Andrew OMACS3000 11-APR-06 Rev E OMACS3000 , 8 of 51, Dual VFD Motor Drive Card (MD-3) , Resolver To Digital Converter Card (RES-2) , Low Temperature Board

11-APR-06 Rev E OMACS3000

System Description

DS-5 STOP Illuminates steady YELLOW when the Emergency Stop Switch is depressed.

DS-6 MICRO RESET Illuminates steady RED when MPU-17 microprocessor is in a reset condition. Blinks

RED in a continuous reset condition or buss failure.

DS-7 POWER Illuminates steady GREEN when MC-2 is receiving +/-12 VDC

The Dual VFD Motor Drive Card (center card) handles control, status and fault reporting of the a zimuth and

elevation Variable Frequency Drive Units (VFD's). The Dual VFD Motor Drive Card has two f ault indicators.

The MD-3 provides the following fault indicators that are viewable from the face of the card:

DS-1 OVERLOAD Illuminates Steady RED when AZ, EL, or both AZ and EL axis motor s are drawing

excessive current. A slow RED blink (500ms) indicates loss of communication with

the MPU-17.

DS-2 FAULT Illuminates RED when either VFD is in a fault condition. A slow RED blink (500 ms)

indicates loss of communication with the MPU-17. A fast RED blink (250 ms)

indicates both forward and reverse VFD direction commands are present

simultaneously.

The Resolver To Digital (R/D) Converter Card (right most card) is a multiplexed single converter based card

and provides resolver signal to digital bit converter. The RES-2 card accepts three resolver inputs an d

outputs the 16 bit converted value of each resolver signal to the MPU-17.

The RES-2 provides the following indicators:

DS-1 EL CEN Illuminates steady YELLOW when the EL resolver is reading center of the R/D

range (±2 degrees). A slow YELLOW blink (500 ms) indicates a loss of

communication with the MPU17. A fast (250 ms) blink indicates a loss of resolver

signal and would likely be caused by the EL resolver not being properly connected

or defective.

DS-2 AZ CEN Illuminates steady YELLOW when the AZ resolver is reading center of the R/D

range (±2 degrees). A slow YELLOW blink (500 ms) indicates a loss of

communication with the MPU17. A fast (250 ms) blink indicates a loss of resolver

signal and would likely be caused by the AZ resolver not being properly connected

or defective.

DS-3 POL CEN Illuminates steady YELLOW when the POL resolver is reading center of the R/D

range (±2 degrees). A slow YELLOW blink (500 ms) indicates a loss of

communication with the MPU17. A fast (250 ms) blink indicates a loss of resolver

signal and would likely be caused by the POL resolver not being properly connected

or defective.

The low temperature board has the following indicators:

DS1 (Yellow) High Temperature. The temperature inside the enclosure is above +50° Celsius.

DS2 (Red) Low Temperature. The temperature inside the enclosure is at 0° Celsius. A warning

is issued. If the temperature fall below -10° Celsius power is removed from the

VFDs and all antenna movement halted. The temperature must rise above -10°

Celsius before power is restored to the VFDs.

DS3 (Green) Power to the low temperature board is within normal limits.