LH OpenStack Series
4 kW RegulatedHigh Voltage
DC PowerSupplies
200 kV to 500kV
CE Compliant
Parallelable up
to 20 kW
Fully RoHSCompliant
The LH open stack family are sophisticated 4kW power supplies with extremely low ripple
and noise. They are air insulated fast responseunits with tight regulation
Please refer to Technology > Applications pageon our web site for typicalapplications.
The LH Series, when configured with the400 VAC input option, are fully compliant withthe following European Directives:• EN61010/ IEC61010, Safety• EN61000-6-4, Conducted and RadiatedEmissions• EN61000-6-2:2005, Conducted andRadiated Immunity• 2011/65/EU, Restriction of the use ofHazardous Substances (RoHS)

Models from 0 to 200 kV through 0 to 500 kV. 4 kW system shown above (and bottomleft).
LH open stack series models consist of a rack style driver chassis, a high voltage stackassembly, and a remote control unit. The driver chassis is provided in acabinet which is 9.10” H X 25.06” D. The remote control unit is 5.218” H X 19.00” W
X 6.625” D.

Features:
Arc Quench. The HV output is inhibited
for a short period after each load arc to
help extinguish the arc.
Arc Sensing. Internal circuitry constantly senses and integrates arcs that occur
over a given time. In the event that aload arcing problem develops, the power
supply will cycle off, then automaticallyrestart.

Constant Voltage/Constant Current
Operation. Automatic crossover fromconstant-voltage to constant-current regulation provides protection against overloads, arcs, and short circuits.

Embedded Microcontroller Control.
Integral RS-232, USB and optional
Ethernet communications provide
remote control program and monitor.

Constant Current/Current Trip. A rear
panel selector switch on the remotechassis allows selection of either currentmode.

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

Tight Regulation. Voltage regulation isbetter than 0.005% for allowable line andload variations. Current regulation isbetter than 0.1% from short circuit torated voltage.

Low Ripple. Typically, ripple is less than0.1% peak to peak of rated voltage at fullload.
Parallelable. One master supply and up
to 4 slave supplies provide a maximum of
12 - 20 kW depending on kV.

www.xppower.com
CE (Meets all applicable directives), UKCA

Pulse-Width Modulation. Off-the-line
pulse-width modulation provides highefficiency and a reduced parts count for
improved reliability.

Warranty. All power supplies are
warranted for three years. A formal warranty statement is available.

102002-146LHA H

24-Sept-2020

Specifications
Specifications apply from 5% to 100%
rated voltage. (Operation is guaranteed down to zero voltage with a slightdegradation of performance.)
Input: 187-228 V RMS, 3Ø, 48-63 Hz,5500 VA maximum at full load. Less
than 16A/Ø at 208 VAC. A five position terminal block with protective
cover is provided on the rear panel ofthe driver chassis. Mains service
must be protected with fuses
or circuit breakers with a maximum rating of 100 A for
200/208 VAC models & 60 A
for 400 VAC models.
Efficiency: Typically 80% at full load.
Output: Continuous stable adjustment
from 0 to rated voltage orcurrent by panel mounted 10-turnpotentiometers with 0.05% resolution,or by external 0 to 10 V signals is provided. Repeatability better than 0.1%
of setting. Voltage
accuracy is 0.5% of setting + 0.2%
of rated.
Static Voltage Regulation: Better than+/- 0.005% for specified line variations
and 0.005% for no load
to full load variations.
Current Regulation: Better than 0.1%
from short circuit to rated voltage at
any load condition, when in current
regulation mode.
When in current trip mode the HV
output will disable and latch off when
the load current reaches the programmed current level. Reset isaccomplished by either cycling the ACpower or HV ON/OFF buttons or bytoggling the HV enable signal.
A switch located on the rear panel ofthe remote control chassis allows theselection of current limit orcurrent trip operation.
Voltage monitor: 0 to 10 V equivalent
to 0 to rated voltage. Accuracy, 0.5%of reading + 0.2% of rated. Impedanceis 10 KΩ.
Current monitor: 0 to 10 V equivalent
to 0 to rated current. Accuracy, 1% ofreading + 0.05% of rated. Reverse
polarity models: 1% of reading + 0.1%of rated. Impedance is 10 KΩ.
Stored Energy: Stored energy varies
with output voltage and is tabulated in
the models chart.
Ripple: Ripple con-sists of two major components, inverter switching frequency components
and line frequency related components.
The inverter frequency component isdependent on the amount of load current drawn. The line frequency relatedcomponent is determined by theamount of power delivered to theload. The maximum values for bothcomponents are specified in the models chart.
Stability: 0.01% per hour after 1/2
hour warm-up, 0.05% per 8 hours.
Voltage Rise/Decay Time Constant:

400 ms typical using either the HV ONswitch or remote programming with aminimum 2.7 mA resistive load.
Parallel systems require an additional
2.7 mA load per slave.
Temperature Coefficient: 0.01%/°C.
Ambient Temperature: -20 to +40°
C, operating, -40 to +85° C storage.
Protection: Automatic current regulation protects against all overloads,including arcs and short circuits.
Thermal switches and RPM sensing
fans protect against thermal overload.
Fuses, surge-limiting resistors and low
energy components provide ultimateprotection.
Arc Quench: An arc quench featureprovides sensing of each load arc andquickly inhibits the HV output for
approximately 0.25 seconds after eacharc.
Arc Sensing: Internal circuitry senses
the number of arcs caused by externalload discharges. If the rate of consecutive arcs exceeds approximately one
arc per second for 5 arcs, the supply
will turn off for approximately 5 seconds to allow clearance of the fault.
After this period the supply will automatically return to the programmed kV
value with the rise time constant indicated. If the load fault still exists theabove cycle will repeat.
RS232/USB/Ethernet Programmingand Monitor Accuracy:
Resolution: 0.025% of full scale forboth the voltage and the current
programs. 0.1% of full scale forboth the voltage and thecurrent monitors.

Remote setting accuracy: Voltage

setting accuracy is better than
0.5% of setting + 0.2% of rated.

www.xppower.com

Remote reading accuracy:

Voltage reading accuracy is 0.5% ofreading + 0.2% of rated. Current
reading accuracy is 1%of reading + 0.1% of rated.
Remote Control Unit: A separate
control panel chassis is provided whichcontains all the control
functions.
The front panel of this assembly
contains: separate 10-turn controls
with locking vernier dials used to set
the voltage and current levels, HighVoltage ON switch, High voltage
OFF/Reset switch and an AC power
on/off switch and indicator. LED‘s indicate when the high voltage is on, output polarity, interlock status, fault status, and whether the supply is operating in a voltage or current
regulating mode. Output levels areindicated by voltage and current
digital meters.
The rear panel of this assembly
contains: AC Power On indicator,
ground stud, driver/control chassis
interface connectors, current limit/current trip selector switch, remote userinterface connector
and RS232/USB connectors.
The signals provided on the remoteuser interface connector are as
follows:
Inputs: Output voltage and current
program signals, and high voltage
enable.
Outputs: Output voltage and current
monitor signals, a +10 V reference
source, a high voltage status signal, fault
status, and V/I mode status.
Signal common and ground reference
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 HV
ON switch. The front panel indicator
is illuminated when the interlock isopen. Interlock connections areprovided on a terminal strip on therear panel of the driver chassis.
Accessories: 25 feet of detachable
interconnection cables, a 10 foot nullmodem cable, and a 10 foot USB cable
are provided.

Options
Symbol 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. (Required for CE compliance.)
ETH
Virtual RS-232 COM port over Ethernet network. (Requires compatible OS (eg Windows) for COM drivers)
Please consult factory for special requirements.

4 kW Models, Open Stack
Positive
Polarity

Negative
Polarity

Reversible
Polarity

OutputVoltage

OutputCurrent

Max StoredEnergy (J)High Freq.
Ripple (P-P)

Line Freq.
Ripple (P-P)

LH200P20

LH200N20

LH200R200-200 kV

0-20 mA

10915020

LH250P16

LH250N16

LH250R160-250 kV

0-16 mA

129

16020

LH300P12.5

LH300N12.5

LH300R12.50-300 kV

0-12.5 mA

159

15020

LH350P9

LH350N9

LH350R90-350 kV

0-9 mA

180

13020

LH400P7

LH400N7LH400R70-400 kV

0-7 mA

211

11020

LH450P6

LH450N6

LH450R60-450 kV

0-6 mA

243

10520

LH500P5

LH500N5LH500R50-500 kV

0-5 mA

264100

208 kW Models, Open Stack
PositivePolarity

Negative
Polarity

Reversible
Polarity

OutputVoltage

OutputCurrent

Max Stored
Energy (J)High Freq.
Ripple (P-P)

Line Freq.
Ripple (P-P)

LH200P40

LH200N40

LH200R400-200 kV

0-40 mA

218

150

20

LH250P32

LH250N32

LH250R320-250 kV

0-32 mA

258

160

20

LH300P25

LH300N25

LH300R250-300 kV

0-25 mA

318

15020

LH350P18

LH350N18

LH350R180-350 kV

0-18 mA

360

13020

LH400P14

LH400N14

LH400R140-400 kV

0-14 mA

42211020

LH450P12

LH450N12

LH450R120-450 kV

0-12 mA

486

10520LH500P10

LH500N10

LH500R100-500 kV0-10 mA

528

10020For Models Greater Than 8 kW, Please Consult Factory.

www.xppower.com

High Voltage Stack Assembly

www.xppower.com

Driver Assembly

Driver Assembly - Slave

www.xppower.com

Remote Control Assembly

www.xppower.com

8 kW System

www.xppower.com