Spellman EPM Series, SMS Series Instruction Manual

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R
EPM/SMS SERIES
MODEL : SERIAL# : DATE :
SPELLMAN HIGH VOLTAGE ELECTRONICS CORPORATION
475 Wireless Blvd. Hauppauge, New York, 11788
+1(631) 630-3000*FAX: +1(631) 435-1620* E-mail: sales@spellmanhv.com Website: www.spellmanhv.com
High Voltage Power Supply
EPM/SMS MANUAL 118027-001 Rev G
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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.
SERVICESICHERHEIT
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.
118004-001 REV. B
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PRECAUTIONS IMPORTANTES POUR VOTRE SECURITE
CONSIGNES DE SÉCURITÉ
CETTE ALIMENTATION GÉNÈRE DES TENSIONS QUI SONT DANGEUREUSES ET PEUVENT ÊTRE FATALES.
OYEZ EXTRÊMENT VIGILANTS LORSQUE VOUS UTILISEZ CET ÉQUIPEMENT.
S
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.
CONSIGNES DE SÉCURITÉ EN CAS DE REPARATION
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.
118004-001 REV. B
Page 4
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
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EPM/SMS MANUAL i 118026-001 REV K

Table of Contents

PAGE
1. INTRODUCTION
1.1 Description of the EPM/SMS Series....................................................................1
1.2 EPM/SMS 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
2.3 Installation Instructions ........................................................................................6
3. OPERATING INSTRUCTIONS
3.1 Operation ..............................................................................................................7
3.2 Standard Features .................................................................................................8
4. PRINCIPLES OF OPERATION
4.1 High Frequency Inverter ......................................................................................15
4.2 High Voltage Circuits ..........................................................................................15
4.3 Control Circuits ....................................................................................................15
4.4 Options .................................................................................................................15
5. OPTIONS
5.1 Floating Ground ...................................................................................................16
5.2 24Vdc ...................................................................................................................16
5.3 No Slow Start .......................................................................................................16
5.4 Non-Standard Slow Start .....................................................................................16
5.5 Extra Length Output Cable ..................................................................................16
5.6 Custom Designed Models ...................................................................................16
6. MAINTENANCE
6.1 Periodic Servicing ................................................................................................18
6.2 Performance Test .................................................................................................18
6.3 High Voltage Dividers .........................................................................................18
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EPM/SMS MANUAL ii 118026-001 REV K
7. REPLACEMENT PARTS
7.1 Replacement Parts ................................................................................................19
7.2 Correspondence and Ordering Spare Parts ..........................................................19
8. FACTORY SERVICE
8.1 Warranty Repairs .................................................................................................20
8.2 Factory Service Procedures ..................................................................................20
8.3 Ordering Options and Modifications ...................................................................20
8.4 Shipping Instructions ...........................................................................................20
APPENDIX
A. Specification Controls (Custom Models Only)
LIST OF FIGURES
2.1 EPM Module Dimensions ....................................................................................4
2.2 SMS Module Dimensions ....................................................................................5
3.1 SMS Typical Operating Set Up ...........................................................................9
3.2 EPM Typical Operating Set Up ...........................................................................9
3.2A SMS Remote Programming via Voltage Source ..................................................10
3.2B SMS Remote Programming via External Resistance ...........................................10
3.3 SMS Remote Monitoring .....................................................................................11
3.4A SMS HV ON/OFF Enable (Low) Control ...........................................................11
3.4B SMS HV ON/OFF Enable (Hi) Control ...............................................................12
3.5A EPM Remote Programming via Voltage Source .................................................12
3.5B EPM Remote Programming via External Resistance ..........................................13
3.6 EPM Remote Monitoring .....................................................................................13
3.7A EPM HV ON/OFF Enable (Low) Control ...........................................................14
3.4B SMS HV ON/OFF Enable (Hi) Control ...............................................................14
5.1 Floating Ground Interface Circuit ........................................................................17
LIST OF TABLES
1.1 Options .................................................................................................................2
2.1 Output Voltage and Current ................................................................................6
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EPM/SMS MANUAL 1 118026-001 REV K
Chapter 1
INTRODUCTION
1.1 Description Of The EPM/SMS Series
he EPM/SMS 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 these modules 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. High operating frequency 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 EPM/SMS series operates from 24VAC ±10% or 28Vdc ±10%. (The user should specify the input voltage at the time of order). The EPM series operates at 30W continuous and the SMS series operates at 60W continuous. Neither series requires 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 EPM/SMS series.
The standard warranty applies to the EPM/SMS series modules. Consult factory about the warranty for custom modules.
1.2 EPM/SMS 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: 28Vdc ±10%, 28Vdc ±10% optional.
(Consult the factory for other input voltages.)
Current: 5A max. on SMS models, 3A max. on
EPM models.
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 or Negative polarity with respect to ground. (Specify at time of ordering).
Stability:
0.01% per hour after 1/2 hour warm up.
Temperature Coefficient:
100 ppm per C.
Temperature:
Operating: -20C to -40C Storage: -40C to +80
Monitoring:
0 to 10VDC corresponding to 0 to 100% of output voltage 0 to 10VDC corresponding to 0 to 100% of output current. (Other scale factors available).
Control:
Control signal for high voltage enable/disable.
Environmental:
Indoor use Altitude up to 2000 meters 80% max. rel. humidity for temperatures up to 31ºC, decreasing linearly to 50% rel. humidity at 40ºC. Pollution degree 2 (IEC664)
T
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EPM/SMS MANUAL 2 118026-001 REV K
IMPORTANT
This control signal in not a safety
interlock and should not be used for
protection from high voltage generation
for safety purposes.
1.3 Standard Features
The EPM/SMS 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 the
Spellman’s Sales Department for information on slow
start options. (The slow start time will be a function of set point, input voltage and load conditions).
Overvoltage Protection: SMS series only. An overvoltage protection circuit monitors the output for excessive voltage generation. Overvoltage conditions can be caused by an 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.
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
24 24Vdc Input
NSS No Slow Start
LL(X) Extra Length Output Cable
• Output Connector
Table 1.1 Options
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 KV). (2) The polarity of the output – positive (P), negative
(N).
(3) The maximum output (in watts). (4) The option code for all options that are included. (5) Custom “X” number representing details listed in
a separate specification control drawing.
EPM/SMS 30 P 60 / FG / X(#)
Series Name
Voltage
Maximum
Polarity
Option
"X" Number
Custom
Power
Maximum
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EPM/SMS MANUAL 3 118026-001 REV K
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 EPM/SMS 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 EPM/SMS 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 EPM/SMS 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
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EPM/SMS MANUAL 4 118026-001 REV K
PIN
FUNCTION
1
Ground
2
+28Vdc
3
High Voltage Enable/Inhibit
4
Voltage Test Point: 10V±2% = 0 to Rated Output
5
Current Test Point: 10V±2% = 0 to Rated Output
6
Voltage Programming
7
Current Programming
8
+10.24Vdc Reference
9
Program and Test Point Return
Note: If Enable/Inhibit is not used, connect Pin 3 to Pin 8.
Remote Programming: Permits remote adjustment of the output voltage
and current via an external voltage source. By adjusting the voltage source from 0V to 10V the desired output may be selected.
Remote Monitor:
Test points, pins 4 and 5 of the input connector, monitor voltage and current outputs. The output polarity is positive from 0V to 10V equal to 0 to 100% of the output ±0.5%. Output impedance is 1k Ohms.
High Voltage Enable/Inhibit:
Control signal which allows the user to inhibit the power supply output without switching the HIGH VOLTAGE OFF. See Figures 3.7A and
3.7B.
Figure 2.1 EPM Module Dimensions
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EPM/SMS MANUAL 5 118026-001 REV K
PIN
FUNCTION
1
Ground
2
+28Vdc
3
High Voltage Enable/Inhibit
4
Voltage Test Point: 10V±2% = 0 to Rated Output
5
Current Test Point: 10V±2% = 0 to Rated Output
6
Voltage Programming
7
Current Programming
8
+10.24Vdc Reference
9
Program and Test Point Return
10
Not Used
11
Not Used
12
Not Used
Remote Programming: Permits remote adjustment of the output voltage and
current via an external voltage source. By adjusting the voltage source from 0V to 10V the desired output may be selected.
Remote Monitor:
Test points, pins 4 and 5 of the input connector, monitor voltage and current outputs. The output polarity is positive from 0V to 10V equal to 0 to 100% of the output ±0.5%. Output impedance is 1k Ohms.
High Voltage Enable/Inhibit:
Control signal which allows the user to inhibit the power supply output without switching the HIGH VOLTAGE OFF. See Figures 3.4A and 3.4B.
Figure 2.2 SMS Module Dimensions
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EPM/SMS MANUAL 6 118026-001 REV K
2.3 Installation Instructions
The following are installation instructions for the below listed models. They are approved in accordance with EN60950:1993/AM1:1993/AM2:1993 and EN61010­1:1993. If installed in information technology equipment, the installation must comply with the above standard.
The unit must be fused by an external 5A fuse.
The unit is convection cooled.
The maximum permitted temperature of the air
surrounding the power supply is 40ºC.
The chassis of the power supply should be suitably
connected to Protective Earth.
Model
Output Voltage
Output Power
SMS20X60
20kV/3mA
60W
SMS30X60
30kV/2mA
60W
SMS40X60
40kV/1.5mA
60W
SMS50X60
50kV/1.2mA
60W
SMS60X60
60kV/1mA
60W
Table 2.1
Output Voltage and Current Ratings for
24Vdc or 28Vdc /5A Models
Dieses Geraet ist zugelassen gemaess EN60950:1993/AM1:1993/AM2:1993 and EN61010­1:1993. Im falle das diesses Geraet in Informationstechnik-einrichtung eingegaut werden soll, die installation muss gemaess den obengenannten Norn erfolgen.
Das Garaet muss externe fliken Sicherungen
Gesichert sein: 5A
Kuehlung ohne Luefter.
Maximale zugelassene Lufttemperature un den
Schaltnetsteil: 40ºC.
Eine angemessene Verbindung zwischen den
Metallrahmen des Netzteiles und Schutzerde muss erstellt stein.
Model
Ausgaenge
Output Power
SMS20X60
20kV/3mA
60W
SMS30X60
30kV/2mA
60W
SMS40X60
40kV/1.5mA
60W
SMS50X60
50kV/1.2mA
60W
SMS60X60
60kV/1mA
60W
Table 2.1
Nennwerte
24Vdc oder 28Vdc /5A
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EPM/SMS MANUAL 7 118026-001 REV K
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. EPM/SMS modules operate on 28Vdc unless ordered with a different input voltage option. External fusing is required for the DC input power. For the EPM/SMS series a 3A type fuse shall be used. The SMS series uses a 5A fuse.
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.
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, open the interlock.
G) The DC input power may now be connected. 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 the DC INPUT source.
Note: (SMS ONLY) 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.
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EPM/SMS MANUAL 8 118026-001 REV K
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. 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. A 0 to 10VDC signal is supplied to Pin 6 of the control input connector for voltage programming. A 0 to 10 VDC signal is supplied to Pin 7 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 3.2A and 3.5B 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 and 3.5B 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 the output. See Figure 3.3 and 3.6 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 control. See Figure 3.4 and 3.7 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.
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EPM/SMS MANUAL 9 118026-001 REV K
Figure 3.1 SMS Typical Operating Set Up
Figure 3.2 EPM Typical Operating Set up
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EPM/SMS MANUAL 10 118026-001 REV K
Figure 3.2A SMS Remote Programming Via Voltage Source
____________________________________________________________________________________
Figure 3.2B SMS Remote Programming Via External Resistance
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EPM/SMS MANUAL 11 118026-001 REV K
Figure 3.3 SMS Remote Monitoring
____________________________________________________________________________________
Figure 3.4A SMS HV ON/OFF Enable (Low) Control
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EPM/SMS MANUAL 12 118026-001 REV K
Figure 3.4B SMS HV ON/OFF Enable (Hi) Control
____________________________________________________________________________________
Figure 3.5A EPM Remote Programming Via Voltage Source
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EPM/SMS MANUAL 13 118026-001 REV K
Figure 3.5B EPM Remote Programming Via External Resistance
____________________________________________________________________________________
Figure 3.6 EPM Remote Monitoring
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EPM/SMS MANUAL 14 118026-001 REV K
Figure 3.7A EPM HV ON/OFF Enable (Low) Control
____________________________________________________________________________________
Figure 3.7B EPM HV ON/OFF Enable (Hi) Control
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EPM/SMS MANUAL 15 118026-001 REV K
Chapter 4
PRINCIPLES OF OPERATION
he EPM/SMS Series of high voltage power supplies utilizes sophisticated power conversion technology.
Advanced analog and power conversion techniques are used in the EPM/SMS series. The intention of the Principles of Operation is to introduce the basic function blocks of the EPM/SMS series power supply. For details on a specific circuit, consult Spellman’s Engineering Department.
The EPM/SMS series power supply is basically an DC to DC power converter. Within the power supply, conversions of DC to high frequency AC, then to high voltage DC take place.
Typical EPM/SMS series power supplies comprise a few basic building blocks. These are: 1) High frequency quasi-resonant inverter, 2) High voltage transformer and rectifier circuits, and 3) Control and monitoring circuits. The following is a brief description of each building block.
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.
4.1 High Frequency Inverter
The EPM/SMS series uses a resonant converter operating in a zero current switching, resonant flyback and forward converter topology. MOSFET transistors switch DC voltage to the resonant circuit. Typical operating frequency is in the range of 30-35kHz depending on model. Control of the resonant circuit output is done by
the low voltage control circuits. The resonant circuitry consists of a resonant inductor and step-up transformer.
4.2 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.
In the SMS series, an auxiliary voltage sense signal is generated by the overvoltage protection feedback resistor. This is used to provide overvoltage protection.
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 occurring. The limiting resistor output is connected to the output cable or connector provided.
4.3 Control Circuits
Control circuits are used for regulation, monitoring, pulse­width, 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. Regulators generate +/- 15V and 10VDC.
4.4 Options
Due to the variations of models and options provided in the EPM/SMS 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 EPM/SMS.
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EPM/SMS MANUAL 16 118026-001 REV K
Chapter 5
OPTIONS
He options available for this power supply are
described in this section. Interface diagrams are
shown where required. Options are specified by including the option code in the model number as described in Section 1.4.
5.1 Floating Ground FG
The floating ground option allows isolation of the power supply common from chassis ground. A typical application for FG is for connection of an external meter or circuit into the FG signal point. This circuit can monitor actual current flow at a low voltage level. See Figure 5.1 for typical connection to the floating ground terminal.
IMPORTANT
The power supply common must be
connected to chassis ground through a
low impedance circuit. The power
supply common is clamped to chassis
ground using a power zener diode. This
diode is not intended to clamp under
continuous operation. On higher
current units the power dissipation
within the zener diode can be excessive
if allowed to clamp.
5.2 24Vdc 24
EPM/SMS series power supplies with the 24Vdc input option will operate from an input voltage of 24Vdc±10%
5.3 No Slow Start NSS
The no slow start option causes the output voltage of the power supply to rise (within 500 msec) to the rated voltage upon Power Up.
5.4 Non-Standard Slow Start SS(x)
The non-standard slow start option allows the gradual rise time of the output voltage to be different from the standard of six seconds. To order the option, place the time desired in seconds after the suffix letter; i.e. SS(10) denotes a 10 second rise time.
5.5 Extra Length Output Cable LL(ft)
Standard output cable is 18” long. Other lengths may be specified.
5.6 Custom Designed Models X(#)
Units built to customer specifications are assigned an X number be the factory. If this unit is an X model, specification control sheet is added at the end of this instruction manual.
Spellman welcomes the opportunity to tailor its units to fit your requirements or to develop new products for your applications. Contact the Spellman Sales Department with your needs.
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EPM/SMS MANUAL 17 118026-001 REV K
Figure 5.1 Floating Ground Interface Circuit
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EPM/SMS MANUAL 18 118026-001 REV K
Chapter 6
MAINTENANCE
his section describes periodic servicing and
performance testing procedures.
THIS POWER SUPPLY GENERATES VOLTAGES
THAT ARE DANGEROUS AND MAY BE FATAL.
OBSERVE EXTREME CAUTION WHEN WORKING
WITH HIGH VOLTAGE.
6.1 Periodic Servicing
The EPM/SMS series does not require periodic maintenance or servicing.
6.2 Performance Test
HIGH VOLTAGE IS DANGEROUS.
ONLY QUALIFIED PERSONNEL SHOULD
PERFORM THESE TESTS.
High voltage test procedures are described in Bulletin STP-783, Standard Test Procedures for High Voltage Power Supplies. Copies can be obtained from the Spellman Customer Service Department. Test equipment, including an oscilloscope, a high impedance voltmeter, and a high voltage divider such as the Spellman HVD-100 or HVD-200, is needed for performance tests. All test components must be rated for operating voltage.
6.3 High Voltage Dividers
High voltage dividers for precise measurements of output voltage with an accuracy up to 0.1% are available from Spellman. The HVD-100 is used for voltages up to 100KV. The HVD-200 measures up to 200KV. The Spellman divider is designed for use with differential voltmeters or high impedance digital voltmeters. The high input impedance is ideal for measuring high voltage low current sources, which would be overloaded by traditional lower impedance dividers.
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WARNING
WARNING
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EPM/SMS MANUAL 19 118026-001 REV K
Chapter 7
REPLACEMENT PARTS
7.1 Replacement Parts
Pellman provides parts and assemblies for its high voltage power supplies but recommends that only
qualified personnel perform the repair. High voltage is dangerous; even minor mistakes in repairs can have serious consequences.
When requesting parts please give the model number and serial number of the power supply.
7.2 Correspondence and
Ordering Spare Parts
Each power supply has an identification label on the rear of the chassis that bears its model and serial number. When requesting engineering or applications information, please state the model and serial number of the power supply. If specific components or circuit sections are involved in the inquiry, it is helpful to indicate the component symbol number(s) shown on the applicable schematic diagram.
When ordering spare parts, please specify the part’s description, the part’s reference designation or part
number, and the model and serial number of the unit.
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EPM/SMS MANUAL 20 118026-001 REV K
Chapter 8
FACTORY SERVICE
8.1 Warranty Repairs
During the Warranty period, Spellman will repair all units free of charge. The Warranty is void if the unit is worked on by other than Spellman personnel. See the Warranty in the rear of this manual for more information. Follow the return procedures described in Section 8.2. The customer shall pay for shipping to and from Spellman.
8.2 Factory Service Procedures
Spellman has a well-equipped factory repair department. If a unit is returned to the factory for calibration or repair, a detailed description of the specific problem should be attached.
For all units returned for repair, please obtain an authorization to ship from the Customer Service Department, either by phone or mail prior to shipping. When you call, please state the model and serial numbers, which are on the plate on the rear of the power supply, and the purchase order number for the repair. A Return Material Authorization Code Number (RMA Number) is needed for all returns. This RMA Number should be marked clearly on the outside of the shipping container. Packages received without an RMA Number will be returned to the customer. The Customer shall pay for shipping to and from Spellman.
A preliminary estimate for repairs will be given by phone by Customer Service. A purchase order for this amount is requested upon issuance of the RMA Number. A more detailed estimate will be made when the power supply is received at the Spellman Repair Center. In the event that repair work is extensive, Spellman will call to seek additional authorization from your company before completing the repairs.
8.3 Ordering Options and Modifications
Many of the options listed in Chapter 5 can be retrofitted into Spellman power supplies by our factory. For prices and arrangements, contact the Spellman Sales Department.
8.4 Shipping Instructions
All power supplies returned to Spellman must be sent shipping prepaid. Pack the units carefully and securely in a suitable container, preferably in the original container, if available. The power supply should be surrounded by at least four inches of shock absorbing material. Please return all associated materials, i.e. high voltage output cables, interconnection cables, etc., so that we can examine and test the entire system.
All correspondence and phone calls should be directed to: Spellman High Voltage Electronics Corp.
475 Wireless Boulevard Hauppauge, New York 11788 TEL: (631) 630-3000 FAX: (631) 435-1620 E-Mail: sales@Spellmanhv.com http://www.spellmanhv.com
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To obtain information on Spellman’s product warranty please visit our website at:
http://www.spellmanhv.com/en/About/Warranty.aspx
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