LH Open Stack Series 4 kW Regulated High Voltage DC PowerSupplies

200 kV to 500 kVCE Compliant

Parallelable upto 20 kW

The LH open stack family are sophisti-cated 4 kW power supplies withextremely low ripple and noise. Theyare air insulated fast response unitswith tight regulation.

The LH Series are fully compliant withthe following European Directives:

• EN61010/ IEC1010, Safety

• EN61000-6-4, Conducted andRadiated Emissions

• EN61000-6-2:2005, Conducted andRadiated Immunity

Features:Arc Quench. The HV output is inhibit-ed for a short period after each load arcto help extinguish the arc.

Arc Sensing. Internal circuitry con-stantly senses and integrates arcs thatoccur over a given time. In the eventthat a load arcing problem develops,the power supply will cycle off, thenautomatically restart.

Embedded Microcontroller Control.Integral RS-232, USB and optionalEthernet communications provideremote control program and monitor.

Air Insulated. The LH Series features“air” as the primary dielectric medium.No oil or encapsulation is used toimpede serviceability, or increaseweight.

Low Ripple. Typically, ripple is lessthan 0.1% peak to peak of rated voltageat full load.

Parallelable. One master supply andup to 4 slave supplies provide a maxi-mum of 12 - 20 kW depending on kV.

Pulse-Width Modulation. Off-the-linepulse-width modulation provides highefficiency and a reduced parts count forimproved reliability.

Constant Voltage/Constant CurrentOperation. Automatic crossover fromconstant-voltage to constant-currentregulation provides protection againstoverloads, arcs, and short circuits.

Constant Current/Current Trip. A rearpanel selector switch on the remotechassis allows selection of either cur-rent mode.

Tight Regulation. Voltage regulation isbetter than 0.005% for allowable lineand load variations. Current regulationis better than 0.1% from short circuit torated voltage.

Warranty. Standard power supplies arewarranted for three years; OEM andmodified power supplies are warrantedfor one year. A formal warranty state-ment is available..

Models from 0 to 200 kV through 0 to 500 kV. 4 kW system shown above (and bottom left).

LH open stack series models consist of a rack style driver chassis, a high voltagestack assembly, and a remote control unit. The driver chassis is provided in a cabi-net which is 9.10” H X 25.06” D, The remote control unit is 5.218” H X 19.00” W X6.625” D.

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Designing Solutions for High Voltage Power Supply Applications

related component is determined bythe amount of power delivered to theload. The maximum values for bothcomponents are specified in themodels chart.

Stability: 0.01% per hour after 1/2hour warm-up, 0.05% per 8 hours.

Voltage Rise/Decay Time Constant:400 ms typical using either the HVON switch or remote programmingwith a minimum 2.7 mA resistiveload.

Temperature Coefficient: 0.01%/°C.

Ambient Temperature: -20 to +40° C,operating, -40 to +85° C storage.

Protection: Automatic current regu-lation protects against all overloads,including arcs and short circuits.Thermal switches and RPM sensingfans protect against thermal over-load. Fuses, surge-limiting resistorsand low energy components provideultimate protection.

Arc Quench: An arc quench featureprovides sensing of each load arcand quickly inhibits the HV outputfor approximately 0.25 seconds aftereach arc.

Arc Sensing: Internal circuitry sensesthe number of arcs caused by exter-nal load discharges. If the rate ofconsecutive arcs exceeds approxi-mately one arc per second for 5 arcs,the supply will turn off for approxi-mately 5 seconds to allow clearanceof the fault. After this period thesupply will automatically return tothe programmed kV value with therise time constant indicated. If theload fault still exists the above cyclewill repeat.

RS232/USB/Ethernet Programming andMonitor Accuracy:

Resolution: 0.025% of full scalefor both the voltage and the cur-rent programs. 0.1% of full scalefor both the voltage and the cur-rent monitors.

Remote setting accuracy: Voltagesetting accuracy is better than0.5% of setting + 0.2% of rated.

Remote reading accuracy: Voltagereading accuracy is 0.5% of read-ing + 0.2% of rated. Currentreading accuracy is 1% of reading+ 0.1% of rated.

SpecificationsSpecifications apply from 5% to 100%rated voltage. (Operation is guaran-teed down to zero voltage with aslight degradation of performance.)

Input: 187-264 V RMS, 3Ø, 48-63 Hz,5500 VA maximum at full load. Lessthan 16A/Ø at 208 VAC. A five posi-tion terminal block with protectivecover is provided on the rear panel ofthe driver chassis.

Efficiency: Typically 80% at full load.

Output: Continuous stable adjust-ment from 0 to rated voltage or cur-rent by panel mounted 10-turnpotentiometers with 0.05% resolu-tion, or by external 0 to 10 V signalsis provided. Repeatability betterthan 0.1% of setting. Voltage accura-cy is 0.5% of setting + 0.2% of rated.

Static Voltage Regulation: Better than+/- 0.005% for specified line varia-tions and 0.005% for no load to fullload variations.

Current Regulation: Better than 0.1%from short circuit to rated voltage atany load condition, when in currentregulation mode.

When in current trip mode the HVoutput will disable and latch offwhen the load current reaches theprogrammed current level. Reset isaccomplished by either cycling theAC power or HV ON/OFF buttons orby toggling the HV enable signal. Aswitch located on the rear panel ofthe remote control chassis allowsthe selection of current limit or cur-rent trip operation.

Voltage monitor: 0 to 10 V equivalentto 0 to rated voltage. Accuracy, 0.5%of reading + 0.2% of rated.Impedance is 10 KΩ.

Current monitor: 0 to 10 V equivalentto 0 to rated current. Accuracy, 1% ofreading + 0.05% of rated. Reversepolarity models: 1% of reading +0.1% of rated. Impedance is 10 KΩ.

Stored Energy: Stored energy varieswith output voltage and is tabulatedin the models chart.

Ripple: Ripple consists of two majorcomponents, inverter switching fre-quency components and line fre-quency related components. Theinverter frequency component isdependent on the amount of loadcurrent drawn. The line frequency

Remote Control Unit: A separatecontrol panel chassis is providedwhich contains all the control func-tions.

The front panel of this assembly con-tains: separate 10-turn controls withlocking vernier dials used to set thevoltage and current levels, HighVoltage ON switch, High voltageOFF/Reset switch and an AC poweron/off switch and indicator. LED‘sindicate when the high voltage is on,output polarity, interlock status, faultstatus, and whether the supply isoperating in a voltage or current reg-ulating mode. Output levels areindicated by voltage and current dig-ital meters.

The rear panel of this assembly con-tains: AC Power On indicator,ground stud, driver/control chassisinterface connectors, currentlimit/current trip selector switch,remote user interface connector andRS232/USB connectors.

The signals provided on the remoteuser interface connector are as fol-lows:

Inputs: Output voltage and currentprogram signals, and high voltageenable.

Outputs: Output voltage and currentmonitor signals, a +10 V referencesource, a high voltage status signal,fault status, and V/I mode status.

Signal common and ground refer-ence terminals are also provided.

Remote HV Enable: 0 - 1.5 V = OFF,2.5 - 15 V = ON.

External Interlock: Open = off, closed= on. Latching with reset via the HVON switch. The front panel indicatoris illuminated when the interlock isopen. Interlock connections are pro-vided on a terminal strip on the rearpanel of the driver chassis.

Accessories: 25 feet of detachableinterconnection cables, a 10 foot nullmodem cable, and a 10 foot USBcable are provided.

OptionsSymbol Description

ZR Zero start Interlock. Voltage control, local or remote, must be zero before HV will enable.

SS Slow start ramp. Specify standard times of 5, 10, 15, 20, or 30 seconds + 20%.

5VC 0-5 V voltage and current program/monitor.

200 180-220 VRMS, 3Ø input, 48-63 Hz.

400 340-460 VRMS, 3Ø input, 48-63 Hz.

ETH Virtual RS-232 COM port over Ethernet network. (Requires compatible OS (eg Windows) for COM drivers)

Please consult factory for special requirements.

Positive

Polarity

Negative

Polarity

Reversible

Polarity

Output

Voltage

Output

Current

Max Stored

Energy (J)

High Freq.

Ripple (P-P)

Line Freq.

Ripple (P-P)

LH200P20 LH200N20 LH200R20 0-200 kV 0-20 mA 109 180 20

LH250P16 LH250N16 LH250R16 0-250 kV 0-16 mA 129 225 25

LH300P12.5 LH300N12.5 LH300R12.5 0-300 kV 0-12.5 mA 159 270 30

LH350P9 LH350N9 LH350R9 0-350 kV 0-9 mA 180 315 35

LH400P7 LH400N7 LH400R7 0-400 kV 0-7 mA 211 360 40

LH450P6 LH450N6 LH450R6 0-450 kV 0-6 mA 243 405 45

LH500P5 LH500N5 LH500R5 0-500 kV 0-5 mA 264 450 50

Positive

Polarity

Negative

Polarity

Reversible

Polarity

Output

Voltage

Output

Current

Max Stored

Energy (J)

High Freq.

Ripple (P-P)

Line Freq.

Ripple (P-P)

LH200P40 LH200N40 LH200R40 0-200 kV 0-40 mA 218 180 20

LH250P32 LH250N32 LH250R32 0-250 kV 0-32 mA 258 225 25

LH300P25 LH300N25 LH300R25 0-300 kV 0-25 mA 318 270 30

LH350P18 LH350N18 LH350R18 0-350 kV 0-18 mA 360 315 35

LH400P14 LH400N14 LH400R14 0-400 kV 0-14 mA 422 360 40

LH450P12 LH450N12 LH450R12 0-450 kV 0-12 mA 486 405 45

LH500P10 LH500N10 LH500R10 0-500 kV 0-10 mA 528 450 50

4 kW Models, Open Stack

8 kW Models, Open Stack

For Models Greater Than 8 kW, Please Consult Factory.

High Voltage Stack Assembly

Driver Assembly

Driver Assembly - Slave

Remote Control Assembly

8 kW System

Designing Solutions for High Voltage Power Supply Applications