Plan- x1 meeting no. 4 –
27/04/10 at NCRA Auditorium, Pune
GMRT SERVO SYSTEM PLAN X1 TARGET
implements :
1a) Brushless drives
1b) PC-104 Servo computer
1c) Generic antenna Controller unit (GACB)
1d) Solid state interface logic– SSI
1e) Feed position system – 6U
3/15/2016
dec 2008
1
3/15/2016
dec 2008
2
Brushless drive … work planned for
2k8-9
• 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
3/15/2016
•
dec 2008
3
• 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 + PC104
• 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
2.5
2
1.5
Position Error in arcsec
1
0.5
0
0
1
2
3
4
5
6
-0.5
-1
-1.5
-2
Posn.error = +/- 1.6sec
-2.5
-3
Time(Sec)
7
8
9
10
Block Diagram ….BLC configured in velocity loop
Summary of load velocities for different scale factors in Algorithm
Analog
i/p – to
ADC
Load vel.
In
cnts/sec
350
Load vel.
In
deg/min
10 V
Velocity
cmd.Scale
factor
5
10 V
63
4500
30
10 V
100
7500
50
Remarks
Velocity
error
2
+/- 0.02
‘sec/s
LoadVelocity (deg/min) with ADC=10V(10V=32767cts or 2200 rpm) and Cmdvel Scaling
factor(P9)=63
100
80
Loadvelocity(deg/min)
60
40
20
0
0
0.2
0.4
0.6
0.8
-20
-40
Time(sec)
1
1.2
1.4
Velocity Error in arcsec/sec with P9=63 and ADC=10V
25.126
25.124
Velocity Error in arcsec/sec
25.122
25.12
25.118
25.116
25.114
25.112
25.11
0
0.2
0.4
0.6
0.8
Time(sec)
1
1.2
1.4
Gear box being hauled up to the setup
3/15/2016
dec 2008
12
Generic Antenna Board
Functional Block Diagram
Encoder
Interface
CPLD 2
QUAD
UART
Addr/data bus
buffers
SPI
Interface
3 x RS232
RS422/RS485
Sensors
K/B,mouse
Front Panel
(Maintenance)
VGA
USB
RS232
PC104
Master
104 lines in
Parallel
PC104 Slave
TCP/IP
Addr/data bus
buffers
Field
Sig.
Field
Sig.
AIP
section
DIP
section
CPLD 1
CAN
controller
BLDC Drives
AOP
section
PMDC Drives
DOP
section
Field Sig.
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.
3/15/2016
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.
3/15/2016
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”
3/15/2016
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 ants
5#
( 10.00 )
SSI
15 ants
22ants
( 2.00 )
08 ants
( 2.00)
Lightning
protection
----------
01 ant
(4.00 )
------
DC Servo
Motor magnet
5 nos
( 10.00 )
---------
5#
NIL
( 10.00 )
3/15/2016
Thank you
April 2010
19