Procedure 6.4 - Troubleshooting The Eddy Current System - Precor EFX 5.33 Service Manual

Procedure 6.4 - Troubleshooting the Eddy Current System

Note:
If the control circuit does not see an output from the speed sensor, it removes power from the
eddy current system. Therefore, when it is necessary to check the resistance or take voltage
measurements in the eddy current system it will be necessary to slowly turn the flywheels to
ensure that the power time out has not occurred.
WARNING
Before continuing with this procedure, review the Warning and Caution statements listed in
Section One, Things You Should Know
1. Remove the rear cover per Procedure 7.1. There are four typical symptoms concerning the
eddy current system. No resistance (pedaling resistance), no resistance shortly after power
up, incorrect resistance and error 50. If the problem is no resistance, continue with step 2. If
the problem is no resistance shortly after power up, test the speed sensor per Procedure
6.3. If the problem is incorrect resistance, skip to step 7. If the problem is an error 50, skip to
step 10.
2. Set the on/off switch in the "on" position, enter the manual program and set the resistance at
level 10. Using a DC voltmeter, check the voltage across the magnet wires at the lower
PCA. The voltage should measure approximately 25 Vdc. If the voltage is missing or
significantly low, skip to step 4. If the voltage is correct, continue with step 3.
3. Set the on/off switch in the "off" position. Check the magnet wiring per Diagram 8.1. If any of
the magnet wiring is reversed or incorrect the resistance will be affected.
4. Set the on/off switch in the "off" position. Using an ohmmeter, measure between the magnet
wires at the lower PCA. The measurement should be approximately 90Ω to 110Ω. If the
measurement is open (∞), check the connections at both magnets and the lower PCA and
the wires between the lower PCA and the magnets. The lower PCA to magnet wires must
read less than 1Ω when measured from end to end with an ohmmeter. Check the EFX per
Section Four.
5. If all of the wiring connections are good and there is still no resistance, there are two parts
that could cause the problem. There are not any good tests to check these parts other than
substituting a known good part. They are lower PCA and upper PCA. Replace only one part
at a time. If the new part does not correct the problem re-install the original part.
6. If you have performed all of the above tests and there is still no resistance, call Precor
Technical Support.
7. If the resistance is greater than normal, the cause could be mechanical rather than
electrical. Set the on/off switch in the off position and test the unit by checking all moving
parts in the drive section and stairarms for worn parts that could be "binding". Replace the
appropriate parts.
5.33 Elliptical Fitness Crosstrainer
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