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Reflex power™ fault protection groups, Theory of operation, User application wiring – AMETEK ReFlex Fault Protection Groups User Manual

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Technical Note

ReFlex Power™ Fault Protection Groups

Document No. M380595-TN Rev A • 01/08/09

©2009 AMETEK Programmable Power, Inc. • All rights reserved. • AMETEK is a trademark of AMETEK, Inc.

9250 Brown Deer Road, San Diego CA 92121 • Tel: 858-450-0085 • Fax: 858-458-0267 • email:

[email protected]

• Web:

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THEORY OF OPERATION

Fault Protection Groups may be implemented by external user
wiring through the ReFlex Power

TM

front panel Interface

connector on each DC power module. The flexible user im-
plementation allows the creation of three basic fault group types:
Single Fault Protection Group: All ReFlex Power

TM

DC

modules externally interconnected to provide immediate
shut down all DC power module outputs upon a fault
condition in any DC power module.

Multiple Independent Fault Protection Groups: Groups

of ReFlex Power

TM

DC modules independently

interconnected to shut down of all DC power module

outputs within each independent group without affecting the
functions of other independent groups.

Multiple Dependent Fault Protection Groups: Using an

external resistor and Schottky Diode the user may create
dependent Fault Protection Groups wherein a fault in Group
A will shut down all DC power modules in Group A and
Group B, but a fault in Group B will not affect the module
outputs in Group A. The following diagram depicts the
external wiring required to create each of these Fault
Protection Group types.

USER APPLICATION WIRING

ENA

MODF-OUT

Module 1

ENA

MODF-OUT

Module 4

ENA

MODF-OUT

Module 3

ENA

MODF-OUT

Module 2

ENA

MODF-OUT

Module 1

ENA

MODF-OUT

Module 4

ENA

MODF-OUT

Module 3

ENA

MODF-OUT

Module 2

Example 1

Example 2

Single (System)

Fault Group

Multiple, Independent

Fault Groups

ENA

MODF-OUT

Module 1

ENA

MODF-OUT

Module 4

ENA

MODF-OUT

Module 3

ENA

MODF-OUT

Module 2

Example 3

Multiple, Dependent

Fault Groups

R

TBD

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

Example 1 depicts the MODF-OUT signal of Module 1
connected to the ENAble input of Module 2. This method is
repeated from module-to-module until the final module MODF-
OUT signal is connected back to the ENAble input of Module
1. A fault condition on any module will assert the MODF-OUT
signal to the next power module ENAble line, causing it to de-
assert its enable (disable) and shutdown the module output.
This chain reaction quickly disables the outputs of all DC
power modules within the system. Since the ENAble inputs
are de-asserted on all other modules in the chain, only the
module with the fault that started the sequence will indicate a
fault condition. All connected modules shall remain latched in
shutdown until the original fault condition is cleared.

Example 2 depicts two independent fault groups connected in
a similar fashion. Module 1 and Module 4 will shutdown when
either experiences a fault condition. Likewise, Module 2 and
Module 3 will shutdown when either experiences a fault
condition. However, the fault group comprised of Module 1
and Module 4 will continue to operate independently of a fault
condition with Module 2 and Module 3.

In Example 3, if either Module 2 or 3 faults off, then Modules 1
and 4 will also shutdown; however, if either Module 1 or 4
faults off, then Modules 2 & 3 will not be shut down