Sunday, January 08, 2017

Precor treadmill – Precor C932i - C946i – How to access diagnostic mode – How to troubleshoot motor driver circuit board

Accessing the Diagnostic Software
The treadmill's diagnostic software consists of the following modes:
# Display Test
# Keyboard Test
# Heart Rate Test
# Belt Speed
# Incline
Procedure
1. Plug the power cord into the wall outlet, then turn on the treadmill with the circuit breaker.
2. Using the RESET key and the numeric keypad, press keys RESET,5,1,7,6,5,7,6,1, sequentially.
3. Hardware Validation will scroll across the display followed by DISPLAY TEST
4. Press the OK key, the upper most group of LED’s will illuminate on the display. Check the display to ensure that all LED segments are illuminated.
5. Press the OK key four more times to display the remaining LED groups. Check each display group to ensure that all LED segments are illuminated.
6. Press the Clear key (C932i) or BACK key (C946i) then the  DOWN key , KEYBOARD TEST will scroll across the display.
7. Press the OK key, a representation of all of the keys on the console will be displayed. Pressing a key on the console will cause the representation of that key to go off. Press all of the keys on the console to ensure that all of the keys are functioning.
8. Press and hold the Clear key (C932i) or BACK key (C946i) for 3 seconds, then the DOWN  key, HEART RATE will be displayed.
9. Grasp both of the heart rate grips on the handlebar, after a couple of seconds the heart rate will be displayed in the heart rate display and flashing heart (C932i) or smart rate bar (C946i).
10. Use chest strap transmitter or a test transmitter to test the wireless heart rate function, after a couple of seconds the heart rate will be displayed in the heart rate and smart rate displays.
11. Press the Clear key (C932i) or BACK key (C946i) then the DOWN  key, BELT SPEED will scroll across the display.
12. BELT SPEED test. Press the OK key, the console will display the power bits (PWRB), Press the SPEED UP  key to start the treadmill running belt, the display will indicate the power bits, the elapsed time and the actual speed (in either miles per hour or kilometers per hour depending on the club parameters setting.
13. Press the DOWN  key, the console will display the motor current (AMPS), the elapsed time and the actual speed then the DOWN  key, INCLINE will be displayed.
14. Press the Clear key (C932i) or BACK key (C946i) to exit the belt speed test.
15. INCLINE test. The console will display the analog to digital (A/D) incline position number and the incline position in percent of incline. Press the inline UP/DOWN, keys to operate the incline through out its range.
16. Press the Clear key (C932i) or BACK key (C946i) to exit the incline test.
17. If the incline is greater than 0%, AUTOLEVEL will be displayed and the incline will return to 0%.
18. Press the RESET key or the CLEAR key (C932i) or the BACK key (C946i) to exit the hardware validation test.
Troubleshooting the 3 Phase A.C. Drive Motor System
Circuit Description

The power control module converts single phase 120Vac or 240Vac into three phase variable frequency current for the A.C. drive motor. The motor speed is controlled by controlling the frequency of the drive motor current.
1. When taking voltage readings of the A.C. drive motor current, the readings will not be accurate because of the frequencies being used. However, they are indicative of the presence of drive motor voltage and relative frequency changes.
2. If the symptoms are the drive motor starts when you force the running belt to move and once running the drive motor runs “rough”, skip to step 10. If the drive motor will not start continue with step 3.
3. If the drive motor does not start, the power control module will only apply voltage for a couple of seconds before it shuts down. Therefore the voltage readings in the following step must be taken within the first couple of seconds after the treadmill is instructed to start the running belt.
4. Connect an A.C. voltmeter between terminals 4 & 5 of the OUTPUT connector on the power control module. Set the treadmill’s on/off switch in the “on” position. Press the QUICK START key. If the power control module is supplying output, you will momentarily read approximately 55 Vac. Set the treadmill’s on/off switch in the “off” position.
5. Repeat the procedure in step 4 between terminals 4 & 6 of the OUTPUT connector on the power control module.
6. Repeat the procedure in step 4 between terminals 5 & 6 of the OUTPUT connector on the power control module.
7. If one or more of voltage readings in steps 4 through 6 are not present, replace the power control module. If the voltage readings in steps 4 through 6 are present, continue with step 8.
8. Set the treadmill’s on/off switch in the “off” position. Disconnect the drive motor connector from the OUTPUT connector on the power control module. With an ohmmeter, measure between terminals 4 & 5, 4 & 6 and 5 & 6 of the drive motor connector. Each reading should be approximately 2.5Ohms. If any of the readings are significantly high or open, replace the drive motor.
9. Connect an A.C. voltmeter between terminals 4 & 5 of the OUTPUT connector on the power control module. Set the treadmill’s on/off switch in the “on” position. Press the QUICK START key. If the power control module is supplying output, you will momentarily read approximately 55 Vac.
10. Repeat the procedure in step 4 between terminals 4 & 6 of the OUTPUT connector on the power control module.
11. Repeat the procedure in step 4 between terminals 5 & 6 of the OUTPUT connector on the power control module.
12. If one or more of voltage readings in steps 4 through 6 are not present, replace the power control module. If the voltage readings in steps 9 through 12 are present, skip to step 8.