VHQ Programmable High Voltage Power Supply

Introduction

The iseg Spezialelektronik GmbH company specialises in the development and production of High Voltage Power Supplies for Industry and Research.
This is based on 20 years of experience in the development and use of technologies of modern High Voltage generation.

These VME hardware modules are VME High Voltage power supplies in 2 slot width. They are available in 1 channel and 2 channel versions in same dimensions. This application supports the 2 channel versions.
It has a LCD display to show the voltage or current.
It supports a variable rate of change of output voltage, and has switchable polarity. It includes integrated protection and control circuits with output overload and short circuit protection. It has a SHV connector on the front side for High Voltage connection.
Full software control of parameters are available via the VMEbus.

The full specification is available on the iseg Spezialelektronik GmbH company website [Manuals: VHQ STANDARD] (499,7 kB).

Setup

There are 4 templates available for the different VME modules:-

• VHQ202M.template
• VHQ203M.template
• VHQ204L.template
• VHQ205L.template

The simplest method to obtain the correct version of the template file is to use the "getCommons" program. This requires a file called COMMON_FILES in your development directory.

The COMMON_FILES file has the following structure:

Create a substitution file and define the macro parameters needed

Five macronames have been defined for these templates:-

Macroname	Typical Values	Description
DEVICE	EXAMPLE-202M	The device name used to generate the PV names
cardN	0	Card number in the VME Crate
Mh	3000	This value depends on the M-h option for the template which is used. See the notes in the example substitution file
HOPRVA	2000	High Operating Range for Voltage A See the notes in the example substitution file
HOPRVB	2000	High Operating Range for Voltage B See the notes in the example substitution file
SIMM	NO	Default is NO, for Simulation use YES
SIML	VHQ-TST	PV name for Simulation mode. With the default of "NO", SIML pv link name is ignored

Graphical Interface

There is a MEDM engineering gui defined for this application, G_VHQ.adl.

	It can be started with the following invocation:- medm -x -macro VHQ-MODEL=VHQ202M,DEVICE=EXAMPLE-202M G_VHQ.adl with correct values for the macro names VHQ-MODEL and DEVICE VHQ-MODEL macro can take the following names VHQ202M, VHQ203M, VHQ204L or VHQ205L Fore each channel the required voltage is selected on the thumbwheel switch. The required voltage ramp speed can be selected by entering its value. The required current soft limit is also selectable.
The GUI shows when the voltage selected has exceeded the hard voltage limit by displaying a yellow background around the hard limit information. Select a lower voltage on the wheelswitch or change the hard limit on the VME card.
	A striptool like display is started by the Strip button on the GUI. This display shows the Voltage, Current and Power supplied by the selected channel.

Alarms

For each VME Module the following alarms are defined in the alh template:-

• $(DEVICE):ChanErr-A - Error on Channel A.
• $(DEVICE):ChanErr-B - Error on Channel B.
• $(DEVICE):Actual-VA - Channel A Voltage exceeded limit.
• $(DEVICE):Actual-IA - Channel A Current exceeded limit.
• $(DEVICE):Actual-VB - Channel B Voltage exceeded limit.
• $(DEVICE):Actual-IB - Channel B Current exceeded limit.

When used in an application the alh alarm file must be created using the correct device names.

Changelog

Changes to the software are shown here Software Changelog.