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Guest · 2014-06-06T02:29:00Z

5000# @ 200fpm vvvf 5 landings 175' rise We replaced the sheave brake coil due to a shorted coil. The car was above the top floor on the directional limit. IO showed no SAF3, This says the car safety circuit is open. OVL, HS, CS, ICS all high. Power to the SAF3 output module, no power out. Replaced all modules with known good. Still no SAF3. No faults showing. Pulled cpu board and took out program chips and installed into spare cpu (same part no, but earlier version h vs. f). Car came up and SAF# was hot. Tried to run on insp and car reacted violently. Thought that trash in the spare cpu might have caused this, so I put the software back into the original board. Car booted and SAF3 was hot. Ran car on insp from the MR and things seemed normal. Put the car in auto and it started down, but did not stop at the next floor and continued to the bottom. The selector did not advance with the car movement. The car stopped on the bottom dir limit. Rebooted the cpu and the car leveled into the bottom floor and selector showed the first floor. Tried to go to 2 and the car took off and immediately slowed down and stopped after about 14' run. SAF3 went low. Selector showed first floor. Doesn't the governor encoder tell position? Or does the motor encoder? Both show direction and speed, but if I do a VEL, the car and governor show a difference of 20fpm. Any thoughts?

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Johnny

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Topic starter 09/06/2014 11:15 am

Job has NTS and ETS toothed cam running thru sensors. DSP voltage 5.2VDC All three Pico fuses good. I have tried eliminating EN-81 with no good results.

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sbrmilitia

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09/06/2014 10:48 pm

What fault are you getting? 109, 143, 102, 103, or 116? All these faults are associated with SAF3 opening. SAF3 is controlled by the car CPU. It's function is to tell the car CPU is functioning and car CPU detects no safety critical failure.

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Johnny

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Topic starter 10/06/2014 4:01 am

I'm not sure what faults are showing now. I'm going to the job tomorrow and will report. However, when I have the car with no SAF3 and I try to run, or break the safety circuit and remake same, there are no faults generated.

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sbrmilitia

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10/06/2014 4:25 am

You've checked the pico on saf3 and put a new module in it?

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Johnny

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Topic starter 10/06/2014 8:07 am

Yes. I'll know more tomorrow.

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Johnny

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Topic starter 11/06/2014 2:02 pm

EEPROM on the CPU was bad.

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jkh

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11/06/2014 11:32 pm

Glad to hear you found it.

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