KEPCO MST-MHT Series User manual

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™
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
MST-MHT SERIES
POWER MODULE
DIGITALLY CONTROLLED POWER MODULE SYSTEM
1/9 RACK SIZE 200 WATT POWER MODULES
FOR USE WITH KEPCO POWER MODULE CONTROLLERS
©2020, KEPCO, INC
P/N 228-1924-r1
MODELS
MST 6-20MHT, MST 15-12MHT,
MST 25-8MHT, MST 36-5MHT,
MST 55-3.5MHT, MST 75-2.5MHT,
MST 100-2MHT, MST 150-1.2MHT

228-1364 COND/CONFORM 071320 A
Conditions of Conformance
MST “Modular” products
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. (EN61010-1:2001 Cl. 6, Cl. 7, Cl.8, and Cl. 9)
2. This power supply is designed for stationary installation, with mains power applied via a KEPCO Rack
Adapter.
3. This power supply is considered a Class 1 (earthed) product. It is intended for use as part of equip-
ment meant for test, measurement and laboratory 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 complete electrical wiring instructions. (EN61010-1:2001
Cl.6.10.1)
4. This power supply has secondary output circuits that are considered hazardous.
5. The output wiring terminals of this power supply have not been evaluated for field wiring and, there-
fore, must be properly configured by the end product manufacturer prior to use.
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. (EN61010-1:2001 Cl. 9.5)
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.

B071320
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. This
product is designed for use in a KEPCO Rack Adapter product. Operation of this product without a rack
adapter should never be attempted. 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.
!
!
!
!
!

MST-MHT SERIES 071320 i
TABLE OF CONTENTS
SECTION PAGE
SECTION 1 - INTRODUCTION
1.1 Scope of Manual ..................................................................................................................................... 1-1
1.2 Description .............................................................................................................................................. 1-1
1.3 Specifications.......................................................................................................................................... 1-2
1.4 Features.................................................................................................................................................. 1-4
1.4.1 Control/Programming......................................................................................................................... 1-4
1.4.2 Status Indicators................................................................................................................................ 1-6
1.4.3 Front Panel Meters............................................................................................................................ 1-6
1.4.4 Output Enable/Disable and Polarity Reversal.................................................................................... 1-6
1.4.5 Protection........................................................................................................................................... 1-6
1.4.6 Series Configurations ........................................................................................................................ 1-7
1.4.7 Parallel Configuration ........................................................................................................................ 1-7
1.5 Options.................................................................................................................................................... 1-7
1.6 Accessories............................................................................................................................................. 1-7
SECTION 2 - INSTALLATION
2.1 Unpacking and Inspection....................................................................................................................... 2-1
2.2 Terminations and Controls ...................................................................................................................... 2-1
2.3 A-C Input Requirement............................................................................................................................ 2-1
2.4 Cooling.................................................................................................................................................... 2-1
2.5 Installation/Removal................................................................................................................................ 2-3
2.5.1 Changing Control Bus Address (Node or Channel Number)............................................................. 2-3
2.5.2 Installation.......................................................................................................................................... 2-5
2.5.3 Removal............................................................................................................................................. 2-6
2.6 Grounding................................................................................................................................................ 2-6
2.6.1 Safety Grounding............................................................................................................................... 2-6
2.6.2 D-C (Output) Grounding .................................................................................................................... 2-6
2.7 Preliminary Check-out............................................................................................................................. 2-7
2.7.1 Required Equipment.......................................................................................................................... 2-7
2.7.2 Initial Setup........................................................................................................................................ 2-7
2.7.3 Checkout Procedure.......................................................................................................................... 2-9
2.8 Power Module to Load Interface ............................................................................................................. 2-10
2.9 Connection, General ............................................................................................................................... 2-11
2.9.1 Load Connection with Local Error Sensing........................................................................................ 2-12
2.9.2 Load Connection with Remote Error Sensing.................................................................................... 2-12
SECTION 3 - OPERATION
3.1 Introduction to Controlling the MST-MHT Power Module Output............................................................ 3-1
3.1.1 Status Flags (Error Messages).......................................................................................................... 3-1
3.1.2 Timing Requirements for a Valid Status............................................................................................ 3-1
3.2 Operating Modes..................................................................................................................................... 3-2
3.2.1 Voltage Mode..................................................................................................................................... 3-2
3.2.2 Current Mode..................................................................................................................................... 3-2
3.3 Output Polarity Reversal ......................................................................................................................... 3-2
3.4 Output Enable and Disable ..................................................................................................................... 3-4
3.5 Parallel Operation.................................................................................................................................... 3-4
3.6 Series Operation ..................................................................................................................................... 3-5
3.7 Fault Protection....................................................................................................................................... 3-5
3.7.1 Fault Recovery................................................................................................................................... 3-6
3.7.2 Fixed Overvoltage Detector............................................................................................................... 3-6
3.7.3 Overcurrent Tracking Detector .......................................................................................................... 3-6
3.7.4 Overtemperature Detectors............................................................................................................... 3-6
3.7.5 A-C Loss Detector ............................................................................................................................. 3-7
3.7.6 Open Sense/Power Wire Protection.................................................................................................. 3-7

ii MST-MHT SERIES 071320
TABLE OF CONTENTS
SECTION PAGE
3.8 Programmable Protection....................................................................................................................... 3-7
3.8.1 Programmable Overvoltage Protection............................................................................................. 3-7
3.8.2 Programmable Current Mode Protection.......................................................................................... 3-7
3.9 Calibration............................................................................................................................................... 3-8
3.9.1 Equipment Required......................................................................................................................... 3-8
3.9.2 +5 Volts Reference Adjust (R49) ...................................................................................................... 3-10
3.9.3 Output Voltage (EO) Zero Adjust (R11) ............................................................................................ 3-10
3.9.4 Current Sense Zero Adjust (R50) ..................................................................................................... 3-10
3.9.5 Output Current IOZero Adjust (R51)................................................................................................ 3-11
3.9.6 Voltage Reference Adjust (R47) ....................................................................................................... 3-11
3.9.7 Current Reference Adjust (R48) ....................................................................................................... 3-11
3.9.8 Current (IO) Full Scale Adjust (R52) ................................................................................................. 3-12

LIST OF FIGURES
FIGURE TITLE PAGE
MST-MHT SERIES 071320 iii
LIST OF TABLES
TABLE TITLE PAGE
1-1 MST Power Supply.............................................................................................................................. iv
1-1 MST-MHT Power Supply, Mechanical Outline Drawing ....................................................................... 1-5
2-1 Front and Rear Views of the MST-MHT Power Module........................................................................ 2-2
2-2 Configuration and Calibration Controls and Test Points....................................................................... 2-5
2-3 Initial Checkout Setup........................................................................................................................... 2-8
2-4 DC Output Connector Configuration for Preliminary Checkout............................................................. 2-9
2-5 Output Impedance vs. Frequency......................................................................................................... 2-11
2-6 Connector Locations and Pin Assignments.......................................................................................... 2-13
3-1 Calibration Test Set-up ......................................................................................................................... 3-10
1-1 MST-MHT Model Parameters ...............................................................................................................1-2
1-2 MST-MHT General Specifications ........................................................................................................1-2
1-3 Accessories ...........................................................................................................................................1-7
2-1 Functions of Internal Controls ...............................................................................................................2-1
2-2 Front Panel Controls and Indicators .....................................................................................................2-2
2-3 Rear Terminations ................................................................................................................................2-3
2-4 Secondary Address Selection ...............................................................................................................2-4
2-5 DC Output Connector/Adapter Kit Terminal Designations ....................................................................2-11
3-1 Error Messages .....................................................................................................................................3-1
3-2 Maximum External Capacitance Values to Ensure Dry Switching ........................................................3-4

iv MST SERIES 071320
FIGURE 1-1. MST POWER SUPPLY

MST-MHT SERIES 071320 1-1
SECTION 1 - INTRODUCTION
1.1 SCOPE OF MANUAL
This manual contains instructions for the installation, operation, and maintenance of the MST-
MHT series of 200 Watt, voltage and current stabilized d-c programmable power supplies
(power modules) manufactured by Kepco, Inc., Flushing, New York, U.S.A. when controlled by a
Kepco Model MST 488-27HT Controller.
Details regarding the MST 488-27HT Controller can be found in the MST 488-27HT Controller
Operator Manual which is available for download from the Kepco website at:
www.kepcopower.com/support/opmanls.htm#mst
Details regarding the RA 55 Connector Adapter can be found in the Kit 219-0618 RA 55 Con-
nector Adapter Kit Instruction Sheet which is available for download from the Kepco website at:
www.kepcopower.com/support/opmanls.htm#kit
1.2 DESCRIPTION
The Kepco MST-MHT 200 Watt Series (Figure 1-1) consists of eight, single-output models as
shown in Table 1-1. MST-MHT Series Power Modules are designed to provide a functional drop-
in replacement for Keysight/Agilent/HP Series 66000A© power modules. These models also
include the following additional features: autoranging a-c input, PFC to meet IEC/EN require-
ments, current share, hot swap, built-in polarity reversal, constant current mode and greater
power (180W to 200W).
MST-MHT power modules employ a switch mode preregulator for high efficiency and power
density, with linear output stabilization for accuracy and resolution. Their modular, plug-in design
with 7" x 1-3/4” cross-section allows nine independently controlled modules to be mounted
abreast in a standard (19" x 7" x 20.9") Kepco Model RA 55H rack adapter or 5 modules in a
standard (9.6” x 7” x 20.9”) Kepco Model CA 400H case.
Each Power Module is controlled digitally via the IEEE 1118 2-wire serial bus (“Bitbus”) with 12
bits of resolution over the entire voltage and current ranges. Voltage and current are displayed
on LED panel meters, and read back over the control bus with an accuracy of 0.06%. Operating
status is displayed on front panel LED indicators and read back over the bus.
An MST-MHT Power Module can be removed and installed without powering down the system if
the module POWER switch is set to OFF. Employing current-sharing for parallel operation, they
may be “hot-swapped” for redundant (N+1) applications. MST-MHT Power Supplies can be
operated with universal a-c input power sources (90-264Vac, 47-63Hz) and incorporate power
factor correction (0.98) to meet EN 61000-3-2. MST-MHT Power Modules can also be config-
ured in series for higher than rated output voltages (500V d-c maximum)

1-2 MST-MHT SERIES 071320
.
1.3 SPECIFICATIONS
The MST-MHT Series electrical and mechanical specifications are listed in Tables 1-1 and 1-2.
TABLE 1-1. MST-MHT MODEL PARAMETERS
MODEL
OUTPUT
VOLTAGE
Adjustment
Range
(V d-c)
OVERVOLTAGE
(V d-c) OUTPUT CURRENT Maximum (Amps) RIPPLE/NOISE EFFICIENCY
(100% Load
120V a-c)
Programmable
(max.)
Hardware
Trigger
(See Note) 45°C 55°C 65°C mVrms mVp-p
MST 6-20MHT 0-6 7.2 7.4 20 16 12 2 5 51%
MST 15-12MHT 0-15 18 18.3 12 9.6 7.2 3 7 61%
MST 25-8MHT 0-25 30 30.6 8 6.4 4.8 4 8 62%
MST 36-5MHT 0-36 42 42.8 5 4.0 3.0 5 10 63%
MST 55-3.5MHT 0-55 66 67.3 3.5 2.8 2.1 9 15 64%
MST 75.2.5MHT 0-75 90 91.8 2.5 2.0 1.5 12 20 64%
MST 100-2MHT 0-100 120 122.4 2.0 1.6 1.2 15 35 66%
MST 150-1.2MHT 0-150 180 183.6 1.2 1.0 0.7 20 45 66%
NOTE: Minimum 2% above Programmable (max.),
TABLE 1-2. MST-MHT GENERAL SPECIFICATIONS
SPECIFICATIONS RATING/DESCRIPTION CONDITION
INPUT
A-C Voltage nominal 100-250V a-c Single phase
range 90-264 Va-c Brownout Voltage 85Vrms
Frequency nominal 50-60 Hz At >63 Hz, input leakage current
exceeds specifications
range 47 – 63 Hz (400 Hz)
Input Current maximum 3.6A rms 90V a-c Input
Current Harmonics Within EN 61000-3-2 limits Any source condition, rated load
Efficiency minimum See Model Table 1-1 120V a-c, rated output Load
EMI FCC Class A, CISPR 11 Class A Conducted Emissions
Leakage Current
120V a-c,
60Hz <0.5 mA
240V a-c,
50Hz <1.0 mA
Power Factor 0.98 min. All source conditions, full load
EMC Complies with IEC 61326-1, Class A
OUTPUT
Source Effect Voltage 0.001% 90 – 132, 176 – 264V a-c,
any load condition
Current 0.005%
Load Effect Voltage ±0.002% or 1mV, whichever is greater 10% to 100% Load at EMAX,
any source condition
Current ±0.005% 10% to 100% Load at IMAX
Temperature Effect Voltage 0.01%/°C Any source/load condition
(0 – 45° C)
Current 0.02%/°C