Chapter 4 – Special Features
47
Method 2 – Finding an Unknown Offset Angle
Use this method if you do not know your resolver’s offset angle.
1.
Disconnect the load from the motor shaft. The shaft should be free to rotate.
2.
Verify correct motor wiring. See the
Gemini Motor Reference Manual for wiring
information for Compumotor motors.
3.
Configure the drive for your motor, as described in
Chapter 2 Installation. If you use
a non-Compumotor motor, create and download a motor configuration file for your
motor.
4.
Enable the drive.
5.
Issue a DMODE13 command to put the drive into autorun mode. The motor should
begin turning clockwise at approximately 1 rps, as viewed from the shaft end of the
motor. If the motor turns in the wrong direction or at the wrong speed, check the
motor wiring, and verify correct motor pole configuration (DPOLE command).
6.
Issue a DMODE11 command to put the drive into alignment mode. The motor will
stop turning.
7.
Issue an SRSET command. The motor may turn as much as 1/2 revolution. It will
stop when the motor magnetic poles align.
8.
Disable the drive. Upon being disabled, the drive stores the value for the offset
angle into nonvolatile memory. It uses this value for all future operations. You do
not need to perform this procedure again.
9.
Return the drive to the appropriate mode of operation (DMODE command).
Method 3 – Rotating the Resolver Housing
Use this method to manually rotate the resolver to a specific offset angle (usually zero
degrees).
1.
Disconnect the load from the motor shaft. The shaft should be free to rotate.
2.
Verify correct motor wiring. See the
Gemini Motor Reference Manual for wiring
information for Compumotor motors.
3.
Configure the drive for your motor, as described in
Chapter 2 Installation. If you use
a non-Compumotor motor, create and download a motor configuration file for your
motor.
4.
Enable the drive.
5.
Issue a DMODE13 command to put the drive into autorun mode. The motor should
begin turning clockwise at approximately 1 rps, as viewed from the shaft end of the
motor. If the motor turns in the wrong direction or at the wrong speed, check the
motor wiring, and verify correct motor pole configuration (DPOLE command).
6.
Issue a DMODE11 command to put the drive into alignment mode. The motor will
stop turning.
7.
Issue an SRSET command. The motor may turn as much as 1/2 revolution. It will
stop when the motor magnetic poles align.
8.
Loosen the cleats that hold the resolver housing onto the motor.
9.
Issue a TSROFF command repeatedly as you slowly turn the resolver housing. The
TSROFF command indicates the present resolver offset angle.
10. Turn the resolver housing until the offset angle is zero degrees (or until you obtain
your desired offset angle).
11. Tighten the cleats.
12. Disable the drive. Upon being disabled, the drive stores the value for the offset
angle into nonvolatile memory. It uses this value for all future operations. You do
not need to perform this procedure again.
13. Return the drive to the appropriate mode of operation (DMODE command).
