5 kW Regulated
High Voltage DC
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|Models from 0 to 1 kV through 0 to
150 kV, 10.50” H x 19” W x 24.0” D, 60 lbs.
|The The LH family of power
supplies are sophisticated, 5 kW, high voltage power supplies with low
ripple and noise. They are air insulated, fast response units, with tight
Please refer to
Technology > Applications page on our web site for typical applications
The LH Series, when configured with the 400 VAC Input Option, is fully
compliant with the following European Harmonized EMI Directives:
• EN61010/ IEC61010, Safety
• EN61000-6-4, Conducted and Radiated Emissions
• EN61000-6-2:2005, Conducted and Radiated Immunity.
- 1 kV to 150kV
- Rack Mount
- CE Compliant
- Semi S2-93 Compliant
Arc Quench. The HV output is inhibited for a short period
after each load arc to help extinguish the arc.
Arc Count. Internal circuitry constantly senses and
integrates arcs that occur over a given time. In the event a system or load arcing problem develops
and exceeds factory- set parameters, the power supply will cycle off in an attempt to clear the fault
and then automatically restart after a preset “off dwell time”.
Pulse-Width Modulation. Off-the-line pulse-width modulation
provides high efficiency and a reduced parts count for improved reliability.
Low Ripple. Ripple is less than 0.05% RMS of rated voltage
at full load.
Air Insulated. The LH Series features “air” as the primary
dielectric medium. No oil or encapsulation is used to impede serviceability or increase weight.
Constant Voltage/Constant Current Operation. Automatic
crossover from constant-voltage to constant-current regulation provides protection against overloads,
arcs, and short circuits.
Constant Current/Current Trip. A rear panel switch allows
selection of either current mode.
Redundant Thermal Overload Protection. Thermostats and fan
RPM sensing shut down the power supply due to over temperature or reduced fan speeds.
Tight Regulation. Voltage regulation is
better than 0.005% for allowable line variations and 0.01% for allowable load
variations. Current regulation is typically better than 0.2% from short circuit
to rated voltage.
Differentially Coupled Analog Control Signals. All voltage
and current programming and monitoring signals are coupled to the user interface by true differential
amplifiers. This provides for the ability to return the program and monitor commons to ground or system
common at the source. This arrangement isolates the return wires and eliminates errors due to unwanted
return currents flowing in these connections.
Warranty. Standard power supplies are warranted for three
years; OEM and modified power supplies are warranted for one year. A formal warranty statement is
(Specifications apply from 5% to 100% rated voltage. Operation is
guaranteed down to zero voltage with a slight degradation of performance.)
Input: 187 - 264 V RMS, Three-Phase,
48-63 Hz, 6500 VA maximum at full load. Less than 20 A per phase at 208 VAC. A
five position rear terminal block with protective cover is provided.
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 greater than 85% at full load.
Output: Continuous, stable, adjustment
from 0 to rated voltage or current by panel mounted 10-turn potentiometers with
0.05% resolution, or by external 0 to 10 V signals is provided. Voltage accuracy
is 0.5% of setting + 0.2% of rated.
Static Voltage Regulation: Better than ±0.005% for specified
line variations and 0.01% for no load to full load variations.
Dynamic Voltage Regulation: For load transients from 10% to
99% and 99% to 10%, typical deviation is less than 2% of rated output voltage with recovery to within
1% in 500 µs and recovery to within 0.1% in 1 ms. For 80-100KV models,
V-Load regulation is 0.025%.
Ripple: Better than 0.05% RMS of rated voltage at full load.
Current Regulation: When in current
regulation mode, 8-150 kV, better than 0.2%, 1-6 kV, better than 0.5% from short
circuit to rated voltage at any load condition.
When in current trip mode the HV output will
disable and latch off when the load current reaches the programmed current
level. Reset is accomplished by either cycling the AC power or HV ON/OFF
buttons, or by toggling the HV enable signal. A switch located on the rear panel
allows the selection of current limit modes: constant current, or current trip.
Voltage Monitor: 0 to +10 V equivalent to 0 to rated voltage.
Accuracy, 0.5% of reading + 0.2% of rated. Impedance is 10 KΩ
Current Monitor: 0 to +10 V equivalent
to 0 to rated current. Accuracy: 1 kV to 6 kV: 1.5% of reading plus 0.5% of
rated output. 8 kV to 150 kV: 1% of reading plus 0.2% of rated output. Impedance
is 10 KΩ
Stability: 0.01% per hour after 1/2 hour warm-up, 0.05% per
Voltage Rise/Decay Time Constant: (Typical using either HV
enable or remote programming control and a resistive load.)
1-6 kV: t = 50 ms with 4% min. load.
8-20 kV: t = 50 ms with 9% min. load.
25-100 kV: t = 200 ms with 7% min load.
125-150 kV: t = 400 ms with 8% min load.
Temperature Coefficient: 0.01%/ºC.
Ambient Temperature: -20 to +40ºC, operating; -40 to +85ºC,
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 ultimate protection.
Arc Quench: Optional on models 1 kV through 6 kV; standard on
models 8 kV through 150 kV. An arc quench feature provides sensing of each load arc and quickly inhibits
the HV output for approximately 20 ms after each arc.
Arc Count: Optional on models 1 kV through 6 kV; standard on
models 8 kV through 150 kV. Internal circuitry senses the number of arcs caused by external load
discharges. If the rate of consecutive arcs exceeds approximately one arc per second for five arcs, the
supply will turn off for approximately five seconds to allow clearance of the fault. After this period,
the supply will return automatically to the programmed output voltage value with the voltage rise time
constant indicated. If the load fault still exists, the above cycle will be repeated
External Interlock: Open = off, closed = on. Normally latching
except for blank front panel version where it is non-latching.
Front Panel Elements: The front panel contains all local control
functions. These control functions are: AC power on/off circuit breaker and indicator light, separate
10-turn controls with locking vernier dials used to set voltage and current levels, HIGH VOLTAGE ON
switch, and HIGH VOLTAGE OFF/RESET switch. LED's indicate: when high voltage is on, output polarity,
interlock, fault status, and whether the supply is operating in a voltage or current regulating mode.
Output levels are indicated by voltage and current digital meters.
Rear Panel Elements: AC power entry terminal strip, power on
indicator, ground stud, HV output connector, current limit/current trip switch, remote interface terminal
strip and connector.
The remote interface terminal strip provides connections for the interlock
circuit. In addition, jumpers on the terminal strip select local or remote operation of current program,
voltage program and HV enable. Signal common and ground reference terminals are also provided.
The remote interface connector provides differential voltage and current
program signals, high voltage enable, differential output voltage and current monitor signals, HV enable
status, I/V regulation mode status, fault status, and a +10 V reference source. Signal common and ground
reference terminals are also provided.
Remote HV Enable/Disable:
0 - 1.5 V = OFF,
2.5 - 15 V = ON.
Accessories: Remote interface mating connector and detachable, 8
foot, shielded high voltage coaxial cable provided. See Model Chart for cable type.
Weight: 60 pounds.
||180 to 220 VRMS,
three phase input, 48-63 Hz, derate output current by 10%.
||340 to 460 VRMS,
three phase input, 48-63 Hz. (Required for CE compliance.)
panel, power switch only.
interlock. Voltage control, local or remote, must be at zero before HV
||Slow start ramp.
Specify standard times of 5, 10, 15, 20, or 30 seconds ± 20% .
||0-5 V voltage and
||For 1 to 6 kV
models. Arc quench and arc count are provided as described in
specifications for 8 to 150 kV models.
||RS-232 control and monitor.
||Common to ground
isolation for 1 to 6 kV models. (Standard on 8 to 150 kV models.)
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