17
Troubleshooting Guide and FAQ
Problem:
Actuator does not move when step motor is energized.
Solution:
Step motor windings may be shorted. Use an Ohmmeter to
measure the resistance between pairs of windings (should be infinite)
and between the leads of each winding (should be the same for each
winding). Use your motor’s wiring diagram to identify the correct leads.
If windings are shorted, the motor must be replaced.
Problem:
Actuator operation is stiff, seems to be binding.
Solution:
Check for dents on the body tube, motor end bell, and dam
-
age to the square rod. If there are signs of visible damage, the actuator
or motor or both may need to be replaced. Dents on the motor shaft or
endbells may cause the rotor to seize or rub, producing binding and stiff
operation. While the nut of the OLE actuator is self-lubricating, rod lubri
-
cations is recommended at regular intervals. Use Bimba HT-99 grease.
Problem:
Can I use switches with my OLE for end of stroke sensing?
Solution:
All OLE actuators have magnetic pistons. OLE actuators can
use the same switches as Original Line pneumatic cylinders. Refer to the
Bimba catalog for switch recommendations.
Problem:
The motor gets hot.
Solution:
Step motors tend to run hot (the actual maximum case tem
-
perature is 80° C). However, the motor should not get too hot to touch.
If it is overheating, the drive current may be set too high. All standard
OLE step motors are 8-wire motors. Refer to Table 3 in this manual for
required drive current levels. Also consider duty cycle; reduce either the
running current, idle current, or duty cycle. Instructions for adjusting idle
and running current are provided in section 3.e.
Problem:
The motor is not producing enough torque or it stalls at low
speeds.
Solution:
If the motor previously ran well, check the resistance of the
windings. Use an Ohmmeter to measure the resistance between differ
-
ent windings (should be infinite) and between the leads of each winding
(should be the same for each winding). Use your motor’s wiring diagram
to identify the correct leads. If windings are shorted, the motor must be
replaced.
If lack of torque is observed at the initial start up with a load and desired
speeds are not reached, check connections between the motor and drive
and check drive settings.
