TROUBLESHOOTING
72 IPA Hardware Installation Guide
Hall Sensors
The troubleshooting procedures in this section assume that a terminal emulator connection is established with the
IPA. The procedures assist you in resolving a Hall fault (ERROR bit E37-Bad Hall State). Several problems can
cause a Hall fault; the following checklist will help identify these problems.
Troubleshooting Checklist
1 Does THALL report either 0 or 7?
If yes, see Problem 1 or Problem 2, below.
2 Does THALL change if you move the motor by hand?
If no, see Problem 2, below.
3 Does THALL have six distinct Hall states from 1 to 6? (No numerical order is necessary.)
If no, see Problem 2, below.
4 Does THALL report the six distinct Hall states n times as the rotor turns one revolution, where n is
equal to the number of pole-pairs (DPOLE)? (Linear motors: n = pitch)
If no, see Problem 2 or Problem 3, below.
5 Does THALL report the Hall state sequence [1, 5, 4, 6, 2, 3, 1...] as the motor turns clockwise?
(Clockwise means TPE is increasing when Bit 8455 set to zero (Ø); it is also the direction the motor
turns in DMODE1.)
If no, see Problem 4, below.
6 Does DRERROR report a Hall fault each time the drive is enabled (DRIVEON AXIS0), even though the
Hall state sequence is correct?
If yes, see Problem 4, below.
7 Does the Hall fault occur irregularly?
If yes, see Problem 6, below.
Possible Problems
Problem 1
No Hall states are seen by the drive/controller.
Problem 2
The cable is not connected, or is connected incorrectly (incorrectly wired).
Problem 3
Motor pole pairs or the pitch distance (for linear servo motors) is not set correctly.
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