Rockwell Automation LC-Series Linear Motor - Manual (Page 33)

Item Number 814036 - Rev C
Troubleshooting 3-3
Basic Motor Checks -
Electrical
Coil Resistance Measurements - Ohmmeter
After installation is completed and before running for the first time, this
procedure should be performed to ensure no damage occurred during
installation. Also, perform this check whenever a coil electrical problem is
suspected.
• Coil at room temperature (approximately 25 o
C.)
• Drive power OFF.
• Ensure all motor leads (phases and ground) are disconnected from the
drive.
• Refering to Figure 3.1 Measure the phase to phase (ptp) resistance of the
three phase combinations and record the values. The three readings
should be approximately equal to each other.
Figure 3.1 Motor Coil
• Measure the phase to ground resistance for each phase. The resistance
to ground should be in excess of 100 megohms. A lower reading may
indicate an electrical problem. Disconnect the field cable at the coil
assembly interface and repeat procedure. If any reading is still below 100
megohms, consult Anorad, as the motor may have an internal electrical
problem.
ATTENTION
!
Dangerous voltages, forces and energy levels exist in servo
controlled systems. Extreme care must be exercised when
operating, maintaining or servicing the linear motor to
prevent harm to personnel or equipment
R
ptn
R
ptp
Motor Phases
Motor Ground
R
ptp
=R
ptn
X 2
Lamination
Frame
Shield