spellman MCP Series High Voltage DC Converter Power Supply Module User Guide

Spellman MCP Series High Voltage DC Converter Power Supply Module

SAFETY

DANGER HIGH VOLTAGE RISK OF ELECTROCUTION

Observe extreme caution when working with this equipment

• High voltage power supplies must always be connected to protective earth
• Do not touch connections unless equipment is turned off and the capacitance of both the load and power supply are grounded
• Allow adequate time for discharge of internal capacitance of the power supply
• Do not ground yourself or work under wet or damp conditions

Servicing Safety

• Maintenance may require removing the Instrument cover with the power on
• Servicing should only be done by qualified personnel aware of the hazards
• Return to supplier for servicing

Unit Description

The MCP3P1/I15 HV unit is a 3kV, 330uA, DC to DC converter, it is packaged in a shielded metal enclosure. The output is isolated from ground to 15kV, such that it can be floated upon the HV output of an accelerator voltage or other high voltage source, as shown in the diagram below. The unit has remote voltage programming and a voltage monitor, it features low injected ripple when used with biasing supplies. Typical applications for the unit are:

• Mass Spectrometry Detectors
•  Microchannel Plates
•  Electron Multipliers
•  Channel Electron Multipliers

Unit Ratings

1. Power Input
2. 24Vdc ± 10%, 600mA (max)
3. HV Output
4. 100Vdc to 3kVdc. 330μA (max)
5.  Protection
6. The isolation provided for 15kV (to float on an external supply)

Environmental conditions

• Temperature Range:
• Operating: 0°C to +40°C
• Storage: -35°C to +85°C

Safety

The conditions of this manual must be complied with to maintain safety; operating the unit in a manner not defined in this manual may compromise the protection from electric shock.

Meaning of Symbols

Refer to manual before operating

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Caution, possibility of electric shock

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Protective conductor terminal (PE)

Unit Grounding

The unit is contained in an earthed case. The case of the unit shall be properly bonded, via the unit chassis, to the main protective earth termination in the end product

Installing the Unit

The unit is designed for indoor use and is to be supplied from a double insulated, UL recognized, 24V dc supply.

1.  The unit shall be properly bonded to the main protective earthing termination in the end product.
2.  The unit should only be used in a Pollution Degree 2 Installation Category II environment.
3. Consideration should be given to conducting the following tests with the power supply installed in the end product:
4. Dielectric withstand test, between live parts of the power supply and the end product chassis. Permissible Limits Test with the power supply installed in the end product.
5. The input and output connectors are not intended for field connections and should only be connected to internal wiring in the end-use equipment.
6. The unit is intended for use as a component and no surface of the unit should be accessible in the end product.
7.  The unit is contained in an enclosed case and can be mounted in any orientation. Cooling airflow is recommended

Connections

Power input and signal connection Signal I/O is provided through a standard 9 way ‘D’ type male connector mounted in the end of the unit (see mechanical outline). The pin connections used are shown in the table below.

Ground return for DC in. For best performance it is recommended to connect all pins.

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7| +24VDC Return| I|
8| +24VDC Return| I|
9| +24VDC Return| I|

HV Outputs

• The standard HV output leads are as follows.
• HV positive: 1000mm flying lead un-terminated URM76
• HV negative: 1000mm flying lead un-terminated URM76

Mechanical Installation
The unit shall be fixed in place in the end-user system using screws on the hold-down points provided. Unit weight: 1kg Mechanical Dimensions – see drawing in Appendix A

Operating the Unit

Voltage Programming
The output voltage of the module is controlled by a 0 to +10Vdc input corresponding to 0 to 3kV on the HV O/P POS with respect to the HV O/P NEG. At control voltages above 1v the output will reflect the control voltage to an accuracy of ±1%. At control voltages of less than 1v the output voltage will be proportional to the control voltage.

Voltage Monitor
The voltage monitor output signal is 0 to +5Vdc, which represents 0 to 3kV ±10%

Appendix A – Mechanical layout

References

• 📧hvsales@spellmanhv.co.ukB

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