Elgar CW 801P Owner's manual

CW-P SERIES
PROGRAMMABLE
AC POWER SOURCE
Programming Manual
This manual covers models:
CW 801P
CW 1251P
CW 2501P
ELGAR ELECTRONICS CORPORATION
9250 Brown Deer Road
San Diego, CA 92121-2294
1-800-733-5427
Tel: [phone]
Fax: [phone]
Email: [email protected]
www.elgar.com
©2003 by Elgar Electronics Corporation
This document contains information proprietary to Elgar Electronics Corporation. The information contained herein is not
to be duplicated or transferred in any manner without prior written permission from Elgar Electronics Corporation.
May 13, 2004Document No. M161691-03 Rev D

CONTENTS
SECTION 1 SCPI CONFORMANCE INFORMATION ...........................1-1
1.1 Introduction...........................................................................................1-1
1.2 Parameter Definitions...........................................................................1-1
1.3 Units .....................................................................................................1-1
1.4 Conventions..........................................................................................1-2
1.5 Queries.................................................................................................1-2
SECTION 2 POWER-ON AND RESET CONDITIONS..........................2-1
2.1 Factory Defaults ...................................................................................2-1
2.2 Power-On Conditions ...........................................................................2-1
2.3 Reset Conditions..................................................................................2-2
2.4 Changing Voltage Ranges Via Command Interface.............................2-2
2.5 Changing Ranges During Recall Via Command Interface....................2-2
SECTION 3 SCPI COMMANDS...........................................................3-1
3.1 Miscellaneous Commands....................................................................3-1
3.2 MEASURE Commands ........................................................................ 3-1
3.3 OUTPUT Commands ...........................................................................3-2
3.4 SOURCE Commands...........................................................................3-2
3.5 STATUS Commands............................................................................3-4
3.6 SYSTEM Commands ...........................................................................3-4
3.7 Master/Slave Commands .....................................................................3-5
3.8 Common Commands............................................................................3-6
Programming Manual i

Contents Elgar CW-P Series
SECTION 4 RS-232 INTERFACE....................................................... 4-1
4.1 RS-232 Interface Operation..................................................................4-1
4.2 RS-232 Characteristics.........................................................................4-1
4.3 RS-232 Connector ................................................................................4-2
APPENDIX A: STATUS REGISTER DEFINITIONS .......................... A-1
A.1 Status Byte........................................................................................... A-1
A.2 Standard Event Status Register........................................................... A-2
A.3 Operation Status/Questionable Status Registers................................A-3
A.4 Error/Event Queue..............................................................................A-3
A.5 Serial Poll Operation............................................................................ A-3
APPENDIX B: ERROR CODES.......................................................... B-1
B.1 Error Codes Returned by SYSTem:ERRor? Query.............................. B-1
B.2 SCPI Error Codes ................................................................................B-1
APPENDIX C: SAMPLE PROGRAMS ................................................ C-1
ii Programming Manual

SECTION 1
1.1 Introduction
1.2
SCPI CONFORMANCE INFORMATION
This manual provides programming information for Elgar’s ContinuousWave™ series
programmable AC power sources. This manual is to be used in conjunction with the
CW-P Series Programmable AC Power Source Operation Manual (Elgar Document
No. M161691-01).
The CW-P Series power sources conform to all specifications for devices as defined in
IEEE 488.2, and comply with SCPI command syntax version 1995.0.
Parameter Definitions
Type Valid Arguments
<boolean> ON, OFF, 0, or 1, HIgh, LOw
<value> Integer or Floating point number
<name> String enclosed by single or double quotes
1.3 Units
The CW Series accepts the following units as suffixes to numeric values:
Type of Unit Valid Suffix
Voltage “Volts” or “V”
Current “Amps” or “A”
Frequency “Hz”
Time “ms” (milliseconds), “s” (seconds), or “min” (minutes)
Programming Manual 1-1

SCPI Conformance Information Elgar CW-P Series
1.4 Conventions
1.5 Queries
Commands enclosed by “[ ]” are optional.
For example, SOURce:VOLTage:LEVel:IMMediate:AMPLitude 120.0
can be written as, SOURce:VOLTage 120.0.
The query syntax is identical to the command syntax, with a ”?” appended.
For example, to query the programmed voltage on phase A, send the string:
SOURce:VOLTage?
A subsequent device read will return a value such as “120.00”. All queries are
terminated with a carriage return and line feed (0x0D 0x0A) for those GPIB controllers
that require termination characters. When the CW unit has nothing to report, its output
buffer will contain three ASCII characters: space, carriage return, and linefeed (in
decimal these values are <32><13><10>).
1-2 Programming Manual

SECTION 2
2.1
2.2
POWER-ON AND RESET CONDITIONS
The following sections define the factory and reset power-on conditions of the unit.
Factory Defaults
When the CW-P unit is first powered up, the following factory defaults will be in place:
• GPIB Address: 25
• RS-232 Baud Rate: 9600
• RS-232 Data Bits: 8
• RS-232 Stop Bits: 1
• RS-232 Parity: N
Power-On Conditions
When the CW-P unit is first powered up, the system reads in the configuration that was
last saved to memory position 0. The specific system items in Save and Recall are:
• VoltsA, VoltsB, VoltsC (B and C for multi-unit configuration)
• Voltage Range, either High or Low
• Current Protection Type, either Fold or Shut
• Current Shutdown Time
• Current LimitA, Current LimitB, Current LimitC (B and C for multi-unit configuration)
• Frequency
• Phase AngleAB
• Phase AngleAC
• External Input Assignment, either Analog In or Pulse Out.
Programming Manual 2-1

Power-On and Reset Conditions Elgar CW-P Series
In addition, unique system settings are read in from the non-volatile EEROM memory:
• Output Relay State, either Auto Start or Standby
• Keyboard Lock State, either Front Panel Program Enabled or Disabled
• Master/Slave status if part of a multi-unit configuration
2.3
2.4
2.5
Reset Conditions
When the *RST command is sent via SCPI, the following conditions apply:
• Faults are cleared
• The error queue is cleared
• The output relay is opened
• VoltsA, VoltsB, VoltsC are set to 0
• A locked keyboard remains locked.
Changing Voltage Ranges Via Command Interface
When the voltage range is changed using the command interface:
SOUR:VOLT:RANGE 1
If moving from low range to high range, and the output relay was initially in the closed
state, the CW will open the output relay. In this case, the programmer must re-close the
relay and set the new voltage.
Changing Ranges During Recall Via Command Interface
Assume that the CW is in low range with the output relay closed and sourcing 100 volts.
If a recall is performed:
SYST:RECALL 33
And the recalled system state was initially saved in high range, the output relay will
open, the new system values will be read into the CW parameters, the CW will shift into
high range, and the output relay will re-close. The entire process takes approximately
two seconds. The CW cannot change ranges seamlessly with the output relay closed
during the transition.
2-2 Programming Manual

SECTION 3
3.1
SCPI COMMANDS
Miscellaneous Commands
:ASSYno? Returns the assembly number.
3.2 MEASURE Commands
:MEASure [phase] Measurement words, phase 1-3.
:CURRent Return measured current.
:PEAK? Return the peak current measured.
:INRUSH? Return the inrush current measured.
:FREQuency? Return the frequency measured.
:PEAKCURRent? Return the peak current measured.
:POWer? Return presently calculated power in Watts.
:POWer
:TOTAL? Return presently calculated power in Watts.
:POWERFACtor? Return the power factor measured.
:POWERFACtor
:TOTAL? Return the power factor measured.
:CRESTFACtor? Return the crest factor measured.
:VA? Return the Volt/Amps measured/calculated.
:VA Return the Volt/Amps measured/calculated.
:TOTAL? Return the Volt/Amps measured/calculated.
:VOLTage? Return the RMS voltage.
Programming Manual 3-1

SCPI Commands Elgar CW-P Series
3.3 OUTPUT Commands
:OUTPut? Return the state of the output relay.
:OUTPut <boolean> Set the output relay to open (OFF) or closed (ON).
:OUTPut
:STATe? Return the state of the output relay.
:STATe <boolean> Set the output relay to open (OFF) or closed (ON).
3.4 SOURCE Commands
:SOURce[phase] Power Supply source menu tree.
:CURRent? Return the present current limit setpoint.
:CURRent [<value>] Set foldback over-current mode and optionally
specify the over-current value.
:LEVel? Return the present current limit setpoint.
:LEVel [<value>] Set over-current limit setpoint.
:IMMediate [<value>] Process new amplitude without waiting for more
commands.
:AMPLitude <value> Set over-current limit setpoint.
:AMPLitude? Return the present current limit setpoint.
:PROTection? Return the present current limit setpoint amps.
:PROTection [<value>] Specifies the over current shutdown mode and
optionally can specify the over current value.
:CLEar Clears the over-current protection circuit.
:CURTimeout?
:CURTimeout [<value>] Programs the current level in current foldback mode
and optionally sets the timeout value in milliseconds.
:STATe? Return the present current limit.
0 = CW in foldback mode, 1 = shutdown mode
:STATe <boolean> Program the over-current timeout circuit to enabled
or disabled (foldback).
:TIMe <value> Program the over-current timeout setpoint.
:TIMe? Return the over-current timeout setpoint.
:LEVel <value> Sets the over-current setpoint.
:LEVel? Returns the over-current setpoint.
:STATe <boolean> Set over-current active = ON, OFF to disable.
:STATe? Return present over-current state.
:TRIPped? Return 1 if the over-current circuit has tripped,
0 if not.
3-2 Programming Manual