Plan- x1 meeting no. 4 –27/04/10 at NCRA Auditorium, Pune

GMRT SERVO SYSTEM PLAN X1 TARGET implements :

1a) Brushless drives1b) PC-104 Servo computer

1c) Generic antenna Controller unit (GACB)1d) Solid state interface logic– SSI

1e) Feed position system – 6U04/19/23 1dec 2008

04/19/23 dec 2008 2

Brushless drive … work planned for 2k8-9

04/19/23 dec 2008 3

• One antenna system testing with test setup (simulating the actual dual drive of either azimuth or elevation axis) in progress in LAB.

…..Completed in MTAC period 2010 both in: a) position loop mode b) Velocity loop mode. Overall position accuracy matches with the test report of

Leopold •

• Installation and commissioning on antenna by end 2008

…….Documentation / computation of test plots/results in progress to arrive at performance parameters like a) bandwidth b) resonant frequency• Two more antenna systems procurement, testing and installation by March 2009……. Purchase order placed in feb 2010 for 4 more systems

Brushless drive … work planned for 2k10-11

• Test Large test setup by interfacing SSC to BLDC and later with PC-104

• On successful completion of the above, test antenna - C04 with BLDC + PC-104

• Leave the unit at C04 for Observation and feedback from Engineering group / GTAC users.

• Assemble one antenna bldc system in a 19” rack for minimising RFI emanating from the drives.

• Test / Measure the RFI after the rack is assembled and submit for acceptance and approval for mass production

Block Diagram ….BLC configured in position loop

Position Error in arcsec with i522=0.1cts/ms pr 6.66 rpm

-3

-2.5

-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

2.5

0 1 2 3 4 5 6 7 8 9 10

Time(Sec)

Po

siti

on

Err

or

in a

rcse

c

Posn.error = +/- 1.6sec

Block Diagram ….BLC configured in velocity loop

Summary of load velocities for different scale factors in Algorithm

Analog i/p – to ADC

Velocitycmd.Scale factor

Load vel.In cnts/sec

Load vel. In deg/min

RemarksVelocity error

10 V 5 350 2

10 V 63 4500 30 +/- 0.02 ‘sec/s

10 V 100 7500 50

LoadVelocity (deg/min) with ADC=10V(10V=32767cts or 2200 rpm) and Cmdvel Scaling factor(P9)=63

-40

-20

0

20

40

60

80

100

0 0.2 0.4 0.6 0.8 1 1.2 1.4

Time(sec)

Lo

adve

loci

ty(d

eg/m

in)

Velocity Error in arcsec/sec with P9=63 and ADC=10V

25.11

25.112

25.114

25.116

25.118

25.12

25.122

25.124

25.126

0 0.2 0.4 0.6 0.8 1 1.2 1.4

Time(sec)

Velo

city

Err

or in

arc

sec/

sec

Gear box being hauled up to the setup

04/19/23 12dec 2008

Generic Antenna Board Functional Block Diagram

PC104 Master PC104 Slave104 lines in

Parallel

Addr/data busbuffers

Addr/data busbuffers

CPLD 2

CPLD 1

AIPsection

DIP section

Encoder Interface

AOPsection

DOP section

SPIInterface

QUADUART

CANcontroller

K/B,mouse

VGA USB

TCP/IP

3 x RS232

RS422/RS485

BLDC Drives

PMDC Drives

Field Sig.

FieldSig.

FieldSig.

Sensors

Front Front PanelPanel

(Maintena(Maintenance)nce)

RS232

Add. lines Data lines

Generic Antenna Controller – GAC plan status and projections – 2k10-11

• 1. Generic Antenna Controller Board FY 2009-10 : Work done : • Specification on a new integrated Generic antenna Controller board is

finalisedthis year and a detailed design exercise was undertaken in active collaboration with BARC's Control and Instrumentation division.• The design has been completed and frozen.

• PCB layout work with a vendor is in progress currently. It is expected to finalize the layout work by Sept 2010.

• The boards are expected to be populated by Oct 2010 and tests would start in

Oct2010. Antenna tryouts are likely by the end of this financial year.

04/19/23 dec 2008 14

Solid State Interlocks – SSI plan status and projections – 2k10-11

• FY 2009-10 : Work Done :

• --- SSI systems were installed on ----- antennas in this financial• years, taking number of antenna with SSI to 22 including 1 prototype • board. In addition, work was undertaken to get fresh PCBs ready for• 10 antennnas and the population of these PCBs is in progress. It is• expected to get 10 systems ready and tested in the coming financial• year and install at least 08 systems on antennas, subject to availabilty• of antennas during GTAC cycle.

04/19/23 dec 2008 15

PC-104 • FY 2009-10 : works planned / done

• Development of Graphic user Interface – GUI developed for monitoring, data logging from antenna base.

• Make RFI measurements and Cabinet vendor identification in progress

• Performance checks after installation for one GTAC cycle

compensator extensively tested at C02, Antenna test plan report generated to validate the code during the antenna installation,added a state machine “calibrate”

04/19/23 dec 2008 16

Pc-104 works planned 2k10-11

• Extensive testing from CEB thro’ ABC• Performance evaluation of pc-104 during

GTAC observation….2 weeks• Interfacing with BLDC at Rayshed/JOgshed

with simulated load• Actual interface with BLDC at antenna base

and control from CEB• Make RFI enclosure

Budget Utilisation in Lakhs(Rs) & proposed

Activity Plan 2k9-10 Actual Plan 2k QTY

10-11 Rs Lacs

BLDC 5 ants(150.00)

4 ants(145.78)

6 # ( 250.00 )

PC-104 &GACB

30 & 5 ants( 25.00)

Prototype( 2.04)

10 # 5 # ( 30.00 )

BL Drive ( indig) --------- ----------- 2 nos ( 20.00)

Lab eqp . (10.00) ( 4.70)

Fps – 6U &Angle enc.

10ants &5#( 10.00 )

10ants ( 6.90)

10 ants5 #

( 10.00 )

SSI 15 ants 22ants( 2.00 )

08 ants ( 2.00)

Lightning protection

---------- 01 ant(4.00 )

------ NIL

DC ServoMotor magnet

5 nos ( 10.00 )

--------- 5 # ( 10.00 )

Thank you 04/19/23 April 2010 19