XR125 4
If the alarm output and/or LED indicate a fault (RED):
1. Remove an end sensor plate or the second sensor, and use the
built-in gauge to check the location of the rotor (see Figure 2.1).
Ensure the label marked “This side out” is facing away from the
motor.
2. Remove the XR125 sensor from the housing. Clean the housing
mounting surface for the XR5 sensor and the XR125 housing. Ensure
the XR5 sensor is directly mounted on the XR125 housing, with no
sealant, gasketing, or other materials, and is firmly bolted in place.
If the alarm output and/or LED indicate a fault (RED) on a properly
mounted XR125 sensor and the rotor is properly located, replace the
XR125 sensor.
An oscilloscope can also be used to verify proper output of the
XR125 encoder at the encoder connector itself and at the drive/
controller cabinet. If the outputs show large variations in the signals
at steady speed (jitter or “accordion effect”, see figure below), check
rotor position. If the rotor position is correct, the motor or shaft may
be highly magnetized. Replace any magnetized material nearby
with non-magnetic material (aluminum, stainless) (shafts, etc). For
GE CD frame motors and similar styles, Avtron offers non-magnetic
stub shafts (included with all “U” style rotor kits). If variations
persist, consider replacing the sensors with super-shielded models,
option -004.
STATOR HOUSING REMOVAL
To remove the stator housing remove the qty 4 5/8-11x4” bolts
holding the housing to the motor. Take care that the housing does
not fall from the pilot and cause the sensors to crash into the rotor.
Damage to the sensor or rotor could result.
ROTOR REMOVAL
Remove shaft rust and burrs before removing the rotor.
THROUGH-SHAFT TA-T9 MA-M9 styles: Loosen the set screws
holding the rotor to the shaft. Remove the rotor by hand, taking care
not to damage the outer magnetized ring.
If the rotor can not be removed by hand, use a gear puller taking
care not to damage the outer magnetized ring.
VARIATION > ± 15%
PHASE A
PHASE B