yourdyno - Retarder - 192V.
If I move slider faster to 0V, then at retarder still stays 60V. I can plug off yourdyno, still 60V. Only when I plug of AC power source, then it goves to 0V.
If I move it slowly percent by percent at the end, then I can get retarder to 0V. I can move slider fast till 0,5V output and then I need to move it slowly. If I configure 0% - 0,45V and 100% - 5V, then I can move it fast how much time I ever wanted. Output to retarder goes from 1-3V to 192V and back. but still it has always aplied 1-3V on one side, other retarder even ~10V.
I made video for better explanation: https://photos.app.goo.gl/CFv38DCNsQCvwLZM6
not so good quality. If needed, I can upload on youtube HD quality.
Ok , have a look at the specification sheet for the thystor you are using gate thresholds hold voltage is 2 volts 100 mamps and you are applying 0 to 5volts which is no good ; you are exceeding the threshold gate voltage and the only way to switch off the load is once it passes the zero cross over voltage . Thats why around 2.5 to 3 volts you have 192Volts at the tema retarder before you reach the full scale of the 5 DC volts on the sliding potentiometer either manual use or via the yourdyno software.
Ok , while doing my 10km exercise walk tonight , I was thinking , when you apply 0 volts through to to 5 volts via yourdyno software ( or manually via a potentiometer) in increments of 1 volts to pin 6 on the SEMIKRON SKPC200-240 TRIGGER MODULE what are the actual measured corresponding output voltages at Pins 8 and 10 of the SEMIKRON SKPC200-240 TRIGGER MODULE going to GATES G2 and G1 of the thyristers respectively on the SEMIKRON SKCH 28/12 Controlled bridge rectifier.
My last post I assumed 5 volts input on pin 6 of the SEMIKRON SKPC200-240 TRIGGER MODULE resulted in 5 volts outputs on pins 8 and 10 on the SEMIKRON SKPC200-240 TRIGGER MODULE which connect to gate1 and gate2 of the thyristors. I assumed input voltage equaled output voltage ?