Chapter 5 – Troubleshooting
47
System Problems
If your Gemini drive is functioning properly, other parts of your system may be
causing problems. It may be difficult to identify where the problem is coming
from. To diagnose system problems, we recommend that you first have the drive
perform its autorun function. Then check the other topics in this section.
Using Autorun Mode to Isolate Problems
In autorun mode, the motor runs open loop—the Gemini drive generates its own
internal control signal, and commands the motor to turn clockwise at 1 rps.
Follow these steps to put the drive in autorun mode, which will verify that the
drive is functioning properly, and is not the source of the problem.
1.
Disconnect the controller from the drive. Disconnect the load from the motor.
2.
Perform these procedures from
Chapter 2 Installation:
• Connect the Motor (power and feedback)
• Connect AC Power
• Configure the Drive
The final step in “Configure the Drive” is issuing a DMODE13 command, which
configures the drive for autorun.
3.
Enable the drive by connecting Pin 1 to Pin 2 on the drive’s 50 pin DRIVE I/O
connector. NOTE: connecting pin 1 to pin 2 may require that you use a breakout
module, such as Compumotor’s GEM-VM50.
4.
Apply AC power.
5.
The motor should begin turning clockwise at one revolution per second.
Successful completion of the autorun test indicates that AC power and motor
cables are connected correctly, and that the drive is functioning properly. Check
the topics below for other sources of problems.
AC Power
Verify that your AC power mains deliver adequate power to the drive’s AC power
input.
Motor Problems
Verify that the drive is configured properly for the motor you are using. The motor
series, frame size, and part number information on a Compumotor motor’s name
plate should match the settings stored in the drive’s memory.
Mechanical System
Shaft Coupler
Verify that the shaft coupler is not slipping during acceleration or deceleration. We
recommend bellows or disk style couplers for servo applications. Helical couplers
are inadequate, and are not recommended.
Mechanical Transmission
Verify that your mechanical system functions properly, and is not jammed.
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