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KEPCO ATE 6-50 Operator's Manual

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OPERATOR MANUAL
ATE 3/4 RACK, FULL RACK SERIES
KEPCO INC.
An ISO 9001 Company.
IMPORTANT NOTES:
1)
This manual is valid for the following Model and associated serial numbers:
MODEL
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, (718) 461-7000, 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.
©2024, KEPCO, INC,
P/N 228-1726-r7
KEPCO, INC.  131-38 SANFORD AVENUE  FLUSHING, NY. 11355 U.S.A.  TEL (718) 461-7000  FAX (718) 767-1102
POWER SUPPLY
AUTOMATIC TEST EQUIPMENT
MODELS
3/4 Rack, 500W
ATE 6-50, ATE 15-25, ATE 25-20,
ATE 36-15, ATE 55-10, ATE 75-8,
ATE 100-5, ATE 150-3.5
Full Rack1000W
ATE 6-100, ATE 15-50, ATE 25-40,
ATE 36-30, ATE 55-20, ATE 75-15,
ATE 100-10, ATE 150-7
ORDER NO.
SERIAL NO.
email: hq@kepcopower.com  World Wide Web: /www.kepcopower.com
REV. NO.
REV. NO.
KEPCO
THE POWER SUPPLIER™
®

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  • Page 1 Data subject to change without notice. KEPCO ® ©2024, KEPCO, INC, P/N 228-1726-r7 THE POWER SUPPLIER™ KEPCO, INC.  131-38 SANFORD AVENUE  FLUSHING, NY. 11355 U.S.A.  TEL (718) 461-7000  FAX (718) 767-1102 email: hq@kepcopower.com  World Wide Web: /www.kepcopower.com...
  • Page 3 There are no user or operator serviceable parts within the product enclosure. Refer all servicing to qualified and trained Kepco service technicians. 228-1351 COND/CONFORM 022324...
  • Page 4 SAFETY INSTRUCTIONS 1. Installation, Operation and Service Precautions This product is designed for use in accordance with EN 61010-1 and UL 3101 for Installation Category 2, Pollution Degree 2. Hazardous voltages are present within this product during normal operation. The prod- uct should never be operated with the cover removed unless equivalent protection of the operator from accidental contact with hazardous internal voltages is provided: There are no operator serviceable parts or adjustments within the product enclosure.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS SECTION PAGE SECTION 1 - INTRODUCTION Scope of Manual ............................. 1-1 General Description..........................1-1 Options ..............................1-1 1.3.1 Digital Meters (DM Suffix):......................... 1-1 1.3.2 Analog Meters (M Suffix: ........................1-1 1.3.3 Locking Front Controls (L Suffix) ....................... 1-2 Specifications ............................
  • Page 6 TABLE OF CONTENTS SECTION PAGE 3.7.2.1 Using Preamp “A” and Internal Reference Source..............3-13 3.7.3 Voltage Control with a High Impedance Control Source..............3-15 Current Control Channel Programming ....................3-17 3.8.1 Output Current Control With An External 0 - 1 Volt d-c Control Signal..........3-17 3.8.2 Current Control with a Two-terminal Resistance ................
  • Page 7 LIST OF FIGURES FIGURE TITLE PAGE ATE 3/4 Rack and Full Rack Series Programmable Power Supply .............. vi Mechanical Outline Drawing, 3/4-Rack Models ..................1-10 Mechanical Outline Drawing, Full-Rack Models..................1-12 ATE Full-Rack, 3/4-Rack Series Front Panel....................2-2 ATE Full Rack, 3/4 Rack Series Rear Panel....................2-3 Rear Programming Connector Pin Functions .....................
  • Page 8 LIST OF TABLES TABLE TITLE PAGE ATE D-C Output Ratings and output impedance ..................1-2 ATE Series Specifications .......................... 1-2 ATE Dynamic Specifications, Resistive Load ..................... 1-5 ATE Static Specifications ........................... 1-6 Equipment Supplied ........................... 1-8 Accessories ..............................1-8 Safety Symbols ............................1-9 Front Panel Controls, Indicators and Terminations ..................
  • Page 10 ATE 3/4 RACK SERIES ATE FULL RACK SERIES FIGURE 1-1. ATE 3/4 RACK AND FULL RACK SERIES PROGRAMMABLE POWER SUPPLY (v blank)/vi ATE 022324...

  • Page 11: Section 1- Introduction

    This manual contains instructions for the installation, operation and maintenance of the ATE Full- Rack and 3/4-Rack series of voltage and current stabilized d-c power supplies, both M suf- fix (analog meter) and DM suffix (digital meter) manufactured by Kepco, Inc., Flushing, New York, U.S.A.

  • Page 12: Locking Front Controls (L Suffix)

    1.3.3 LOCKING FRONT CONTROLS (L SUFFIX) ATE Power Supplies with L suffix are equipped with locking-type screw-driver-adjustable controls in place of the front panel control knobs. For L option models, changing front panel settings require that the controls be unlocked first. SPECIFICATIONS Table 1-1 lists the output parameters applicable to individual models.
  • Page 13 TABLE 1-2. ATE SERIES SPECIFICATIONS (Continued) SPECIFICATION RATING/DESCRIPTION CONDITION OUTPUT CHARACTERISTICS d-c Output Series Pass Transistor Type of Stabilizer Automatic crossover Voltage/Current Voltage 0 to 100% of rating Adjustment range for temp 0 to +50°C Current 0-100% of rating Usable range limited to approximately 1% to 100%.
  • Page 14 TABLE 1-2. ATE SERIES SPECIFICATIONS (Continued) SPECIFICATION RATING/DESCRIPTION CONDITION GENERAL (ENVIRONMENTAL) CHARACTERISTICS Operating DM suffix 0 to +50°C No derating Temperature M Suffix 0 to +65°C Derate output power 10% at temperatures above +55°C. Storage DM suffix -20 to +70°C Temperature M Suffix -40 to +85°C Humidity...
  • Page 15 TABLE 1-3. ATE DYNAMIC SPECIFICATIONS, RESISTIVE LOAD PROGRAMMING BANDWIDTH PROGRAMMING TIME CONSTANT (FAST MODE) (FAST MODE) OUTPUT  (KHz) sec) VOLTAGE RATING Typical minimum Typical maximum 23.0 16.0 10.0 20.0 10.6 15.0 11.5 14.0 20.0 20.0 25.0 33.0 40.0 37.0 45.0 100V 60.0...

  • Page 16: Features

    TABLE 1-4. ATE STATIC SPECIFICATIONS OUTPUT EFFECTS VOLTAGE MODE OUTPUT EFFECTS CURRENT MODE OFFSETS INFLUENCE QUANTITY  I TYPICAL MAXIMUM TYPICAL MAXIMUM  <0.0005% E max. <0.001% E max. <0.002% max. <0.005% max. SOURCE VOLTAGE (min. - max.) <1nV <1 <0.001% E max.

  • Page 17: Current Channel (External)

    1.5.3 CURRENT CHANNEL (EXTERNAL) Output current may be controlled by means of a separate current channel, applying a 0 to 1V d-c control signal at the rear programming connector for control over the rated current range. This same channel, properly programmed, may control the output of the power supply, respond- ing to control and feedback voltages from temperature or pressure sensors, chemical reactions and the like.

  • Page 18: Equipment Supplied

    NOTES: (1) All Kepco Rack Adapters fit standard EIA rack dimensions. They are drilled for standard chassis slides and are provided with slide support brackets. (2) Filler panels to cover empty slots, if the adapter is not used to Its full capacity, are available.

  • Page 19: Safety

    There are no operator serviceable parts inside the case. Service must be referred to authorized personnel. Using the power supply in a manner not specified by Kepco. Inc. may impair the pro- tection provided by the power supply. Observe all safety precautions noted throughout this man- ual.
  • Page 20 FIGURE 1-2. MECHANICAL OUTLINE DRAWING, 3/4-RACK MODELS (SHEET 1 OF 2) 1-10 ATE OPER 022324...
  • Page 21 FIGURE 1-2. MECHANICAL OUTLINE DRAWING, 3/4-RACK MODELS (SHEET 2 OF 2) 1-11 ATE OPER 022324...
  • Page 22 FIGURE 1-3. MECHANICAL OUTLINE DRAWING, FULL-RACK MODELS (SHEET 1 OF 2) 1-12 ATE OPER 022324...
  • Page 23 FIGURE 1-3. MECHANICAL OUTLINE DRAWING, FULL-RACK MODELS (SHEET 2 OF 2) 1-13/(1-10 Blank) ATE OPER 022324...

  • Page 25: Section 2 - Installation

    SECTION 2 - INSTALLATION UNPACKING AND INSPECTION This instrument has been thoroughly inspected and tested prior to packing and is ready for operation. After carefully unpacking, inspect for shipping damage before attempting to operate. Perform the preliminary operational check as outlined in PAR. 2.5 below. If any indication of damage is found, file an immediate claim with the responsible transport service.
  • Page 26 TABLE 2-1. FRONT PANEL CONTROLS, INDICATORS AND TERMINATIONS FIGURE 2-1 CONTROL OR TERMINATION FUNCTION INDEX NO. A-C Power ON/OFF switch/circuit Serves as a-c power switch and turns a-c power off upon heatsink breaker overtemperature, output overvoltage detection or (if enabled) power loss.
  • Page 27 TABLE 2-2. REAR PANEL TERMINATIONS FIGURE 2-2 TERMINATION FUNCTION INDEX NO. Rear Programming Used to gain access to internal circuitry for fast mode conversion, remote program- Connector ming, flags, crowbar signals, troubleshooting and parallel/serial connections. See Figure 2-3 for details. Rear Panel Barrier Strip Nine terminals provided: 1, 7: C O (–) and C O (+) used to used access ATE output capacitor.
  • Page 28 ATE 022324...

  • Page 29: Source Power Requirements

    TABLE 2-3. INTERNAL CONTROLS AND THEIR FUNCTIONS REFERENCE CONTROL PURPOSE DESIGNATION O MAX Maximum Output Current E O LAG Voltage Channel Stability Control E O ZERO Voltage Channel Zero Control O ZERO Current Channel Zero Control PREAMP “A” ZERO Offset Zero Control for PREAMP “A” PREAMP “B”...

  • Page 30: Cooling

    FIGURE 2-5. A-C INPUT SOURCE VOLTAGE SELECTION COOLING The power transistors and rectifiers in the ATE power supplies are maintained within their oper- ating temperature range by means of special heat sink assemblies, cooled by internal fans. SIDE AND REAR PANEL OPENINGS AND THE TOP OF THE CASE MUST BE KEPT CLEAR FROM OBSTRUCTIONS TO INSURE PROPER AIR CIRCULATION.

  • Page 31: Preliminary Operational Check

    PRELIMINARY OPERATIONAL CHECK A simple operational check after unpacking and before equipment installation is advisable to ascertain whether the power supply has suffered damage resulting from shipping. Refer to Figures 2-1 and 2-2 for location of operating controls and terminations. Tables 2-1 and 2-2 explain the functions of operating controls/indicators and terminations respectively.

  • Page 32: Grounding

    2.6.1 GROUNDING 2.6.1.1 A-C (SAFETY) GROUND The power supply is equipped with a 3-wire safety line cord and polarized plug. The third (green) wire in the line cord is connected to the chassis and the case of the unit. If a 2-terminal receptacle in combination with an adapter is used, it is imperative that the chassis of the power supply be returned to a-c ground with a separate lead.

  • Page 33: Lag Network Adjustment

    tain excessive capacitance (limit: 1,000pF). Also, with the output and main feedback capacitors removed, there will be an increase in output noise, mainly high frequency noise and pickup, so that external shielding of programming leads and good grounding practices assume added importance in the Fast Mode of operation.

  • Page 35: Section 3 - Operation

    WARNING KEEP INSTRUMENT GROUNDED WHILE IT IS CONNECTED TO THE A-C POWER SOURCE. Kepco power supplies with a flexible a-c power cord are equipped with a 3-prong safety plug, which must be connected to a grounded a-c power outlet. 3.1.2...

  • Page 36: Power Supply/Load Interface

    however, equally valid for either output side grounded. Care should be taken in measuring the ripple and noise at the power supply output or at the load, Measuring devices which are a-c line operated often introduce ripple and noise into the circuit. In the case where the load must be kept completely off ground (d-c isolated) or it must be oper- ated above ground potential, grounding can be accomplished by means of a suitable capacitor connected from either side of the power supply output to the signal ground.

  • Page 37: Remote Sensing Wire Selection

    FIGURE 3-1. TYPICAL OUTPUT IMPEDANCE VS. FREQUENCY PLOT FOR STABILIZED D-C SOURCES NOTE: Load connections for applications requiring solely stabilized output current are not as critical as those requiring stabilized output voltage: a. D-C wire drops do not influence the current stabilizing action, but must be sub- tracted from the available compliance voltage.

  • Page 38: Load Connection

    3.2.1 GENERAL Kepco has provided a group of terminals on the rear programming connector and on the barrier strip (TB201) at the rear of the power supply, which permit maximum flexibility in power sup- ply/load interface techniques. Although all applications tend to exhibit their own problems, the basic interconnections described may be used as a general guide in the interconnection between power supply and load.

  • Page 39: Load Connection, Method I (Local Error Sensing)

    3.2.2 LOAD CONNECTION, METHOD I (LOCAL ERROR SENSING) (SEE FIGURE 3-3.) The most basic power supply interconnection, to primarily resistive, relatively constant loads, located close to the power supply, or for loads requiring stabilized current exclusively, consists of a 2-wire connection from the rear output terminals. Load wire is selected as described previ- ously (refer to PAR.

  • Page 40: Load Connection, Method Ii (Remote Error Sensing)

    3.2.3 LOAD CONNECTION, METHOD II (REMOTE ERROR SENSING) To avoid excessive output effects at remote loads, error sensing must be used. A twisted pair of wires from the sensing terminals directly to the load will compensate for load wire voltage drops up to 0.5 volt per wire, 0.25 volt per wire for 6V models (refer to Figure 3-4).
  • Page 41 Grounding a single point in the output circuit is of great importance. It is hoped that the proceeding paragraphs will be of some assistance in most cases. For help in special applications or difficult problems, consult directly with Kepco's Applica- tion Engineering Department.

  • Page 42: Voltage Mode Operation (Front Panel Control)

    TABLE 3-1. BLEEDER RESISTOR VALUES ATE 3/4 Rack A1R11 (R int) ATE Full Rack A1R11 (R int) Model Typical Values Model Typical Values ATE 6-50DM 510 ATE 6-100DM 25 ATE 15-25DM 1k ATE 15-50DM 200 ATE 25-20DM 2.7k ATE 25-40DM 500...

  • Page 43: Overvoltage Crowbar Setup And Check

    2. Set A-C POWER switch/circuit breaker to ON. Observe the front panel AMPS meter and adjust CURRENT control to the desired value. The CURRENT MODE indicator should go on to indicate that the power supply is truly in the current mode of operation. Set A-C POWER switch/circuit breaker to OFF 3.

  • Page 44: Introduction To Remote Control Of Ate Output

    INTRODUCTION TO REMOTE CONTROL OF ATE OUTPUT For local (front panel) control the VOLTAGE control channel, the CURRENT control channel and the Overvoltage Protector of the ATE are locally adjusted by means of their respective front panel controls, with the jumper connections on the rear programming connector as shown on Figure 3-32.

  • Page 45: Output Voltage Control With An External 0-10 Volt D-C Control Signal

    ATE output voltage by means of a Kepco Digital Programmer. The IEEE 488 bus compatible Kepco SN 488 system, for example, responds to digital input data and can be addressed either by a computer, or manually. The output signal of the SN 488 is a voltage from either zero to 10 Volts or zero to 1 Volt and constitutes the input program for the ATE.

  • Page 46: Voltage Control With A Two-Terminal Resistance

    CALIBRATION NOTE: Refer to Figure 2-4 for location of all internal controls. 4. Check the Precision Voltmeter (M1) for zero reading and correct, if necessary. with the ATE ZERO control. 5. Set the SN 488 input for the ATE to 10 Volts. Observe M1 and calibrate the ATE output volt- age to the exact maximum rated output voltage by means of the SN 488 calibration control.

  • Page 47: Using Preamp "A" And Internal Reference Source

    FIGURE 3-7. TWO-TERMINAL RESISTANCE PROGRAMMING (VOLTAGE CHANNEL), 3.7.2.1 USING PREAMP “A” AND INTERNAL REFERENCE SOURCE If, for example, I is selected to be 1 mA (with 0.1 to 1 mA the recommended range), a 0 to 10k Ohm rheostat. decade or other variable resistance will produce the required 0-10 Volt control potential and thereby control the ATE output voltage from zero to its maximum rated value.
  • Page 48 NOTE: Remote sensing shown. For local sensing leave the links between TB201 terminals 2 (-) S and 3 (-) M and between terminals 5 (+) M and 6 (+) S in place. Disconnect remote sensing wires from TB201 terminals 2 (-) S and 6 (+) S to the load. FIGURE 3-8.

  • Page 49: Voltage Control With A High Impedance Control Source

    3.7.3 VOLTAGE CONTROL WITH A HIGH IMPEDANCE CONTROL SOURCE External control sources which cannot supply at least 100A of control current can be best accommodated by using one of the preamplifiers in the non-inverting configuration. The control source is connected to the ATE as shown in Figure 3-9. FIGURE 3-9.
  • Page 50 NOTE: Remote sensing shown. For local sensing leave the links between TB201 terminals 2 (-) S and 3 (-) M and between terminals 5 (+) M and 6 (+) S in place. Disconnect remote sensing wires from TB201 terminals 2 (-) S and 6 (+) S to the load. FIGURE 3-10.

  • Page 51: Current Control Channel Programming

    An interesting example of the direct drive method is the control of the ATE output current by means of a Kepco SN 488 Digital Programmer. The SN 488 responds to digital input signals, is IEEE 488 bus compatible and can be addressed either by a computer or manually by means of...

  • Page 52: Current Control With A Two-Terminal Resistance

    a keyboard. The attenuated output signal of the SN 488 is a voltage from zero to 1 Volt and con- stitutes the input program for the ATE current channel. Since the SN 488 has two independent outputs (A and B) and only one is needed for current control, the other output may be used to control the ATE output voltage (See par.
  • Page 53 = Internal Reference Voltage 6.2V = Ext. Feedback Resistor (Current Control) Since the ratio E may be expressed as a control current (E ), Eq. 1 can be simplified to read: (Preamplifier) = I (Eq.2) FIGURE 3-12. TWO-TERMINAL RESISTANCE PROGRAMMING (CURRENT CHANNEL), USING PREAMP “A”...
  • Page 54 3. -Vary the EXT. CURRENT CONTROL from zero Ohms to its maximum resistance. The ATE output current, as read on M1, should vary from approximately zero Volts to its rated maxi- mum value. Return the EXT. CURRENT CONTROL to its zero Ohm position FIGURE 3-13.

  • Page 55: Overvoltage Protector Programming

    The ATE crowbar level can be remotely controlled by an external 0 to 10 volt, 1 mA d-c control source. One example of such a control source is the Kepco SN 488 Digital Programmer, which responds to digital input signals and can be controlled by computer or manually. The output of the SN 488 is from zero to 10 Volts or 0 to 1 Volt per channel and serves as the input to the ATE overvoltage protector.

  • Page 56: Automatic (Tracking) Control Of Crowbar Level

    NOTE: Remote sensing shown. For local sensing leave the links between TB201 terminals 2 (-) S and 3 (-) M and between terminals 5 (+) M and 6 (+) S in place. Disconnect remote sensing wires from TB201 terminals 2 (-) S and 6 (+) S to the load. FIGURE 3-14.

  • Page 57: Procedure (Ate Set To Fast Mode)

    erratic triggering occur in actual operation, set front panel CROWBAR LEVEL SET control slightly clockwise. This increases the threshold voltage; i.e., the difference voltage between the crowbar level and the operating voltage. NOTE: Remote sensing shown. For local sensing leave the links between TB201 terminals 2 (-) S and 3 (-) M and between terminals 5 (+) M and 6 (+) S in place.

  • Page 58: Programming Output Voltage And Current Simultaneously Using External Remote Control Voltages

    0 to 10 Volts at 1 mA for the Voltage Channel and 0 to 1 Volt for the Current Channel. An ideal programming source is the Kepco SN 488 Digital Programming System, which provides two independent control volt- ages of the correct magnitude per programming card.

  • Page 59: Procedure, Programming Output Voltage And Current Simultaneously

    NOTE: Remote sensing shown. For local sensing leave the links between TB201 terminals 2 (-) S and 3 (-) M and between terminals 5 (+) M and 6 (+) S in place. Disconnect remote sensing wires from TB201 terminals 2 (-) S and 6 (+) S to the load. FIGURE 3-16.

  • Page 60: Calibration, Voltage Control Channel

    3.10.2 CALIBRATION, VOLTAGE CONTROL CHANNEL NOTE: Refer to Figure 2-4 for location of all internal controls. 1. Open S1. Set VOLTAGE CONTROL SIGNAL to zero. Check the Precision Voltmeter (M1) for zero reading and correct, if necessary, with the power supply E ZERO control.
  • Page 61 like, Since the (open loop) gain of this third control channel is very high, only minute feedback signals in combination with an appropriate external control are required. The design of the required external circuitry is shown by the following example: A target object requires constant illumination, supplied by a lamp, which is connected at the power supply out- put.

  • Page 62: Multiple Power Supply And Systems Operation

    selected to produce the control signal, similar to the example described in a previous application (See PAR. 3.8.2). FIGURE 3-18. CONNECTIONS FOR ILLUMINATION CONTROL, USING EXTERNAL. CURRENT COMPARISON AMPLIFIER PROCEDURE 1. Connect the external components to the ATE power supply as shown in Figure 3-18. 2.

  • Page 63: Series Connection Of Ate Power Supplies

    3.12.1 SERIES CONNECTION OF ATE POWER SUPPLIES Kepco ATE power supplies may be connected in series for increased voltage output. Series connection of two ATE units is described here, but several units, up to an output voltage total of 500 volts may be interconnected. Two basic methods of series connection are commonly used: Automatic and Master/Slave configurations.

  • Page 64: Automatic Series Connection

    3. Use error sensing, as shown in Figure 3·20). to compensate for load wire drops. NOTE: Sensing leads are not required if the application calls for current mode operation exclusively, 4. The load wires should be as short as practicable. Select the load wires as heavy as possible and twist the load wire pair tightly, Approximately equal lengths of load wire between each pair of supplies is recommended.
  • Page 65 NOTE: Remote sensing shown. For local sensing leave the links between TB201 terminals 2 (-) S and 3 (-) M and between terminals 5 (+) M and 6 (+) S in place. Disconnect remote sensing wires from TB201 terminals 2 (-) S and 6 (+) S to the load. FIGURE 3-20.

  • Page 66: Master/Slave Series Operation

    3.12.1.2 MASTER/SLAVE SERIES OPERATION. In this mode of operation the total output voltage of all supplies in the series connection is con- trolled from a common Master supply. while the voltage output of the Slave supplies follow the output voltage of the Master. As seen in Figure 3·21) in each Slave supply.
  • Page 67 NOTES: 1. Remote sensing shown. For local sensing leave the links between TB201 terminals 2 (-) S and 3 (-) M and between terminals 5 (+) M and 6 (+) S in place. Disconnect remote sensing wires from TB201 termi- nals 2 (-) S and 6 (+) S to the load.

  • Page 68: 3.12.1.2.1 Master/Slave Series Operation With Ate 6V Power Supplies

    PROCEDURE 1. Set A-C POWER switch/circuit breaker to OFF at each individual ATE power supply to be connected in series, then connect each ATE to the a-c power line. Adjust the front panel CURRENT control on each ATE completely counterclockwise. Connect a short-circuit con- sisting of a short wire length across the output terminals of each ATE supply.

  • Page 69: Parallel Connection Of Ate Power Supplies

    FIGURE 3-23. DEVELOPING THE DRIVE FOR MASTER/SLAVE SERIES-CONNECTED 6V ATE SUPPLIES. 3.12.2 PARALLEL CONNECTION OF ATE POWER SUPPLIES Normally, crowbar equipped power supplies can not be connected in parallel, since a triggered crowbar in one supply working in a parallel configuration, would present a short circuit to all other supplies and would have to absorb the total output current.

  • Page 70: Automatic Parallel Connection

    FIGURE 3-24. AUTOMATIC PARALLEL OPERATION (TWO SUPPLIES) 3.12.2.1 AUTOMATIC PARALLEL CONNECTION Figure 3-24 shows how the two power supplies operate in the automatic parallel mode (connec- tions shown in Figure 3-25). Load variations should be confined to the stabilization region of Supply #2 since there is an initial adjustment error (E ) between the two supplies.
  • Page 71 NOTE: Remote sensing shown. For local sensing leave the links between TB201 terminals 2 (-) S and 3 (-) M and between terminals 5 (+) M and 6 (+) S in place. Disconnect remote sensing wires from TB201 terminals 2 (-) S and 6 (+) S to the load. FIGURE 3-25.

  • Page 72: Master/Slave Parallel Connection

    3.12.2.2 MASTER/SLAVE PARALLEL CONNECTION This method is especially convenient with ATE power supplies, since no external current sens- ing resistors are required and all control connections can be made via the ATE rear program- ming connectors. In Master/Slave parallel mode, the EXT. CURRENT COMPARISON amplifier on each Slave unit is disconnected from its 15V bias and is driven instead from the common Master CURRENT SENSING amplifier As the Master supply delivers load current from zero to its rated maximum value, the signal from its CURRENT SENSING amplifier changes from zero...
  • Page 73 NOTE: Remote sensing shown. For local sensing leave the links between TB201 terminals 2 (-) S and 3 (-) M and between terminals 5 (+) M and 6 (+) S in place. Disconnect remote sensing wires from TB201 terminals 2 (-) S and 6 (+) S to the load. FIGURE 3-26.

  • Page 74: Redundant Parallel Operation

    3.12.2.3 REDUNDANT PARALLEL OPERATION Two ATE Power Supplies can be connected in parallel to a load in such a way that if one of the power supplies fails or is interrupted in any other manner, the other will continue to supply unin- terrupted load current.
  • Page 75 NOTES: Remote sensing shown. For local sensing leave the links between TB201 terminals 2 (-) S and 3 (-) M and between terminals 5 (+) M and 6 (+) S in place. Disconnect remote sensing wires from TB201 terminals 2 (-) S and 6 (+) S to the load. External diodes D1 and D2 isolate the two power supplies from each other, and must be rated for the max- imum load voltage and current of the ATE units used.

  • Page 76: Programming With Reference To The Negative Power Supply Output

    3.13 PROGRAMMING WITH REFERENCE TO THE NEGATIVE POWER SUPPLY OUTPUT ATE power supplies may be used in many unique applications. The two uncommitted ATE pre- amplifiers make it possible to solve application problems which would require special circuitry or additional equipment with standard power supplies. One example of such an application prob- lem is the case where the programming common must be the negative output side of the power supply, rather than the positive side.
  • Page 77 age divider (R ', R '), such that the common mode voltage, E ' < 10V, we let R ' = 1 megohm, R ' 100kOhms (except R ' = 49.9kOhms for 150V models and R 24.9kOhms for 325V model). In this case the output voltage for PREAMP “A” can be expressed ...

  • Page 78: Using Fast Mode When Programming With Reference To Negative Output

    NOTE: Remote sensing shown. For local sensing leave the links between TB201 terminals 2 (-) S and 3 (-) M and between terminals 5 (+) M and 6 (+) S in place. Disconnect remote sensing wires from TB201 terminals 2 (-) S and 6 (+) S to the load. FIGURE 3-30.

  • Page 79: Application Of The Isolated Flag Signals

    5. To reduce a-c line-related noise at the output, connect one of the following to the ATE chas- sis GND terminal: • the return of the programming source, • the corresponding output terminal of the ATE, • the corresponding Load terminal. 6.
  • Page 81 FIGURE 3-32. SIMPLIFIED SCHEMATIC DIAGRAM, ATE 1/2, 3/4 AND FULL RACK -46/(-47 022324 3-47/(3-48 Blank)
  • Page 83 FIGURE 3-33. SIMPLIFIED SCHEMATIC DIAGRAM, PROGRAMMABLE OVERVOLTAGE DETECTOR AND CROWBAR CIRCUIT -48/(-49 022324 3-49/(3-50 Blank)

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