D. DAR, GVI and 7PC Adjustments
The following adjustment procedure must be done with an empty car.
1. With the diagnostic terminal connected to the CPU, set inspection speed (IVE) to be 10% of contract speed. Place meter leads on R+U and R-U> They are the 1st two pins of the J1 connector on the DAR board.R+U (pin 1)should have the positive (red) lead connected to it.
2. Turn AU pot on the DAR board so the arrow is at 3 o'clock.
3. Run the car up and down on inspection and monitor the DC voltage on the meter.
4. In the up direction adjust DZU parameter to get +0.100 volts. In the down direction adjust DZD parameter to get -0.100 volts. When finished, save the value of DZU and DZD by typing in'WRT'.
5. Place meter leads at test points 30TP to 63TP on 7PC board of the Magnetek drive unit. The positive lead should be on 30TP. Run the car up and down on inspection and monitor the DC voltage.
6. Adjust the OFFSET pot on the GVI to equalize the voltages in both directions.
EXAMPLE: If it is -0.9V in the down and +1.0V inthe up, adjust OFFSET so it is -0.95V in the down and +0.95 in the up.
7. Adjust the GAIN pot to bring equal values to +1.0V in the up direction and -1.0V in the down direction.
8. Run the car in either direction and monitor the Diagnostic Video Screen. Adjust the TACH CAL (75RH)pot on the 7PC so that the actual car velosity equals demand velocity. if the Diagnostic Video Screen is unavailable, dial 29 on the DAR board. LED'S 1 to 16 will indicate the speed difference in 1 to 16 FPM. Adjust the TACH CAL (75RH)pot so that at most only 2 LED's (FPM) show on the DAR.
9. Set inspection speed to be 0 FPM (IVE=0). Run car UP and DOWN. The car should hold zero speed in both directions. If the car "DRIFTS", adjust the ZERO TRACKING (80RH) pot on the 7 PC to hold zero speed for both directions. (Ignore the first "JUMP" you see as the brake lifts).
10. Run car on inspection at 20FPM. While the car is moving, type in IVE=) on the diagnostic terminal. The car should ramp right to zero speed and hold for at least 1/2 second. Try this in both directions . Fine tune ZERO TRACKING (80RH) as needed.
E. Digital Position Pulse (DPP) Verification
1. Connect voltmeter at pin 8 and pin 7 on J1 connector of the DAR board.
2. Run the car up and down on inspection at 50FPM. Monitor the DC voltage. It should be between 7.5 and 11.5 VDC.
3. If the voltage is lower than 7.5V, decrease the distance between the DPP sensor and the magnet on the Top
of Car Digitizer. if the voltage ishigher than 11.5V, increase the distance between the DPP sensor and the magnet.
4. Connect an oscilloscope at pin 8 and pin 7 on the J1 connector of the DAR board.
5. Run the car up and down on inspection at 50FPM.Verify that a square wave is present when the car moves. Also verify the amplitude of the square wave is correct. (see Figure 1 on the next page.) Note if an oscilloscope is not available, the above procedure may be bypassed.
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