KEPCO MST 488-27HT User manual

MODEL
OPERATOR’S MANUAL
IMPORTANT NOTES:
1) This manual is valid for the following Model and associated serial numbers:
MODEL SERIAL NO. REV. NO.
2) A Change Page may be included at the end of the manual. All applicable changes and
revision number changes are documented with reference to the equipment serial num-
bers. Before using this Instruction Manual, check your equipment serial number to identify
your model. If in doubt, contact your nearest Kepco Representative, or the Kepco Docu-
mentation Office in New York, [phone], requesting the correct revision for your par-
ticular model and serial number.
3) The contents of this manual are protected by copyright. Reproduction of any part can be
made only with the specific written permission of Kepco, Inc.
Data subject to change without notice.
KEPCO®
THE POWER SUPPLIER™
ORDER NO. REV. NO.
KEPCO INC.
An ISO 9001 Company.
KEPCO, INC. 131-38 SANFORD AVENUE FLUSHING, NY. 11355 U.S.A. TEL [phone] FAX [phone]
email: [e-mail] World Wide Web: www.kepcopower.com
©2020, KEPCO, INC
P/N 243-1407
MST 488-27HT
POWER MODULE CONTROLLER
INTERACTIVE DIGITALLY CONTROLLED
POWER MODULE SYSTEM
MST 488-27HT
POWER MODULE
CONTROLLER

228-1372 COND/CONFORM 051120 A
Conditions of Conformance
Programming Module
When this product is used in applications governed by the requirements of the EEC, the following restric-
tions and conditions apply:
1. For European applications, requiring compliance to the Low Voltage Directive, 73/23/EEC, this power
supply is considered a component product, designed for “built in” applications. Because it is incom-
plete in construction, the end product enclosure must provide for compliance to any remaining electri-
cal safety requirements and act as a fire enclosure. (EN61010-1 Cl. 6, Cl. 7, Cl.8, Cl. 9 and EN61010-
1 annex F)
2. This power supply is designed for stationary installation either within an equipment rack or a KEPCO
Rack Adapter RA 55 or CA 400.
3. This power supply is considered a Class 1 (earthed) product, and as such depends upon proper con-
nection to protective earth for safety from electric shock. (EN61010-1 Cl. 6.5.4)
4. This power supply is intended for use as part of equipment meant for test, measurement and labora-
tory use, and is designed to operate from single phase, three wire power systems. This equipment
must be installed in a specifically designed KEPCO rack adapter and within a suitably wired equipment
rack, utilizing a three wire (grounded) mains connection. See wiring section of this manual for com-
plete electrical wiring instructions. (EN61010-1 Cl. 6.5.4 and Cl.6.10.1)
5. This power supply has secondary output circuits that are considered SELV.
6. This power supply employs a supplementary circuit protector in the form of a fuse mounted within its
enclosure. The fuse protects the power supply itself from damage in the event of a fault condition. For
complete circuit protection of the end product, as well as the building wiring, it is required that a pri-
mary circuit protection device be fitted to the branch circuit wiring. (EN61010-1 Cl. 9.6.2)
7. Hazardous voltages are present within this power supply during normal operation. All operator adjust-
ments to the product are made via externally accessible switches, controls and signal lines as speci-
fied within the product operating instructions. There are no user or operator serviceable parts within
the product enclosure. Refer all servicing to qualified and trained Kepco service technicians.

B228-1369 SAFETY - (MST) 051120
SAFETY INSTRUCTIONS
1. Installation, Operation and Service Precautions
This product is designed for use in accordance with EN 61010-1 and UL 3101 for Installation Category 2,
Pollution Degree 2. Hazardous voltages are present within this product during normal operation. The
product should never be operated with the cover removed unless equivalent protection of the operator
from accidental contact with hazardous internal voltages is provided.
2. Grounding
This product is a Class 1 device which utilizes protective earthing to ensure operator safety.
3. Electric Shock Hazards
This product outputs hazardous voltage and energy levels as a function of normal operation. Operators
must be trained in its use and exercise caution as well as common sense during use to prevent accidental
shock.
There are no operator serviceable parts or adjustments within the product enclosure.
Refer all servicing to trained service technician.
Source power must be removed from the product prior to performing any servicing.
This product is designed for use with nominal a-c mains voltages indicated on the
rating nameplate.
The PROTECTIVE EARTHING CONDUCTOR TERMINAL must be properly con-
nected prior to application of source power to the product (see instructions on instal-
lation herein) in order to ensure safety from electric shock.
PROTECTIVE EARTHING CONDUCTOR TERMINAL - This symbol indicates the
point on the product to which the protective earthing conductor must be attached.
EARTH (GROUND) TERMINAL - This symbol is used to indicate a point which is
connected to the PROTECTIVE EARTHING TERMINAL. The component installer/
assembler must ensure that this point is connected to the PROTECTIVE EARTH-
ING TERMINAL.
CHASSIS TERMINAL -This symbol indicates frame (chassis) connection, which is
supplied as a point of convenience for performance purposes (see instructions on
grounding herein). This is not to be confused with the protective earthing point, and
may not be used in place of it.
This symbol appears adjacent to any external terminals at which hazardous voltage
levels as high as 500V d-c may exist in the course of normal or single fault condi-
tions.
This symbol appears adjacent to any external terminals at which hazardous voltage
levels in excess of 500V d-c may exist in the course of normal or single fault condi-
tions.
!
!
!
!
!

MST488-27 SVC 051120 i
TABLE OF CONTENTS
SECTION PAGE
SECTION 1 - INTRODUCTION
1.1 Scope of Manual ..................................................................................................................................... 1-1
1.2 General Description................................................................................................................................. 1-1
1.3 Specifications.......................................................................................................................................... 1-2
1.4 Equipment Supplied................................................................................................................................ 1-2
1.5 Accessories............................................................................................................................................. 1-5
SECTION 2 - INSTALLATION
2.1 Unpacking and Inspection....................................................................................................................... 2-1
2.2 Installation............................................................................................................................................... 2-1
2.2.1 Set (GPIB) Device Address............................................................................................................... 2-1
2.2.1.1 Using GPIB.................................................................................................................................. 2-1
2.2.2 Additional GPIB Address Switch Functions....................................................................................... 2-2
2.2.3 Set Shield Ground Jumper ................................................................................................................ 2-3
2.2.4 Insertion............................................................................................................................................. 2-3
2.2.5 Removal............................................................................................................................................. 2-3
2.2.6 Final System Interconnections........................................................................................................... 2-4
2.3 Rear Terminations on the MST 488-27HT.............................................................................................. 2-4
SECTION 3 - OPERATION
3.1 General.................................................................................................................................................... 3-1
3.2 IEEE 488 (GPIB) Bus Protocol................................................................................................................ 3-1
3.2.1 String Parsing.................................................................................................................................... 3-2
3.3 SCPI Programming ................................................................................................................................. 3-3
3.3.1 SCPI Messages................................................................................................................................. 3-3
3.3.2 Common Commands/Queries........................................................................................................... 3-3
3.3.3 SCPI Subsystem Command/Query Structure.................................................................................... 3-3
APPENDIX A - Mainframe 66000© Commands Identical to MST 488-27HT
A.1 Introduction............................................................................................................................................. A-1
APPENDIX B - Mainframe 66000© Commands Supported by MST 488-27HT with Differences
B.1 Introduction............................................................................................................................................. B-1
B.2 FUNC:MODE, FUNC:MODE? — Function Mode................................................................................... B-1
B.3 *IDN? — Identification Query ................................................................................................................. B-1
B.4 Status Register Operation...................................................................................................................... B-1
B.5 SYSTem:ERRor[:NEXT]? Query............................................................................................................ B-2
B.6 SYSTem:SET Command........................................................................................................................ B-3
B.7 TRIGger[:SEQuence]:SOURce Command............................................................................................. B-4
APPENDIX C - Mainframe 66000© Commands Not Supported by MST 488-27HT
C-1 Introduction.............................................................................................................................................. 1

LIST OF FIGURES
FIGURE TITLE PAGE
ii MST488-27 SVC 051120
1-1 MST488-27 Power Module Controller........................................................................................................... iv
1-1 Controller to Power Module Interface (Typical).......................................................................................... 1-2
1-2 Remotely Controlled Power Supply Configurations Using Kepco Products............................................... 1-3
1-3 MST 488-27HT Controller Outline Drawing................................................................................................ 1-4
2-1 Configuration Controls................................................................................................................................ 2-4
2-2 Front and Rear Panels of MST 488-27HT Power Module Controller......................................................... 2-6
3-1 Tree Diagram of SCPI Commands Used with MST 488-27HT Controller.................................................. 3-4

MST488-27 SVC 051120 iii
LIST OF TABLES
TABLE TITLE PAGE
1-1 General Specifications for MST 488-27HT Controller .................................................................................1-2
1-2 Accessories .................................................................................................................................................1-5
2-1 Device Address Selection ...........................................................................................................................2-2
2-2 Input/Output Pin Assignments ....................................................................................................................2-7
3-1 IEEE 488 (GPIB) Bus Interface Functions ..................................................................................................3-1
3-2 IEEE 488 (GPIB) Bus Command Mode Messages .....................................................................................3-2
3-3 IEEE 488 (GPIB) Bus Data Mode Messages ..............................................................................................3-2
A-1 Supported SCPI/IEEE 488.2 Command/query Index ................................................................................A-1
B-1 Mainframe 66000© Commands Supported by
MST 488-27HT with Differences .............................................................................................................B-1
B-2 Error Messages ..........................................................................................................................................B-2
B-3 Operation Condition Register, Operation Enable Register,
and Operation Event Register Bits ..........................................................................................................B-3
B-4 Questionable Event Register, Questionable Condition Register
and Questionable Condition Enable Register Bits ..................................................................................B-3
C-1 Non-Supported SCPI/IEEE 488.2 Command/query Index .........................................................................C-1

iv MST488-27 SVC 051120
FIGURE 1-1. MST488-27 POWER MODULE CONTROLLER

MST 488-27HT 051120 1-1
SECTION 1 - INTRODUCTION
1.1 SCOPE OF MANUAL
This manual contains the specifications and instructions for the installation and operation of the
Model MST 488-27HT Power Module Controller (Figure 1-1), part of the Kepco Model 27553
Mainframe manufactured by Kepco, Inc., Flushing, N.Y. U.S.A.
This controller is designed to control and communicate with Kepco’s MST-MHT Series of Power
Modules. Information regarding the MST-MHT Power modules can be found in the MST-MHT
Series Operator Manual which can be downloaded from the Kepco web site at
www.kepcopower.com/support/opmanls.htm#mst
1.2 GENERAL DESCRIPTION
The Kepco Model 27553 Mainframe is a modular power system that is a functional replacement
for a Keysight 66000© Mainframe. Model 27553 is comprised an RA 55H Rack adapter which
has nine slots and the MST 488-27HT Controller which is installed in one of the RA 55H slots.
The MST 488-27HT Controller is designed to program, control and monitor Kepco MST-MHT
Series power modules installed in the remaining slots of the RA 55H which are functional
replacements for Keysight 61000© Series power modules,.
The MST 488-27HT Controller power up state is to allow Kepco’s MST-MHT power modules to
emulate the Keysight 61000© Series power modules with existing test programs and test
requirement documents. The MST 488-27HT Controller can be controlled as a MST 488-27 by
sending a command (see PAR. B.6) during software initialization to allow the MST 488-27HT
controller and the MST-MHT power modules to operate as defined in the MST 488-27 (non HT
suffix) Programmer Operator Manual which can be downloaded from the Kepco web site at
www.kepcopower.com/support/opmanls.htm#mst
The MST 488-27 drivers ( Labview and IVI ) automatically perform this configuration during the
KpDCpwrInitalizewithOptions function.
The MST 488-27HT has the capability to program, control and monitor the outputs of up to 27
specialized Kepco MST-MHT power supplies (power modules) by adding additional RA 55H
Rack Adapters to the bus. The MST 488-27HT communicates with its Host computer over the
IEEE 488 bus (GPIB) using SCPI (Standard Commands for Programmable Instruments) Lan-
guage. A remote terminal program can allow communication via the RS 232-C (EIA 232) stan-
dard serial communications bus. The MST 488-27HT communicates with the MST-MHT series
using the IEEE1118 two-wire serial bus, hereafter referred to as the Control Bus, which allows
control over distances up to a maximum of 1000 feet (300 meters) (see Figure 1-2).
The IEEE 488 GPIB interface functions implemented by the MST 488-27HT controller are
defined by the IEEE 488 Standard, and described in Table 3-1.
The MST 488-27HT Controller interfaces to an MST-MST power module via the RA 55H Rack
Adapter; (part of Kepco MSP 27553 mainframe). Interconnection to the Host Computer on the
GPIB is made via an IEEE 488 standard cable. If a remote terminal program is used for commu-
nications between the controller and a computer terminal, a 9 pin null-modem RS 232-C con-
nector/cable is required.
The MST 488-27HT Controller is comprised of a single-board computer (SBC) and power sup-
ply housed in a 1/9 Rack (7” high by 1-3/4” wide by 20-1/4” deep) case (see Figure 1-3).

1-2 MST 488-27HT 051120
1.3 SPECIFICATIONS (REFER TO FIGURE 1-3 AND TABLE 1-1)
The Host Computer can set the output voltage with current limit, or the output current with volt-
age limit. The Host Computer can then have the MST 488-27HT read back the actual output
voltage and current delivered by each of the MST power modules to their respective loads. The
MST 488-27HT is continually polling all of the power modules on the Control Bus for overvolt-
age, overcurrent, and other errors. All data transmissions over the GPIB are ASCII encoded.
The values for the command parameters can be written in integer, decimal or scientific notation.
The responses from the MST 488-27HT are detailed in Section 3 of this manual..
1.4 EQUIPMENT SUPPLIED
A terminator, Kepco P/N 195-0086, is included with each controller to provide proper termination
of the IEEE 1118 control bus. In configurations where power modules are daisy chained on the
IEEE 1118 control bus (see Figure 1-1), the last power module control bus outlet (in the daisy
chain) must be terminated with the IEEE Control Bus Terminator supplied with the controller to
reduce spurious noise and provide proper impedance matching.
FIGURE 1-1. CONTROLLER TO POWER MODULE INTERFACE (TYPICAL)
TABLE 1-1. GENERAL SPECIFICATIONS FOR MST 488-27HT CONTROLLER
FEATURE SPECIFICATION
A-C Input Requirements 95 to 264V a-c, 47 to 63 Hz, approximately 12 Watts maximum
Ambient Temperature Range: Operating:
Storage: –20°C to +70°C –40°C to +85°C
Relative Humidity, Operating and Storage 5 to 95% RH, non-condensing
Altitude Operating:
Non-operating: 0 to 10,000 ft 0 to 65,000 ft
Dimensions 7” H x 1-3/4” W x 20-1/4” D
Color (front panel) Kepco gray, Hartin Paint No. 15-22493
Mounting Rack Adapter (Kepco RA 55 or CA 400)

MST 488-27HT 051120 1-3
FIGURE 1-2. REMOTELY CONTROLLED POWER SUPPLY CONFIGURATIONS USING KEPCO PRODUCTS

1-4 MST 488-27HT 051120
FIGURE 1-3. MST 488-27HT CONTROLLER OUTLINE DRAWING

MST 488-27HT 051120 1-5/1-6
1.5 ACCESSORIES
Accessories for the MST 488-27HT are listed in Table 1-2.
TABLE 1-2. ACCESSORIES
ITEM FUNCTION PART NUMBER
Terminator - 5-pin connector Termination for daisy chain on IEEE 1118 bus. 195-0075
Terminator - 9-pin connector 195-0086
Cable - two 5-pin connectors Daisy chain Kepco Power Supplies with 5-pin
connectors on IEEE 1118 bus. 118-0699
Cable - one 5-pin and one 9-pin connector, ~6 ft. (2 m) Daisy chain MST 488-27HTand Kepco Power
Supplies with 5-pin connector on IEEE 1118
bus.
118-0749
Cable - one 5-pin and one 9-pin connector, ~12 ft. (4 m) 118-0852
Cable - two 9-pin connectors, ~ 6 ft. (2 m) Daisy chain MST 488-27HTand Kepco Power
Modules with 9-pin connector on IEEE 1118
bus.
118-0844
Cable - two 9-pin connectors, ~ 12 ft. (4 m) 118-0853

MST 488-27 051120 2-1
SECTION 2 - INSTALLATION
2.1 UNPACKING AND INSPECTION
The Model MST 488-27HT has been carefully inspected and tested prior to packing. Inspect the
shipping carton upon receipt for evidence of damage during transit. Save the original packing
material. If any indication of damage is found, file a claim immediately with the responsible
transport service.
For repairs of a product damaged in shipment, contact the Kepco Factory Representative near-
est you or the Kepco Sales Department directly for further instruction.
2.2 INSTALLATION
The installation and set-up procedure for the MST 488-27HT consists of the following steps:
1. Set Device Address (PAR. 2.2.1).
2. Set Shield Ground Jumper (PAR. 2.2.3).
3. Perform final system interconnections (PAR. 2.2.4).
2.2.1 SET (GPIB) DEVICE ADDRESS (SEE FIGURE 2-1)
A single set of DIP switches, accessible through an access hole on the top (see Figure 2-1), are
used to set the primary GPIB Device Address (the factory default is 6) as well as enable two
Mainframe 66000 functions that are not directly supported by the MST 488-27HT. The following
paragraphs explain how to proceed.
NOTE: MST-MHT modules are addressed using secondary addresses. Refer to MST-MHT
Operator Manual for configuration details (see PAR. 1.1).
2.2.1.1 USING GPIB
The Device Address is the permanent Listener and Talker address of the MST 488-27HT on the
GPIB. It is factory preset to address 6. If a different Device Address is required in your system,
proceed as follows. There are 31 (0-30) possible choices (See Table 2-1).
1. Place MST 488-27HT power module controller with the top of the unit facing you, front panel
to the right.
2. The Device Address DIP switches are positions 1 through 5 (from right to left, see Figure
2-1). These switches are preset by Kepco to address 6. For other device addresses set
them according to Table 2-1.

2-2 MST 488-27 051120
2.2.2 ADDITIONAL GPIB ADDRESS SWITCH FUNCTIONS (SEE FIGURE 2-1)
The GPIB address switch has two additional program mode bits P1 (DIP switch position A6, see
Figure 2-1) and P2 (position A7). P1 and P2 provide a method to enable two common functions
of the Mainframe 66000© that are not directly supported.
The Mainframe 66000© trigger commands are designed to allow a *TRG from one power mod-
ule to cause other power modules to also apply trigger values to their outputs. Setting P2 to a 1
creates a functionality which is equivalent to sending TRIG:SOUR EXT and TRIG:LINK TDC to
all power modules in the system, even though these commands are not supported by the MST
488-27HT controller.
TABLE 2-1. DEVICE ADDRESS SELECTION
DECIMAL
ADDRESS
SELECTOR SWITCH SECTION
(SIGNAL LINE)
A5 A4 A3 A2 A1
000000
100001
200010
300011
400100
500101
600110
700111
801000
901001
1001010
1101011
1201100
1301101
1401110
1501111
1610000
1710001
1810010
1910011
2010100
2110101
2210110
2310111
2411000
2511001
2611010
2711011
2811100
2911101
3011110

MST 488-27 051120 2-3
The Mainframe 66000© OUTP TTL command allows an overvoltage shutdown or current mode
shutdown of one power supply to also shutdown (reset) the other selected power modules, or
for an *RST command sent to one power supply to cause all power modules in the mainframe to
be reset. Setting P1 switch to 1 provides this functionality.
P1- *RST sent to any secondary address will apply *RST functionality to all power modules con-
nected to the controller. Also causes detection of overvoltage or current mode to reset all power
modules connected to the controller.
P2 - *TRG sent to any secondary address will apply *TRG to all power modules connected to
the controller.
2.2.3 SET SHIELD GROUND JUMPER (SEE FIGURE 2-1)
The jumper sets the Shield Ground state for the AC/control bus connector and is accessible
after the cover is removed:
• JUMPER INSTALLED = shield grounded (factory default)
• JUMPER REMOVED = shield not grounded
2.2.4 INSERTION
To insert the MST 488-27HT Controller in the RA 55 Rack Adapter, proceed as follows:
1. To ensure full engagement of the module interconnect to the RA 55 Rack Adapter, pull out
the two slotted captive thumb screws (at the front of the Controller) and turn counterclock-
wise until the threads engage.
CAUTION
When inserting the Controller into a Rack Adapter under power, the Controller POWER
switch must be placed in the OFF position prior to insertion.
2. Align slots of the Controller with the guides of the Rack Adapter and insert Controller into
Rack Adapter slot. Secure with the two thumb screws (maximum torque applied to thumb
screws is 10 foot-lbs).
2.2.5 REMOVAL
To remove the Controller from the RA 55 Rack Adapter, proceed as follows:
CAUTION
When removing a Controller from a Rack Adapter under power, the Controller POWER
switch must be placed in the OFF position prior to extraction.
1. Loosen the two slotted captive thumb screws that hold the Controller in place in the Rack
Adapter until they disengage from the Rack Adapter.
2. Extract the module from the Rack Adapter using the front panel handle.

2-4 MST 488-27 051120
2.2.6 FINAL SYSTEM INTERCONNECTIONS
1. Install the MST 488-27HT in the left-most slot of the RA 55 Rack Adapter (see PAR. 2.2.4). If
the rack adapter has a plate used for mounting a power module connector in slot 9, the plate
must first be removed to accommodate the MST 488-27HT controller by removing four
screws securing the plate to the rack adapter chassis.
2. Install all power modules in the RA 55 Rack Adapter.
3. Connect the MST 488-27HT to the GPIB.
4. All power module outputs should be connected to their respective loads. For MST Power
Module Calibration see the MST Operator's Manual.
5. Connect input power to the RA 55 Rack Adapter in accordance with the RA 55 Rack Adapter
manual.
FIGURE 2-1. CONFIGURATION CONTROLS
2.3 REAR TERMINATIONS ON THE MST 488-27HT (SEE FIGURE 2-2)

MST 488-27 051120 2-5
a. AC INPUT. The MST 488-27HT draws power from the same source used to power the MST
power modules. Power is applied through the Rack Adapter via the AC/control bus connec-
tor.
b. IEEE 488 BUS. This port is a 24 pin IEEE 488 connector and conforms mechanically and
electrically to the IEEE 488 standard. Refer to Table 2-2 for pin assignments.
c. RS 232-C PORT. This port is a standard 9 pin RS 232-C (male) connector). Refer to Table 2-
2 for pin assignments.

2-6 MST 488-27 051120
FIGURE 2-2. FRONT AND REAR PANELS OF MST 488-27HT POWER MODULE CONTROLLER