User`s guide

Gyro Control Unit (GCU)

User’s Guide

MaxMetrix, Scottsdale, AZ

PN: GCU-2K1-UG:RevI.2 NGC

6 FAQ AND TECHNICAL SUPPORT

The section presents some of the possible remedies to different issues that may occur while exercising the

unit with the gyro setup application.

6.1 GYRO SETUP SOFTWARE DOES NOT RESPOND TO COMMANDS

• Try to disconnect and then reconnect the USB service using the CONNECT button in the Gyro

Setup application.

• Try to reboot the Windows PC, then restarting the Gyro Setup application

6.2 G-2000 GYRO IS UNSTABLE AFTER POWER IS APPLIED

This can occur if the wrong parameters are loaded in the GCU flash memory.

• Power the unit on.

• Connect to the GCU with the Gyro Setup application and send a MOTOR OFF command. This

will turn off the spin motor and torquer outputs.

• Load the default parameter file, using the SET DAFAULT VALUES button.

• Send to defaults to the GCU DSP using the “SEND TO DSP” button

• Turn on the spin motor and send a TORQUER ON command. If the gyro is stable and caged, then

use the SAVE CALIBRATION button to write the parameters to the Flash memory in the GCU.

• Re-Tune the Gyro parameters, and then SAVE CALIBRATION to write the new parameters to

Flash.

CAUTION!!! CAUTION!!! CAUTION!!!

If the gyro is unstable after power is applied the GCU and Gyro will get very hot due to excessive torque

being applied by the controller. It is very important to turn off the spin motor as soon as possible to prevent

over the GCU and Gyro from over heating.

CAUTION!!! CAUTION!!! CAUTION!!!

6.3 GYRO NOT CAGING

• Check to see if the DSP control law active LED is illuminated (lights ~3sec after power is

applied), if not, download the DSP code using the firmware loader.

If the gyro is unstable after power on the GCU and Gyro will get very hot due to excessive torque being

applied b the controller. It is very important to turn off the spin motor as soon as possible to prevent over

heating of the unit.