Spellman MPS Series Setup guide

Issue 2 Page 1 of 16

High Voltage Power Supply

MPS 20W 1kV to 20kV SERIES

SAFETY AND INSTALLATION

INSTRUCTIONS

Document number: 80552-4

Issue

Date

16/06/09

18/06/09

Issuing Authority

I-1518

5732U

Checked

Approved

Spellman High Voltage Electronics Limited

Company Confidential

This document must not be copied or distributed without express permission from Spellman High Voltage

Electronics Limited

Tel : +44 (0)1798 877000

Fax : +44 (0)1798 872479

e-mail : hvsales@spellmanhv.co.uk

Broomers Park, Broomers Hill Lane

Pulborough, W. Sussex, RH20 2RY

Issue 2 Page 2 of 16

CHANGE HISTORY

Section

Reason for Change

Issue

All

Original

5 – table 1

Output impedances changed to 2k2.

Issue 2 Page 3 of 16

SAFETY

DANGER

HIGH VOLTAGE

RISK OF ELECTROCUTION

Observe extreme caution when working with this equipment

High voltage power supplies must always be

connected to a 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

When maintenance of equipment fitted with this

power supply requires removing the equipment

cover with the power on, this should only be done

by qualified personnel aware of the hazards

This power supply has no user serviceable parts.

Return to supplier for servicing

Issue 2 Page 4 of 16

1 Unit Description

The MPS series of high voltage dc-dc converters is a range of units designed to produce a

high quality dc output for a very wide range of instrumentation and analytical applications. The

combination of linear and switch mode power conversion techniques provide low noise

and high efficiency. The unit also offers excellent ripple and stability specification. The

standard unit incorporates the ability to pre set the output or control it over the full output

range with good linearity performance. A differential input is also available to eliminate

system noise problems.

The units are designed for operation from a 24V dc input and will supply up to 20W of output

power. The HV output is via a 1m long un-terminated URM76 LSF screened cable. The

signal and power inputs and outputs are via a 15 way male ‘D’ connector but the pinout of

this connector varies according to the model type.

Three factory configured options are available :-

/VCC : Voltage and Current Control option, allowing current control of the unit.

/DCC: Digital Control Card option with digital control and monitoring (factory

configured to either RS232 or RS485 interface standards, 9600 baud).

The part number for the unit describes its main characteristics :-

MPS 20 N 20 / 24 / DCC

Model type

Max o/p kV

Polarity

Max o/p

power (w)

Input voltage

Options

Issue 2 Page 5 of 16

2. Safety

The HV output of the unit is hazardous and the conditions of this manual must be complied

with to maintain safety. The unit is contained in an earthed case with a screened HV

output cable and the HV output cable must be terminated safely before the unit is

operated. This unit must be sourced with a double insulated 24 V dc supply.

The unit shall be properly bonded to the main protective earthing termination in the end

product.

The unit has been evaluated for use in a Pollution Degree 2, Installation Category II

environment.

Consideration should be given to conducting the following tests with the unit installed in

the end product:

a. Dielectric Voltage Withstand Test, between live parts of the unit and the

end product chassis.

b. Permissible Limits Tests with the unit installed in the end product.

c. Temperatures on power electronic components, transformer windings and

accessible surfaces.

The case performs the function of heat sink and can exceed 60 C, therefore accessibility

should be prevented during operation.

3. Explanation of Symbols

This symbol means Caution, risk of

danger and the installation manual

should be consulted before

proceeding.

This symbol means Caution, risk of electric shock.

This symbol indicates the Functional Earth (ground) terminal.

This symbol means Caution, hot surface

Issue 2 Page 6 of 16

4. Applicable standards

The unit is CE marked and the standard units are UL listed.

The Standards applied are:

BS EN61010-1: 2001 and UL61010A-1

Safety requirements for electrical equipment for measurement, control and

laboratory use.

Issue 2 Page 7 of 16

5. Installation

The connector details on the standard unit and VCC versions are shown in table 1

overleaf. The DCC version is shown in table 2. See section 5 for more information on various

connection methodologies.

Table 1 : Non /DCC units connector pin-out

Signal Name

Parameters

Power Ground

+24Vdc Input

+24Vdc @ 2 amp maximum

Voltage Monitor Output

0 to 10 Vdc equals 0 to 100% of rated output, Zout =

2.2kΩ

Local Programming

Potentiometer Wiper Output

Potentiometer connected to +10Vdc reference and

ground, 0 to 10Vdc adjustable wiper output provided

Voltage Program Input

0 to 10 Vdc equals 0 to 100% of rated output, Zin =

10MΩ

Voltage Program Differential

Amplifier Output

0 to 10 Vdc equals 0 to 100% of rated output, Zout =

2.2kΩ

Voltage Program Differential

Amplifier Input – Positive

0 to 10 Vdc differential between pin 7 and pin 9 equals

0 to 100% of rated output, diode clamped to ground,

Zin = 38kΩ

Current Monitor Output

0 to 10 Vdc equals 0 to 100% of rated output, Zout =

2.2kΩ

Voltage Program Differential

Amplifier Input - Negative

0 to 10 Vdc differential between pin 7 and pin 9 equals

0 to 100% of rated output, diode clamped to ground,

Zin = 38kΩ

Internal Connection

Do Not Use

Current Program Input

Standard: Internally connected to provide 110% fixed

current limit

VCC Option: 0 to 10 Vdc equals 0 to 100% of rated

output, Zin = 1MΩ

Enable Input

Low = Enable. TTL, CMOS, open collector compliant

Internal Connection

Do Not Use

Internal Connection

Do Not Use

Signal ground

Ground for program and monitor signals

Issue 2 Page 8 of 16

Table 2 : /DCC units connector pin-out

The unit is contained in an earthed case, which should be securely mounted and the HV

output cable must be terminated safely.

Signal Name

Parameters

Power/Signal Ground

Ground

+24Vdc Input

+24Vdc @ 2A maximum

Voltage Monitor Output

Not used

Local Programming

Potentiometer Wiper Output

Potentiometer connected to +10Vdc reference and

ground, 0 to 10Vdc adjustable wiper output provided

Internal Connection

Do not connect

Voltage Program Differential

Amplifier Output

Not used

Voltage Program Differential

Amplifier Input – Positive

Not used

Current monitor output

Not used

Voltage Program Differential

Amplifier Input - Negative

Not used

Internal Connection

Do not connect

Current Program Input

Not used

Enable Input

Low = Enable. TTL, CMOS, open collector compliant

Internal Connection

Do not connect

TxD

Transmit data (output) wrt pin 1

RxD

Receive data (input) wrt pin 1

Issue 2 Page 9 of 16

Mechanical Outline 1kV to 10kV units.

150.0

95.0

Fixing face

15w D-plug

Customer Adjust Point

70716

TOP OF UNIT

33.5

SIDE OF UNIT

CALIBRATION

VOID IF SEAL

BROKEN

69.0

MOUNTING HOLE TEMPLATE

VIEWED FROM TOP OF UNIT

(NOTE - Max thread depth into unit is 5mm)

Unit Footprint

HOLE Ø3.5mm

IN 3 POSITIONS

8.0

48.0

46.012.0

Issue 2 Page 10 of 16

Mechanical Outline 15kV to 20kV units.

185.0

95.0

Fixing face

15w D-plug

Customer Adjust Point

70972 iss A

TOP OF UNIT

33.5

SIDE OF UNIT

CALIBRATION

VOID IF SEAL

BROKEN

64.0

MOUNTING HOLE TEMPLATE

VIEWED FROM TOP OF UNIT

(NOTE - Max thread depth into unit is 7mm)

Unit Footprint

HOLE Ø4.5mm

IN 3 POSITIONS

12.0

44.0

46.012.0

Fixings

M3 x 0.5 blind inserts, maximum thread depth 5mm. (1kV – 10kV)

M4 x 0.7 blind inserts, maximum thread depth 6.5mm. (15kV – 20kV)

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