LH Series 5 kW Regulated High Voltage DC Power Supplies	PDF Print Version HTML Print Version
Models from 0 to 1 kV through 0 to 100 kV, 10.50” H x 19” W x 24.0” D, 60 lbs.
The LH Series are fully compliant with the European Harmonized EMI Directive EN50082-2 and with the European Low Voltage (Safety) Directive, 73/23/EEC.			1 kV to 100kV Rack Mount CE Compliant Semi S2-93 Compliant

Glassman’s Arc management circuitry will quickly suppress arcing conditions that can occur regularly in high voltage applications limiting the amount of energy that is being fed to the source as well as providing maximum safety and protection for both the power supply and customer load. This feature makes the LH ideal for use in a host of Vacuum processing related applications, including Magnetron sputtering, Electron-beam coating, and Ion sources to name a few. The LH can also be used as a reliable, general laboratory high voltage power supply.

The LH series is CE Mark certified and can be utilized with the RS-232 digital interface option, which is now available for most of Glassman’s standard models. Glassman also offers a comprehensive three-year warranty.

The LH is available in Master/Slave configurations up to 25kW (1 Master/4 Slave units). Please consult factory for additional details.

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 cur-rent 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 better than 0.1% 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 available.

(Specifications apply from 5% to 100% rated voltage. Operation is guaranteed down to zero voltage with a slight degradation of performance.)

Input: 187 - 242 VAC, 3Ø , 48-63 Hz, 6500 VA maximum at full load. Less than 20 A/Ø at 208 VAC. A five position rear terminal block with protective cover is provided.

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.

Ripple: Better than 0.05% RMS of rated voltage at full load.

Current Regulation: When in current regulation mode, 8-100 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% reading + 0.2% 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 setting plus 0.5% of rated output. 8 kV to 100 kV: 1% of setting plus 0.2% of rated output.

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

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 TBD% min. load.
8-20 kV: t = 50 ms with 9% min. load.
25-100 kV: t = 200 ms with 7% min load.

Temperature Coefficient: 0.01%/ºC.

Ambient Temperature: -20 to +40ºC, operating; -40 to +85ºC, 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 ultimate protection.

Arc Quench: Optional on models 1 kV through 6 kV; standard on models 8 kV through 100 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 100 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 volt-age 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.

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