Specifications

Doc Number: VIS-ANA-VER-01001-9002

Date: 27 May 2004

Issue: 5.0

Page: 58 of 80

Author: J. Delgadillo

Controls Preliminary Design Report Issue 5.doc

Pre-Interlock Limit - Fault is reported to the MCU and LCU-fed contacts open. Axis motors

are disabled. The Limit Override momentary switch (inside the appropriate Power Drive

Unit) needs to be continuously depressed until the limit clears.

Interlock Limit - Fault is reported to the MCU and LCU-fed contacts open. Interlock chain is

broken which causes removal of utility power (3-phase power (AZ/ALT) or 1-phase power

(CASS)) to the axis motor controllers. Recovery of the Interlock Limit can only be done by

manually (physically) moving the structure and clearing the Interlock Limit.

AD01 11.1.8.2 states "In maintenance mode it shall be possible to drive all axes to the

Interlock limits under local engineering control at a reduced slew rate to verify the correct

functioning of the Interlock system". VertexRSI will not comply with this requirement as it

could result in a potential safety hazard. The control system hardware will not allow driving

past the Pre-Vicinity Limits. Of course during the commissioning/testing of the system,

temporary bypassing of travel limits are allowed/necessary in order for the activation of the

2nd and 3rd level of travel limit protection.

4.2.5.16 Anemometers

Three anemometers will be provided which will interface directly with the M1 Mirror

Support LCU. As recommended, the anemometers are manufactured by GILL Instruments

Ltd (AD01 6.4.4 spec). The manufacturer part number is 1086-PK-046. The recommended

units don’t come with RS485 interface, but will be provided with their standard RS-422 serial

interface. The power requirement for the anemometers will come directly from the LCU,

shown on Table 4.2.5.16, and is as follows: 9 to 30 Vdc, 120mA max.

TABLE 4.2.5.16 - M1 Mirror Support LCU Interfaces

SIGNAL

SIGNAL NAME SIGNAL TYPE

ANEMOMETER (AD06 3.3 spec)

1 Anemometer #1 RS-422 + Power

2 Anemometer #2 RS-422 + Power

3 Anemometer #3 RS-422 + Power