Spellman PTV Series User manual

R
High Voltage Power Supply
MODEL:
SERIAL#:
DATE:
SPELLMAN
HIGH VOLTAGE ELECTRONICS
CORPORATION
475 Wireless Blvd.
Hauppauge, New York, 11788
[phone]*FAX: [phone]*
E-mail: [email protected]
Website: www.spellmanhv.com
PTV MANUAL 118013-001 Rev B
PTV SERIES

Spellman’s PTV Series of modular high voltage power
supplies deliver up to 350W of continuous power. A
quasi-resonant inverter design provides over 80% effi-
ciency with very fast dynamic response. PTV power
supplies incorporate extensive standard features in two
power output ranges (200W and 350W) with a wide
range of output voltages operating to the most exacting
specifications.
TYPICAL APPLICATIONS
Projection Television
X-ray Systems
E-beam Systems
Capacitor Charging systems
CPT/CRT Testing
OPTIONS
FG Floating Ground (50V max)
BPM/S Bipolar Master/Slave
NSS No Slow Start
TP(x) Alternate Test Point Scaling
SPECIFICATIONS
Input:
115Vac±10%, 50/60Hz.
220Vac±10%, 50/60Hz.
Optional: 100Vac±10%, 50/60Hz.
Specify at time of ordering.
Output:
Models from 1kV to 70kV, 200W or 350W. Each model is
available in positive or negative polarity outputs.
Voltage Regulation:
Load: 0.01% of output voltage no load to full load.
Line: ±0.01% for a ±10% change in input voltage.
Current Regulation:
Load: 0.01% of output current from 0 to rated voltage.
Line: 0.01% of rated current over specified input range.
Efficiency:
80%, typical.
Ripple:
PTV200: 0.1% p-p of output voltage.
PTV350: 0.2% p-p of output voltage.
Switching Frequency:
45-65kHz, nominal
Temperature:
Operating: 0°C to +40°C.
Storage: -40°C to +85°C.
Voltage Temperature Coefficient:
0.01%/°C
Stability (voltage & current):
0.01%/hr after 1/2 hour warm-up.
0.02% per 8 hours.
Cooling:
200W: Convection cooled.
350W: Fan cooled, rear air intake.
Dimensions:
1-40kV: 33/16”H x 103/4”W x 10”D
(8.1cm x 27.3cm x 25.4cm).
50-70kV: 43/16”H x 107/8”W x 1113/16”D
(10.65cm x 27.6cm x 35.1cm).
HV Output:
Flying lead 18”±1”(45.7cm) UL listed.
AMP LGHI connector available for 40kV only.
Power Input Connector:
IEC320.
AC Line Voltage Input Cable:
Length: 8’ (2.4m).
Regulatory Approvals:
Compliant to 2004/108/EC, the EMC Directive
and 2006/95/EC, the Low Voltage Directive.
UL/CUL recognized, File E148969 (up to 5kV only).
•Output Voltages from 1kV to 70kV
•Overvoltage and Short Circuit Protection
•EMI/RFI Input Filter
•Test Points for Output Current and Voltage
•Internal 10V Reference
•Output Inhibit Control Via TTL Signal
•OEM Customization Available
SPELLMAN HIGH VOLTAGE ELECTRONICS CORPORATION
PTV 200W & 350W
POWER SUPPLY PAGE 1 OF 2
www.spellmanhv.com/manuals/PTV
Corporate Headquarters
Hauppauge, New York USA
[phone] FAX: [phone]
e-mail: [e-mail]
www.spellmanhv.com 128007-001 REV. H
Spellman High Voltage is an ISO 9001:2008 and ISO 14001:2004 registered company
Copyright © 2002 Spellman High Voltage Electronics Corp.

PTV SELECTION TABLE
200 Watt 350 Watt
Model PTV200 Model PTV350
kV mA Model Number kV mA Model Number
1 200 PTV1*200 1 350 PTV1*350
370 PTV3*200 3 117 PTV3*350
5 40 PTV5*200 5 70 PTV5*350
10 20 PTV10*200 10 35 PTV10*350
15 14 PTV15*200 15 23 PTV15*350
20 10 PTV20*200 20 18 PTV20*350
25 8 PTV25*200 25 14 PTV25*350
30 7 PTV30*200 30 12 PTV30*350
40 5 PTV40*200 40 9 PTV40*350
50 4 PTV50*200 50 7 PTV50*350
60 3.3 PTV60*200 60 5.8 PTV60*350
70 2.85 PTV70*200 70 5.0 PTV70*350
*Specify “P” for positive polarity or “N” for negative polarity.
INTERFACE CONNECTOR 9 PIN
PIN SIGNAL PARAMETERS
1 +10Vdc Reference +10Vdc @ 1mA, maximum
2 Current Program 0 to 10Vdc = 0 to 100% rated output, Zin = 10MΩ
3 Voltage Monitor 0 to 10Vdc = 0 to 100% rated output, Zout = 10kΩ
4 Voltage Program 0 to 10Vdc = 0 to 100% rated output, Zin = 10MΩ
5 Common Ground Power Ground
6 Current Monitor 0 to 10Vdc = 0 to 100% rated output, Zout = 10kΩ
7 Enable/Inhibit Ground = Inhibit, Open = HV ON
8 OVP Indicator Collector w/1kΩpull up to +5Vdc, transistor on =OVP
9 Signal Return Signal Return
DIMENSIONS: in.[mm]
SPELLMAN HIGH VOLTAGE ELECTRONICS CORPORATION
PTV 200W & 350W
POWER SUPPLY PAGE 2 OF 2
Corporate Headquarters
Hauppauge, New York USA
[phone] FAX: [phone]
e-mail: [e-mail]
www.spellmanhv.com 128007-001 REV. H
Spellman High Voltage is an ISO 9001:2008 and ISO 14001:2004 registered company
Copyright © 2002 Spellman High Voltage Electronics Corp.

IMPORTANT SAFETY PRECAUTIONS
SAFETY
THIS POWER SUPPLY GENERATES VOLTAGES THAT ARE DANGEROUS AND MAY BE FATAL.
OBSERVE EXTREME CAUTION WHEN WORKING WITH THIS EQUIPMENT.
High voltage power supplies must always be grounded.
Do not touch connections unless the equipment is off and the
Capacitance of both the load and power supply is discharged.
Allow five minutes for discharge of internal capacitance of the power supply.
Do not ground yourself or work under wet or damp conditions.
SERVICING SAFETY
.
Maintenance may require removing the instrument cover with the power on.
Servicing should be done by qualified personnel aware of the electrical hazards.
WARNING note in the text call attention to hazards in operation of these units
that could lead to possible injury or death.
CAUTION notes in the text indicate procedures to be followed to avoid possible
damage to equipment.
Copyright ©2000, Spellman High Voltage Electronics Corporation. All Rights Reserved.
This information contained in this publication is derived in part from proprietary and patent data. This information has
been prepared for the express purpose of assisting operating and maintenance personnel in the efficient use of the
model described herein, and publication of this information does not convey any right to reproduce it or to use it for
any purpose other than in connection with installation, operation, and maintenance of the equipment described.
118004-001 REV. B

WICHTIGE SICHERHEITSHINWEISE
SICHERHEIT
DIESES HOCHSPANNUNGSNETZTEIL ERZEUGT LEBENSGEFÄHRLICHE HOCHSPANNUNG.
SEIN SIE SEHR VORSICHTIG BEI DER ARBEIT MIT DIESEM GERÄT.
Das Hochspannungsnetzteil muß immer geerdet sein.
Berühren Sie die Stecker des Netzteiles nur, wenn das Gerät ausgeschaltet ist und die elektrischen
Kapazitäten des Netzteiles und der angeschlossenen Last entladen sind.
Die internen Kapazitäten des Hochspannungsnetzteiles benötigen ca. 5 Minuten, um sich zu entladen.
Erden Sie sich nicht, und arbeiten Sie nicht in feuchter oder nasser Umgebung.
Notwendige Reparaturen können es erforderlich machen, den Gehäusedeckel während des Betriebes zu
entfernen.
Reparaturen dürfen nur von qualifiziertem, eingewiesenem Personal ausgeführt werden.
“WARNING” im folgenden Text weist auf gefährliche Operationen hin, die zu Verletzungen oder zum Tod
führen können.
“CAUTION” im folgenden Text weist auf Prozeduren hin, die genauestens befolgt werden müssen, um
eventuelle Beschädigungen des Gerätes zu vermeiden.
SERVICESICHERHEIT
118004-001 REV. B

PRECAUTIONS IMPORTANTES POUR VOTRE SECURITE
CONSIGNES DE SÉCURITÉ
CETTE ALIMENTATION GÉNÈRE DES TENSIONS QUI SONT DANGEUREUSES ET PEUVENT ÊTRE FATALES.
SOYEZ EXTRÊMENT VIGILANTS LORSQUE VOUS UTILISEZ CET ÉQUIPEMENT.
Les alimentations haute tension doivent toujours être mises à la masse.
Ne touchez pas les connectiques sans que l’équipement soit éteint et que la capacité à la fois de la charge et de
l’alimentation soient déchargées.
Prévoyez 5 minutes pour la décharge de la capacité interne de l’alimentation.
Ne vous mettez pas à la masse, ou ne travaillez pas sous conditions mouillées ou humides.
La maintenance peut nécessiter l’enlèvement du couvercle lorsque l’alimentation est encore allumée.
Les réparations doivent être effectuées par une personne qualifiée et connaissant les risques électriques.
Dans le manuel, les notes marquées « WARNING » attire l’attention sur les risques lors de la manipulation de ces
équipements, qui peuvent entrainer de possibles blessures voire la mort.
Dans le manuel, les notes marquées « CAUTION » indiquent les procédures qui doivent être suivies afin d’éviter
d’éventuels dommages sur l’équipement.
CONSIGNES DE SÉCURITÉ EN CAS DE REPARATION
118004-001 REV. B

IMPORTANTI PRECAUZIONI DI SICUREZZA
SICUREZZA
QUESTO ALIMENTATORE GENERA TENSIONI CHE SONO PERICOLOSE E
POTREBBERO ESSERE MORTALI.
PONI ESTREMA CAUTELA QUANDO OPERI CON QUESO APPARECCHIO.
Gli alimentatori ad alta tensione devono sempre essere collegati ad un impianto di terra.
Non toccare le connessioni a meno che l’apparecchio sia stato spento e la capacità interna
del carico e dell’alimentatore stesso siano scariche.
Attendere cinque minuti per permettere la scarica della capacità interna dell’alimentatore
ad alta tensione.
Non mettere a terra il proprio corpo oppure operare in ambienti bagnati o saturi d’umidità.
SICUREZZA NELLA MANUTENZIONE.
Manutenzione potrebbe essere richiesta, rimuovendo la copertura con apparecchio
acceso.
La manutenzione deve essere svolta da personale qualificato, coscio dei rischi elettrici.
Attenzione alle AVVERTENZE contenute nel manuale, che richiamano all’attenzione ai
rischi quando si opera con tali unità e che potrebbero causare possibili ferite o morte.
Le note di CAUTELA contenute nel manuale, indicano le procedure da seguire per evitare
possibili danni all’apparecchio.
118004-001 REV. B

PTV MANUAL i 118012-001 REV B
Table of Contents
PAGE
1. INTRODUCTION
1.1 Description of the PTV Series.............................................................................1
1.2 PTV Specifications..............................................................................................1
1.3 Standard Features.................................................................................................2
1.4 Options.................................................................................................................2
1.5 Interpreting the Model Number...........................................................................2
2. INSPECTION & INSTALLATION
2.1 Initial Inspection..................................................................................................3
2.2 Mechanical Installation........................................................................................3
3. OPERATING INSTRUCTIONS
3.1 Operation .............................................................................................................5
3.2 Standard Features.................................................................................................6
4. PRINCIPLES OF OPERATION
4.1 AC to DC Rectifier and Associated Circuits.......................................................10
4.2 High Frequency Inverter......................................................................................10
4.3 High Voltage Circuits..........................................................................................10
4.4 Control Circuits....................................................................................................11
4.5 Options.................................................................................................................11
5. OPTIONS
5.1 Floating Ground...................................................................................................12
5.2 220C AC Single Phase Input...............................................................................12
5.3 No Slow Start.......................................................................................................12
5.4 Non-Standard Slow Start.....................................................................................12
5.5 Extra Length Output Cable..................................................................................12
5.6 Focus....................................................................................................................12
5.7 Grid......................................................................................................................12
5.8 Custom Designed Models....................................................................................12
6. MAINTENANCE
6.1 Periodic Servicing................................................................................................14
6.2 Performance Test.................................................................................................14
6.3 High Voltage Dividers.........................................................................................14
7. REPLACEMENT PARTS
7.1 Replacement Parts................................................................................................15
7.2 Correspondence and Ordering Spare Parts..........................................................15
7.3 Recommended Spare Parts ..................................................................................16

PTV MANUAL ii 118012-001 REV B
8. FACTORY SERVICE
8.1 Warranty Repairs.................................................................................................17
8.2 Factory Service Procedures .................................................................................17
8.3 Ordering Options and Modifications...................................................................17
8.4 Shipping Instructions...........................................................................................17
APPENDIX
A. Specification Controls (Custom Models Only)

PTV MANUAL 1 118012-001 REV B
Chapter 1
INTRODUCTION
1.1 Description of the PTV Series
he PTV series of high voltage power supplies
provides very well regulated, low ripple high voltage
in a highly efficient, compact design. The
dramatically reduced size of the PTV Module, compared
to traditional high voltage modules, is obtained by a state
of the art off-line resonant converter. The resonant
converter utilizes a unique control scheme, which allows
constant frequency operation while maintaining high
efficiency. The high efficiency is obtained by zero
current switching (ZCS) resonant control. High operating
frequency, typically 60KHz, allows for very low ripple
and excellent dynamic response capabilities.
The DC output voltage and current are controllable over
the full range of operation. Monitoring and control
signals are provided for simple, yet flexible control of the
power supply. The PTV series operates from 115VAC
+/- 10%, or 220VAC +/- 10%, at 50/60 Hz single phase.
(User should specify input voltage at time of ordering).
The PTV series operates at 200W continuous without the
need for forced air cooling. The ambient temperature
must be kept below the maximum rating as specified in
1.2. Consult Spellman Sales Department for higher
power capabilities of the PTV series (up to 600W peak).
The standard warranty applies to the PTV modules.
Consult factory about the warranty for custom PTV
modules.
1.2 PTV Specifications
Output Control: Voltage and current are externally
programmable over the entire range from zero to
maximum rating via 0-10VDC reference or
potentiometer. (Other scale factors for control and
monitoring can be provided i.e. 1 volt per 10KV, 1
volt per 10mA etc.).
Input Voltage: 115Vac10%, 50/60Hz, single
phase. (220VAC 10%, 50/60Hz, single phase,
internally switchable). Consult factory for other than
115VAC input voltage.
Voltage Regulation:
Load Regulation: 0.01% of full voltage for a no
load to full load change.
Line Regulation: 0.01% of full voltage over the
specified input voltage range.
Current Regulation:
Load Regulation: 0.05% 25uA from 0 voltage to
full voltage.
Line Regulation: 0.01% of full current over the
specified input voltage range.
Ripple: 0.1% p-p of output voltage.
Polarity: Positive and Negative polarity with respect
to ground. (Specify at time of ordering).
Stability: 0.02% per hour after 1/2 hour warm up.
Temperature Coefficient: 150 ppm per C.
Temperature:
Operating: 20C to +50C
Storage: -40C to +80
Monitoring:
0-10VDC corresponding to 0-100% of output
voltage.
1-10VDC corresponding to 0-100% of output
current.
(Other scale factors available).
Control: Logic level control for high voltage
enable/disable.
IMPORTANT
This control signal in not a safety
interlock and should not be used for
protection from high voltage generation
for safety purposes.
T

PTV MANUAL 2 118012-001 REV B
1.3 Standard Features
The PTV series incorporates several standard features
designed to optimize user operation.
Slow Start: Provides a gradual increase in high voltage
output until the maximum set point is reached. Various
slow start times can be accommodated. Consult
Spellman’s Sales Department for information on slow
start options.
Overvoltage Protection: An overvoltage protection
circuit monitors the output for excessive voltage
generation. Overvoltage conditions can be caused by
excessive input program signal or an internal defect in the
control circuits. If an overvoltage condition is detected,
the power supply is latched off until input power is reset.
Overvoltage Indication: An open collector signal is
provided to give the user an indication that an overvoltage
condition occurred.
Internal EMI Filter and Fuse Protection: An internal
EMI filter and fuse provide protection against line voltage
surges and power supply faults.
1.3.1 Remote Operating Features
Remote Programming: Allows remote adjustment of
the output voltage and current via an external voltage
source.
Remote Monitor: Allows remote monitoring of the
Output voltage and current.
High Voltage Enable/Disable: Allows remote ON/OFF
control of the high voltage.
+10VDC Reference: A +10VDC reference is provided
for remote programming via a potentiometer or resistive
divider.
1.4 Options
The options available are listed in Table 1.1. See section
5 for more information on the options along with
operating and set-up instructions. With few exceptions,
these options can be retrofitted to your power supply at
the factory in a short time. For price and retrofit
arrangements, contact the Spellman Sales Department.
CODE DISCRIPTION
• FG Floating Ground
• 220 220VAC Single Phase Input
• NSS No Slow Start
• SS(X) Non-Standard Slow Start
• LL(X) Extra Length Output Cable
• Output Connector
• Focus Outputs
• Grid Outputs
1.5 Interpreting the Model
Number:
The model number of the power supply
describes its capabilities. After the series name
is:
(1) The maximum voltage in kilovolts.
(2) The polarity of the output – positive (P),
or negative (N).
(3) The maximum output in watts.
PTV 30 P 200/ FG / X(#)
Series
Name
Voltage
Maximum
Polarity Option
"X" Number
Custom
Power
Maximum
(4) The option code for all options that are
included.
(5) Custom “X” number representing details
listed in a separate specification control
drawing.

PTV MANUAL 3 118012-001 REV B
Chapter 2
Inspection and Installation
nitial inspection and preliminary checkout
procedures are recommended. For safe
operation, please follow the step-by-step
procedures described in Chapter 3, Operating
Instructions.
2.1 Initial Inspection
Inspect the package exterior for evidence of
damage due to handling in transit. Notify the
carrier and Spellman immediately if damage is
evident. Do not destroy or remove any of the
packing material used in a damaged shipment.
After unpacking, inspect the panel and chassis
for visible damage.
Fill out and mail the Warranty Registration card
accompanying the unit. Standard PTV200 high
voltage power supplies and components are
covered by warranty. Custom and special order
models (with an X suffix in the model number)
are also covered by warranty.
2.2 Mechanical Installation
The PTV series module power supplies are
designed for installation into existing or newly
developed OEM equipment. The power supply
can also easily fit into bench top applications or
test set requirements. Standard unit dimensions
are shown in Figure 2.1
For custom mounting requirements or specific
package size requirements consult Spellman’s
Sales Department. Spellman has many package
designs available, or can design a specific
enclosure for your requirements.
The PTV series utilizes solid encapsulations for
corona free operation. No periodic maintenance
is required. Lower voltage units (under 6KV)
utilize air insulation. Due to conservative
voltage spacing design, periodic maintenance is
not required.
I

PTV MANUAL 4 118012-001 REV B
.500" TYP
B
J2
T 4A/250V - 115V
T 2A/250V - 230V
J1
J3
Danger Label
Identification Label
FUSES
.500" TYP
8.00" TYP
1.50"
TYP
.
750
A
AMP: LGH4I Conn.
High Voltage Output
or Flying Lead 24"
(Customer Specified)
IEC 320 TYPE
AC Connector
Line Filter / Fuse
115VAC Input
(220VAC Optional) Pin No. 1
Signal Input Conn.
Molex: 03-09-2091
(9 Position Plug)
All Mounting Dimensions
Are Typical For Right Side
Heatsink
Max kV A B C
1-40kV 10.00 10.00 3.19
50-60kV 10.87 10.50 4.19
J2
TABLE 2.1 J2 WIRING
Pin No. FUNCTION
1 +10.35Volts
Current Program2Voltage Monitor3Voltage Program4Common Ground5Current Monitor6Enable7OVP Indicator8Control and Monitor RTN9
J2
Pin No.
Orientation
1
4
78
5
2
9
6
3
.50"
TYP
C
HAUPPAUGE, NY 11788 MADE IN USA
HIGH VOLTAGE ELECTRONICS CORP
6-32 Threaded
.50"
TYP
Inserts (16 Places)
Figure 2.1 Unit Dimensions

PTV MANUAL 5 118012-001 REV B
Chapter 3
Operating Instructions
3.1 Operation
WARNING
THIS EQUIPMENT GENERATES
DANGEROUS VOLTAGES THAT MAY BE
FATAL. PROPER GROUNDING OF ALL HIGH
VOLTAGE EQUIPMENT IS ESSENTIAL.
IMPORTANT:
Before connecting the power supply to the
AC line, follow this step-by-step procedure.
Do not connect the power supply to the AC
line until Step G is reached.
Failure to follow these procedures may void
the warranty.
A) Insure that the high voltage cable is properly
terminated to the load. Insure that all circuits connected
to the high voltage output are safely interlocked against
accidental contact. Insure external load is discharged.
B) Check the input voltage rating on the serial
nameplate of the supply and make certain that this is the
rating of the available power source. PTV modules
operate on 115VAC unless ordered with a different input
voltage option.
C) PROPER GROUNDING TECHNIQUE: The
chassis of high voltage power supplies must be grounded,
preferably to a water system ground using copper pipe or
other earth ground. See Figure 3.1 for a typical operating
setup. The return line from the load should be connected
to the power supply chassis. Using a separate external
ground at the load is not recommended. An IEC 320
connector is provided for connection to the line voltage
source. A standard three prong line cord is also provided.
D) Options Note : See section 5 for hook up and
operating instructions for the options on your unit.
Custom models may also require set up changes.
E) Hook-up: Connect control and monitoring
connections as described in this manual.
F) For initial turn-on, program the voltage and
current for zero output. Connect the enable/disable signal
to disable.
G) The input power cable may now be connected to
the AC power line.
H) Enable the power supply via the enable/disable
logic signal.
I) Slowly program the output voltage and current
to desired level. Monitor the output voltage and current
via the monitoring test points. Note equipment operation
is normal, i.e. Load is behaving as predicted.
J) To turn high voltage off, use the enable/disable
signal. If equipment is to be kept off for extended
periods, disconnect power supply from line voltage
source.
Note: If an over voltage condition occurs, the power
supply will latch off. To reset the power supply, remove
the line voltage and reconnect.
WARNING
AFTER TURNOFF, DO NOT HANDLE THE LOAD
UNTIL THE CAPACITANCE HAS BEEN
DISCHARGED!
LOAD CAPACITANCE MAY BE DISCHARGED BY
SHORTING TO GROUND.
WARNING
THE VOLTAGE MONITOR ON THE POWER
SUPPLY FRONT PANEL DOES NOT READ THE
OUTPUT VOLTAGE WHEN THE POWER IS
TURNED OFF, EVEN IF A CHARGE STILL
EXISTS ON THE LOAD.
CAUTION
ALWAYS OPERATE THE UNIT WITH THE COVER
ON. DO NOT ATTEMPT TO ACCESS OR REPAIR
ANY INTERNAL CIRCUITS. DANGEROUS AND
LETHAL VOLTAGES ARE GENERATED INSIDE
THE MODULE.

PTV MANUAL 6 118012-001 REV B
PROGRAMMING AND
CONTROL
J2
J1
J3
FUSES
HIGH VOLTAGE OUTPUT
HIGH
VOLTAGE
LOAD
SIGNAL
MONITORING I/O
6-32 THREADED INSERT
CAN BE USED FOR
LOAD TERMINATION
IEC 320
LINE CORD PROVIDED
±10%, 50/60Hz
(OTHER VOLTAGES
115VAC INPUT
AVAILABLE)
LINE INPUT
HAUPPAUGE, NY 11788 MADE IN USA
HIGH VOLTAGE ELECTRONICS CORP
Figure 3.1 Typical Operating Set Up
3.2 Standard Features
A note on remote interface circuitry and remote signal
grounding. Whenever possible, electrical isolation should
be provided when interfacing with any high voltage
power supply. For enable/disable signal connections, an
isolated relay or optocoupler should be used. For OVP
indication an LED or optocoupler should be used. If
possible, analog programming and monitoring signals
should be isolated via analog isolation amplifiers.
Spellman application engineers are available to assist in
interface circuitry design. All interface cables should be
properly shielded. All power supply signals should be
referenced to the power supplies signal ground or power
supply chassis ground
REMOTE PROGRAMMING: Allows remote
adjustment of the output voltage and current via an
external voltage source. 0-10VDC signal is supplied to
Pin 4 of the control input connector for voltage
programming and 0-10 VDC signal is supplied to Pin 2 of
the control input connector for current programming.
Programming signals should be referenced to Pin 9 of the
control input connector signal ground. By adjusting the
voltage source from 0 volts (zero output) to 10 volts (full
rated output) the desired output can be selected. See
Figure 3-2 A for wiring diagram and specifications.
An alternate method of controlling the output remotely is
by using external resistance such as a potentiometer or a
resistor network. See Figure 3.2B for wiring diagram.
Remote Monitoring: Test points are made available for
monitoring the voltage and current output. The test
points are always positive regardless of the output
polarity, where zero (0) to 10 (10) volts equals 0-100% of
output. See Figure 3.3 for test point wiring.
Enable/Disable Control: Remote control of the high
voltage on and high voltage off can be done via the
enable/disable logic control. See Figure 3.4 for
recommended interface circuits.
WARNING
It is extremely dangerous to use this
circuit to inhibit high voltage generation
for the purpose of servicing or
approaching any area of load considered
unsafe during normal use.
OVP Indicator/Power Supply On Indicator: A logic
signal is provided which can be used to determine if the
OVP Shutdown Circuit is active, and/or if the power
supply is ON. See Figure 3.5

PTV MANUAL 7 118012-001 REV B
10 MEG
4
9
PS COMMON
VOLTAGE CONTROL
CURRENT CONTROL
J2
0-10VDC = 0-100% OUTPUT
V
-
+
PS COMMON
10 MEG
9
-
J2
2
0-10VDC = 0-100% OUTPUT
V
+
Figure 3.2A Remote Programming Via Voltage Source
____________________________________________________________________________________
10 MEG
4
9
PS COMMON
VOLTAGE CONTROL
FULLY COUNTER-CLOCKWISE = 0
CURRENT CONTROL
>
-20k
CW
1
J2
100 OHM
+10.35V
FULLY CLOCKWISE = 100% OUTPUT
10 MEG
PS COMMON
+10.35V
100 OHM
9
FULLY COUNTER-CLOCKWISE = 0
FULLY CLOCKWISE = 100% OUTPUT
2
1
J2
CW
>
-20k
Figure 3.2B Remote Programming Via External Resistance

PTV MANUAL 8 118012-001 REV B
3
J2
9
PS COMMON
M-
+
VOLTAGE MONITOR
10k OHM
0-10VDC = 0-100% OUTPUT VOLTAGE
PS COMMON
10k OHM
9
0-10VDC = 0-100% OUTPUT CURRENT
6+M-
CURRENT MONITOR
Figure 3.3 Remote Monitoring
____________________________________________________________________________________
7
J2
5
PS COMMON
10k OHM
NOT TO BE USED FOR SAFETY INTERLOCK
OR SAFETY RELATED HV SHUTDOWN
CLOSED = HV OFF
OPEN = HV ON
THE LOGIC FOR HV ON CAN BE INVERTED
BY SELECTING INTERNAL JUMPERS.
CONSULT FACTORY FOR ALTERNATE LOGIC
SW1
+5V
SUCH AS THE TRANSISTOR OUTPUT OF AN OPTOCOUPLER.
NOTE: SW1 CAN BE A SWITCH, RELAY OR OPEN COLLECTOR DEVICE
Figure 3.4 HV ON/OFF Control

PTV MANUAL 9 118012-001 REV B
8
J2
5
PS COMMON
1k OHM
LED ON = POWER SUPPLY ON (NO OVP)
+5V
(OR LACK THERE OF) OF HIGH VOLTAGE
NOTE: NOT TO BE USED FOR SAFETY INDICATION FOR THE PRESENCE
TRANSISTOR
ON =
OVP LATCHED
Figure 3.5 OVP / Power Supply On Indicator

PTV MANUAL 10 118012-001 REV B
Chapter 4
PRINCIPLES OF OPERATION
he PTV Series of high voltage power supplies utilizes
sophisticated power conversion technology.
Advanced analog and power conversion techniques
are used in the PTV series. The intention of the
Principles of Operation is to introduce the basic function
blocks that comprise the PTV power supply. For details
on a specific circuit, consult Spellman’s Engineering
Department.
The PTV power supply is basically an AC to DC power
converter. Within the power supply, conversions of AC
to DC then to high frequency AC, then to high voltage
DC take place.
Typical PTV power supplies comprise a few basic
building blocks. These are: 1) AC to DC rectifier,
2) High frequency quasi-resonant inverter, 3) High
voltage transformer and rectifier circuits, and 4) Control
and monitoring circuits. The following is a brief
description of each building block.
4.1 AC to DC Rectifier and
Associated Circuits
The PTV series can operate from 115VAC +/- 10% or
220VAC +/- 10%. (Alternate input voltage ranges can be
accommodated. Consult Spellman’s Sales Department
for details).
The input voltage is connected via a typical IEC 320 type
input connector. An internal EMI filter and fuse housing
is an integral part of the IEC input module.
WARNING
To reduce the risk of fire, replace fuse
with same type and rating.
The input line voltage is applied to a current limit device
to reduce the initial inrush current. The input line voltage
is converted to a 300VDC voltage via a bridge
rectifier/capacitor filter circuit.
On newer PTV modules a 300VDC indicator neon lamp
is provided inside the unit to indicate the presence of
voltage.
The input AC line voltage is also connected to a step-
down transformer, which is used to generate +/- 24VDC,
+/- 15VDC, and 10VDC via low voltage regulators.
WARNING
The energy levels used and generated by the
power supply can be lethal! Do not attempt to
operate the power supply unless the user has a
sufficient knowledge of the dangers and hazards
of working with high voltage. Do not attempt to
approach or touch any internal or external
circuits or components that are connected or
have been connected to the power supply. Be
certain to discharge any stored energy that may
be present before and after the power supply is
used. Consult IEEE recommended practices for
safety in high voltage testing #510-1983.
4.2 High Frequency Inverter
The PTV is a resonant converter operating in a zero
current switching, series resonant, parallel loaded
topology. MOSFET transistors switch the 300 VDC
voltage to the resonant tank circuit. Typical operating
frequency is in the range of 35-65KHz depending on
model. Control of the resonant circuit output is done by
the low voltage control circuits, and are isolated by an
isolated pulse transformer. The output of the resonant
circuit is applied to the primary of the high voltage
transformer.
4.3 High Voltage Circuits
The high voltage transformer is a step-up type. The
secondary of the high voltage transformer is connected to
the high voltage rectifier circuit. The rectifier circuit will
vary depending upon the rated output voltage. For lower
output voltage, a full bridge or doubler circuit is used.
For higher voltages, a half wave Cockroft-Walton
multiplier is used. A feedback signal is generated by the
high voltage resistor divider. This feedback signal is sent
to control circuits to provide voltage regulation and
monitoring. A current sense resistor is connected at the
low voltage end of the rectifier circuit. The circuit sense
signal is sent to the control circuits to provide current
regulation and monitoring.
An auxiliary voltage sense signal is generated by the
overvoltage protection feedback resistor. This is used to
provide overvoltage protection.
T

PTV MANUAL 11 118012-001 REV B
The high voltage rectifier output is connected to an R-C
type filter to reduce high frequency ripple components.
The filter is then connected to the output limiting
resistors. These resistors limit the peak surge current in
the event an arc or discharge occurs. The limiting resistor
output is connected to the output cable or connector
provided.
4.4 Control Circuits
Control circuits are used for regulation, monitoring,
pulse-width, control, slow-start and inhibit control.
Feedback signals are calibrated and buffered via general
purpose OP-AMPS. Pulse width control is accomplished
by a typical PWM type control I.C. Logic enable/disable
is provided by a logic gate I.C. As stated previously,
regulators generate +/- 15V and 10VDC.
WARNING
LINE VOLTAGE IS PRESENT
WHENEVER THE POWER SUPPLY IS
CONNECTED TO EXTERNAL LINE
VOLTAGES. BE SURE TO DISCONNECT
THE LINE CORD BEFORE OPENING THE
UNIT. ALLOW 5 MINUTES FOR
INTERNAL CAPACITANCE TO
DISCHARGE BEFORE REMOVING ANY
COVER.
4.5 Options
Due to the variations of models and options provided in
the PTV series, details of actual circuits used may differ
slightly from above descriptions. Consult Spellman’s
Engineering Department for questions regarding the
principles of operations for the PTV series.