Procedure 6.6 - Troubleshooting The Lift System - Precor EFX5.31 Instruction Manual

Procedure 6.6 - Troubleshooting the Lift System

Note:
The lift motor is disabled when the EFX is not being used. The speed sensor must detect motion
in order for lift operation to be enabled. In the following procedures, when lift motor movement is
being tested the stairarms must be in motion. Before performing this procedure, ensure that the
speed sensor is operating normally per Procedure 6.3.
1. If the lift motor will not move skip to step 7. If the lift motor moves and an error occurs
continue with step 2.
2. Access the diagnostics program per Procedure 2.1 and proceed to the lift calibration portion
of the diagnostics program. If the lift calibration number is 0 or 255 skip to step 3. Operate
the lift, if the lift calibration number does not increment as the lift moves, skip to step 3. If the
calibration number increments as the lift moves, re-calibrate the lift per Procedure 5.3. If
re-calibration does not correct the problem, continue with step 3.
3. Set the on/off switch in the "off" position. Remove the lift position cable connector from the
lower PCA. Using an ohmmeter, measure between terminal 1 (brown wire) and terminal 3
(blue wire). The measurement should be approximately 1KΩ.
4. Using an ohmmeter, measure between terminals 1 and 2 of the lift position connector and
measure between 2 and 3 of the lift position connector. The two measurements should total
approximately 1KΩ. If any of the readings are open (∞) or significantly high, check the lift
motor cable and connectors. Repair any wires or connections that are bad. If the cable and
connectors are good, replace the lift motor.
5. If you have performed all of the above tests and an error still occurs when the lift motor
operates, there are four 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 the lower PCA, the
upper data cable, the lower data cable and the upper PCA. Replace only one part at a time.
If the new part does not correct the problem, replace the original part.
6. If you have performed all of the above tests and the lift system is still not functioning, call
Precor Technical Support.
7. Set the on/off switch in the "off" position. Remove the F1 lift fuse (2 amp slow blow) fuse
from the lower PCA. Measure the fuse with an ohmmeter. The measurement should be 1Ω
or less. If the fuse is good, re-insert the fuse and skip to step 9. If the fuse is open (∞) or
significantly high, replace the fuse. Before operating the lift motor it is necessary to perform
a continuity test on the lift motor.