HP StorageWorks 1000 - Modular Smart Array Operating instructions

HP 6002A
Power Supply HP 1000
Computer
HEWLETT' PACKARD
Programming Guide
Device Introduction
The HP 6002A DC Power Supply1 employs a unique ex-
tended range technique which allows it to furnish maximum
output power over a wide range of voltage
and current com-
binations. The supply can provide a full 200 watts of output
from 20V, 10A to 50V,
4A. The output is fully adjustable
through the enti re operating range of +0 to +50 volts and 0
to 10 amps by front-panel voltage and current controls.
Option 001, the HP-IB interface allows the supply
to be
digitally controlled from a calculator, computer, or other con-
troller. Either the output voltage or current can be
programmed.
A pair of switches on the rear panel of the supply allows
selection of anyoneof three modes of operation: local, HP-IB
constant voltage (CV), or HP-IB constant current (CC). The
6002A acts only as a listener on the bus.
Addressing
Before the 6002A can accept programming information, it
must
be addressed to listen. The 6002A has listener capabil-
ity only. The switches which allow the 6002A to be addressed
as a listener are located on the rear panel. They are in the
upper right hand-corner of the box, just to the right of the
HP-IB connector.
There are seven switches, but only the left five are used.
Note that the 6002A address cannot
be read directly off ofthe
rear panel
in binary. The least significant bit is farthest to the
left as shown in figure 9-1. The octal address shown is 5.
Constant voltage (CV) or constant current (CC) operation
must also
be set (also shown in figure 9-1). The HP-IB option
001 circuits are factory adjusted for CV operation2. See the
"Programming" section for more details.
1 The 6002A Operating and Service Manual (06002-90001), the
HP-IB Power Supply Interface Guide (5952-3990), and Application
Note 401-1 (5953-2800) should
be used with this note.
2Constant current
(GG) adjustments are also discussed in Appendix
A of the 6002A Operating and Service Manual (06002-90001).
Application Note 401-9
System Preparations
LU Assignment
One logical unit should be assigned to the 6002A. Assuming
the switches are set to
an address of 5 as shown in figure 9-1,
the LU assignment may be performed from File Manager,
:SYLU,17,10,S8
This statement would assign LU 17 to equipment table 10.
The device address associated with LU 17 would be 5.
ADDRESS SWITCH
1 -7
~
IGNORED
DD
Figure 9-1. 6002A Listen Address and Mode Switches

HP 6002A/HP 1000
Buffering
The buffering option for the 6002A EQT should be turned off
until the device has been tested for valid operation.
:SYEQ,10,UN
will set the 6002A EQT to the unbuffered mode.
Although the time-out for the 6002A EQT must be a com-
promise for all devices on the HP-IB, the 6002A time-out can
be as short as one second. The time-out is an errorcondition
for this device.
The 6002A either listens
and accepts programming informa-
tion, or an error condition exists (the 6002A hardware is
inoperative). For this reason, it
is usually satisfactory to allow
the operating system to handle time-out errors. (The device
configuration word defaults to this condition.) From File Man-
ager, a system request may be used to set the time-out
value:
:SYTO,10,100
will set the time-out on EQT 10 to one second.
Configuration
The 6002A is a device which will need special configuration
on HP-IB. Four ASCII characters are expected
by the power
supply. These characters do not include an end-of-record
terminator. (The carriage return (CR), linefeed (LF) ter-
minator will confuse the 6002A.) When an ASCII write re-
quest (a formatted "WRITE" from FORTRAN, for example) is
performed in the HP 1000, a CRLF is automatically sent as
the record terminator.
By inserting the underline character
C'_ ") at the end of each output record, the end-of-record
terminators may
be suppressed. This method must be used
each time a write request
is made to the 6002A. See the
example FORTRAN program in figure 9-4 for more details.
SRQ is not applicable to the 6002A. The default SRQ config-
uration is satisfactory.
DMA
is not usually allocated for the 6002A so the device
configuration word should
be checked to see that a DMA
channel is not inadvertantly allocated.
The I,J, and P bits of the configuration word are not applica-
ble to the 6002A, and may
be left at their default values.
9-2
From File Manager,
:CN,17,25E,17000E
"
will assure that LU 17 (the 6002A) is configured correctly.
Remote
The 6002A need not be configured into remote for
programming.
Programming
Because record terminators are not accepted, File Manager
should not be used to check out the power supply.
The HP-IB option (001) is basically adigital-to-analog conver-
ter (DAC) that voltage-programs the power supply's constant
voltage (CV) or constant current (CC) output in the high or
low range. The DAC automatically provides a voltage-
programming output to the power supply as soon as four
digits are received. This output is retained until the next four
digits are received. The DAC
is programmed by the mag- ,---../'
nitude digits in BCD in such a way that 000 equal 00.0% of
full range, 500 equals 50.0% of full range, and 999 equals
99.9% of full range.
The magnitude of the constant voltage (CV) or constant
current (CC) output of the power supply
is programmed by a
data word comprised of four ASCII characters (digits) re-
ceived in the order shown by figure 9-2. The first digit
specifies range and the next three digits specify the desired
magnitude (percentage of full scale).
01
I
Range
1 or 2
02 03
04
~~-------'r~------_/
Magnitude
000-999
Figure 9-2. 6002A Data Word Format

0001
0002
0003
0004
0005
0006
0007
0008
0009
0010
0011
0012
0013
0014
0015
0016
0017
0018
0019
0020
0021
0022
0023
0024
0025
0026
0027
0028
0029
0030
0031
0032
0033
0034
0035
0036
0037
0038
0039
0040
0041
0042
0043
II I
HP 6002A/HP 1000
FTN4,L
PROGRAM TVOUT(3),11-28-78 (GWG) TEST VOUT
C
C
C
INTEGER VOUT
COMMON ILU,ILST,IDLU
DATA NO/2HNO/,BUS/2HBUI
IF(INPRM(ID).EQ.NO)GO TO 998
6 WR ITE( ILU, 1 0)
10 FORMAT("ENTER: REAL 'VOLTS'
READ(ILU,)VOLTS
998
15
999
IF(VOLTS.GT.50.)GO TO 999
IF(VOUT(VOLTS).EQ.NO) GO TO 999
GO TO 6
WRITE(ILU,15)
FORMAT( ": RU , TVOUT , I LST , IDLU")
STOP
END
Input parameters saved here.
Obtain input parameters.
50 MEANS END: _")
Read input voltage value from the user
terminal.
If voltage is illegal, terminate the program.
Call function to program the 6002A.
INTEGER FUNCTION VOUT(VOLTS),11-07-78 (GWG) VOLTS TO 6002A
C
C USER PROGRAM ERROR CHECKING MUST BE USED WITH THIS
C FUNCTION CALL, NO BUFFERING, ERRORS ARE CHECKED BY
C THE FUNCTI ON.
C
C OUT OF RANGE ERROR = -1
C
INTEGER
REAL
COMMON
DATA
RANGE,OUTV
RESOLU,VOLTS
ILU, ILST, IDLU
NO/2HNO/,YES/2HYEI
VOUT=YES
IF(VOLTS.LT.O)GO TO 300
50 IF(VOLTS.GE.10.)GO
TO 100
RESOLU=.01
RANGE=1000
GO TO 200
100 IF(VOLTS.GE.50.)GO
TO 300
RESOLU=.05
RANGE=2000
200 OUTV= VOLTS/RESOLU +.05 + RANGE
WRITE(IDLU,10)OUTV
10 F ORMAHI4,1_")
Appendix A of the 6002A Operating and
Service Manual describes range program-
ming in detail.
Note, the underline character must be used
to suppress the carriage return and linefeed.
Figure 9-4. Programming 6002A Voltages
9-3

.,
HP 6002A/HP 1000
0044 1ERORV=1BERRC1DLU)
0045 1FC1ERORV.EQ.O) RETURN
0046 WR1TEC1LU,1000)1ERORV
0047 1000 FORMATC"HP-1B ERROR .. 13 ..... )
0048
VOUT=NO
0049 RETURN
0050 300 WR1TEC1LU,1001)
0051 1001 FORMAH"6002A
VOLTAGE OUT OF RANGE .")
0052 RETURN
0053 END
Figure 9·4. Programming 6002A Voltages (Continued)
The range digit can be the number 1 specifying low range
(0-10 volts for CV, 0-2A for CC) or the number 2 specifying
high range (0-50 volts for
CV, 0-10 amps for CC). The mag-
nitude digits can
be any number from 0-999 (see figure 9-3).
Since 999 is the maximum value for the magnitude digits, the
programmable output ranges are as shown in figure 9-3.
Figure
9-4 shows a FORTRAN test program and a
generalized subroutine which allows the 6002A to be pro-
grammed from 0-49.9 volts by inputting the desired voltage
value from a user terminal. The equations required to do the
operation are straight forward and can
be found in the sub-
routine.3 Range programming for the CC operation can
be
done in a similiar fashion.
The following paragraphs provide detailed operating instruc-
tions required to program the 6002A for constant voltage or
constant current operation. Refer to figures 9-5 and 9-6 for
adjustments and component locations respectively.
Low Range CV - 0 to 9.99V (99.9% of 10V)
High Range CV - 0 to 49.95V (99.9% of 50V)
Low Range CC - 0 to 1.998A (99.9% of 2A)
High Range CC - 0 to 9.99A (99.9% of 10A)
Figure 9·3. 6002A Programmable Output Ranges
3 See the 6002A Operating and Service Manual, Appendix A for
more information conceming range programming.
9·4
Constant Voltage Operation
To program the supply for constant voltage operation:
a. Connect the supply to an HP 1000 controller.
b. Set the mode switches on the rear of supply to the CV ' ''--./
position,
c. Turn on the supply.
d. With the supply's output terminals open, program the
supply for the desired output voltage.
e. Connect a short across the supply's rear panel output
terminals and adjust the front panel current control for
the desired maximum output current.
If a load change
causes this current limit
to be exceeded, the supply
automatically crosses over to constant current operation
at this preset current limit and the output voltage drops
proportionally.
Constant Current Operation
To program the supply for constant current operation, you
must first adjust HP-IB option
001 for CC operation (steps a
through
h).
a, Turn off the supply and set mode switches to the CC
position.
b. Turn the VOLTAGE control on the front panel fully
clockwise.

III
c. Use the constant current test setup (fiQure 9-5) except
set RL1 and RL2 to approximately 3.5 ohms each and
use a
0.01 ohm resistor for current sampling resistor RS.
d. Connect the power supply to the HP 1000 and turn
it on.
Allow a 30-minute warm up period.
e. Adjust constant current (CC) zero output by connecting
an oscilloscope to the +S and -S terminals and repeat-
ing one and two below.
f.
g.
h.
i.
j.
k.
I.
1. Alternately program data words 2000 (zero high
range) and 1000 (zero low range) with a 50msec
(approx.) delay between data words. Programming
these words consecutively in FORTRAN is close
enough. If this is a problem, use a "DO" loop be-
tween programming statements.
2. Adjust the ZERO ADJUST potentiometer
(A300R19) and the ZERO BALANCE ADJUST
potentiometer (A300R4) for a straight line at zero as
indicated on the scope. Potentiometers are adjusted
simultaneously to obtain the desired scope
indication.
Adjust
CC high range full scale outPl:lt by programming
data word 2999 and adjusting A300R7 for a reading of
.0999V on a digital voltmeter (connected across R(S) as
shown
in figure 9-5).
Adjust
CC low range full scale output by programming
data word 1999 and adjusting A300R9 for a reading of
.01998V on a digital voltmeter (connected across R(S)).
Recheck adjustments. If necessary, repeat steps e
through g above.
Turn off the supply and connect a short across the rear
output terminals.
Set the mode switches to CC and turn on the supply.
Program the supply for the desired output current.
Open the output terminals and adjust the front panel
VOLTAGE control for the desired maximum output vol-
tage. If a load change causes the voltage limit to be
exceeded, the supply automatically crosses overto con-
stant voltage operation at this
pOint voltage limit and the
output current drops proportionally.
9-5
HP 6002A/HP 1000
51
" 0--
POWER SUPPLY
RL1
UNDER TE ST
yI':-
-+
~
vt_
~L2
DIGITAL
VOLTMETER
LOAD RESISTORS + - G
CURRENT
~
MONITOR ING
RES ISTOR ...().
{RS ~
Figure 9-5. 6002A Constant Current Test Setup
Performance
The 6002A is a listener-only on the HP-IB and is designed to
be a programmable power supplywith a versatile voltage and
current and output range. Hence, its prime applications are
found
in the testing of electronic components and in supply-
ing stimulus to various process control equipment. Actual
performance testing would be more applicable to high speed,
low current applications (i e., ADC's used for waveform gen-
eration). If empirical measurements are desired, however,
refer to the performance programs discussed in Chapter 5 of
Application Note 401-1.
In actual applications of the 6002A, a stimulus is applied, and
a response is expected
or measured. The time between
requesting the stimulus and the expected response is often
useful information to the system programmer.
The 6002A will respond
in less than 100 milliseconds when
programmed from 0 to 99.9%
of maximum rated output ~Ol
tage. This response is independent of load. For programming
the supply down (100% to 0.1 % of maximum rated output),
the output takes approximately 400 milliseconds without any
load and approximately 200 milliseconds with a full load. The
slower time to program down is due to the supply's output
capaCitor which discharges much more slowly without a load
than with a load.

HP 6002A/HP 1000
SPAN R ----1~--
DAC OUT - ___ 1----'
RANGE --+-- -
U28 -1 3 --+-----'
R--+-:--
VDD-
-15V- -+-= -- --'
W • .-/'
+15V ~
I'5V'\;7
I
I
TURN ON/OFF
~
6 -
8
9
-,
Tl
I 3
I
11
I . 12
I
i-C;~----O--~l~'- -
I CR .
I CA3
I CR4
I p/o
I +5V REGJL=
I SUPPLY
-------- - --
C]B=
~i!s 88
± 15V REGULATED SUPPLY
Figure 9-6. Component Adjustment Locations
9-6

1m
HP 6002A/HP 1000
NOTES
9-7

II
HEWLETT if PACKARD
5953-2808(22) Printed
in U.S.A. 4/79