Precor TRM 811.v2, Service Manual

Page: 36 / 114

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Troubleshooting Tripped Breakers
It is extremely important to note whether the unit’s breaker trips or the wall outlet breaker trips. It
is also extremely important to note when the trip occurs:
- Immediately on power up
- After the belt starts but before the user walks on the belt
- After the user walks or runs on the belt.
If the unit trips the wall breaker:
1. Check the voltage coming from the wall. If it is approximately to 0V, the wall breaker has
likely tripped.
2. Inspect the line cord. If damaged, replace the line cord. If the line cord is not damaged
continue with the following steps.
3. Ensure that the AC line cord is attached correctly and secured to the treadmill with the
clamp.
4. Verify if two or more treadmills on the same wall breaker. This will be especially evident if
two or more treadmills shut down at the same time. To verify if multiple treadmills are sharing
the same wall breaker, manually turn off the wall breaker. If more than one treadmill loses
power, the treadmills are on the same breaker.
o
If YES, advise the customer to have their facility wiring upgraded per Precor
specifications.
o
If NO, continue with the following steps.
5. Verify the wall outlets do not share neutral wiring and that each wall outlet is on an individual
branch circuit. An individual branch circuit will have its own load line, neutral line and ground
line. Have an electrician verify if neutrals are shared or not.
o
If YES, advise customer to have their facility wiring upgraded per Precor
specifications.
o
If NO, Continue to step 6
6. Measure the AC input voltage with the treadmill unloaded (running belt moving, with no one
walking on the running belt) and then again while loaded (someone walking/running on the
belt). The difference between the two states should be no more than about 6 volts RMS, and
ideally less.
o
If the voltage variance is more than 6 volts RMS, the distance of the branch circuit
wire runs may be very long or may have used smaller diameter wire. Recommend to
the club that they should consult with an electrician if this is suspected.

If NO, Continue to step 7.
7. Overloading is the most frequent cause of treadmill shutting down. Overloading is most often
caused by excess deck/belt friction, but can be made worse by line voltage conditions. This
condition happens more often with heavier runners, but never walkers. In high user clubs (10
hours or more of use per day), the decks/belts will wear out much faster than at other
locations, sometimes in months rather than years. Follow the steps for errors as per
procedure,
Troubleshooting the Drive Motor System .