Precor C354 Service Manual page 27

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C534, C534i Self Powered Elliptical Fitness Crosstrainerl
Procedure 6.5 - Troubleshooting the Generator (C534, only)
The generator performs three functions in the EFX. First, by controlling the amount of electrical
load applied to the generator, the user's pedalling resistance is controlled. Second, the generator
is used to charge the EFX's internal battery. Lastly, one of the generators three phase output
windings is monitored to determine when the unit is in use and when it is idle. This system also
determines the stride rate by determining the operating speed (output frequency) of the
monitored generator winding.
Warning
Because this is a self powered unit, it will either be necessary to either equip the unit with the
optional external power supply or have an assistant pedal on the unit while voltage
measurements are being taken. Because of the danger of working on the unit while it is in motion
using the optional external power supply is strongly recommended.
1. Perform the generator resistance test per Procedure 5.1 (C534) or Procedure 5.2 (C534i). If
any of the resistance measurements are significantly high or significantly low, replace the
generator.
2. The following voltage reading must be taken while the unit is in motion. Extreme care must
be taken to keep meter leads, hands, etc. clear of all moving parts. Using an AC voltmeter,
measure the voltage between M3 and M4, M4 and M5, M3 and M5 on the lower PCA. All
three AC voltage readings will vary depending on the unit's stride rate at the time the
measurement is taken. At a stride rate of 100 strides per minute, all three voltage readings
will be approximately 100 VAC.
3. If any of the three readings in step 2 are significantly low, replace the generator.
4. If you have performed all of the above tests and are unable to resolve the problem, contact
Precor customer support.
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