Allen-Bradley FLEX Ex 1797-PS1E User manual

Publication1797-5.33 - December 2003
Installation Instructions
FLEX Ex 85-253V AC In/Quad-Ex DC Out Power
Supply
(Cat. No. 1797-PS1E)
Important User Information
Solid state equipment has operational characteristics differing from those of
electromechanical equipment. Safety Guidelines for the Application, Installation and
Maintenance of Solid State Controls (Publication SGI-1.1 available from your local Rockwell
Automation sales office or online at http://www.ab.com/manuals/gi) describes some
important differences between solid state equipment and hard-wired electromechanical
devices. Because of this difference, and also because of the wide variety of uses for solid
state equipment, all persons responsible for applying this equipment must satisfy
themselves that each intended application of this equipment is acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or
consequential damages resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes.
Because of the many variables and requirements associated with any particular installation,
Rockwell Automation, Inc. cannot assume responsibility or liability foractual use based on
the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of
information, circuits, equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission
of Rockwell Automation, Inc. is prohibited.
Throughout this manual we use notes to make you aware of safety considerations.
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2FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply
Publication1797-5.33 - December 2003
WARNING Identifies information aboutpracticesor circumstances that can cause an explosion in a
hazardous environment, which may lead to personal injury or death, property damage, or
economic loss.
IMPORTANT Identifies information that is critical for successful application and understanding of the
product.
ATTENTION Identifiesinformationaboutpracticesorcircumstancesthatcanleadtopersonalinjuryor
death, property damage, or economic loss. Attentions help you:
•identify a hazard
•avoid a hazard
•recognize the consequence
S
HOCK HAZARD Labels may be located on or inside the drive to alert people that dangerous voltage may
be present.
BURN HAZARD Labels maybe locatedon or inside the drive to alert people that surfaces may be
dangerous temperatures.
Important User Information
30686
1797-PS1E

FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply 3
Publication 1797-5.33 - December 2003
About the Power Supply
The power supply is an essential component in the operation of an
intrinsically safe system. It must isolate the unsafe incoming power from the
control system and limit the available energy to IS-safe levels.
No other power source is needed to operate any components attached to the
FLEX ExTM system in the hazardous area. Power for valves, actuators, or
transmitters come from the FLEX Ex modules.
•The 1797-PS1E is a 85-253V ac in/quad-Ex dc out power supply in a
flame-proof enclosure with increased safety input/output
terminations. The 85-253V ac glan is an M20 x 1,5 and can accept a
cable from 6mm to 12mm in diameter. The Ex outputs are M16 x 1,5
and can accept a cable from 4mm to 8mm in diameter.
Features include:
•85-253V ac supply source
•four channels, 8.5W output each channel
•outputs are IS galvanically isolated from the source
•all channels are independently IS limited
ATTENTIO
N
This equipment is considered Group 1, Class A industrial
equipment according to IEC/CISPR Publication 11. Without
appropriate precautions, there may be potential difficulties
ensuring electromagnetic compatibility in other environments
due to conducted as well as radiated disturbance.
This equipment is supplied as "enclosed" equipment. It should
not require additional system enclosure when used in locations
consistent with the enclosure type ratings stated in the
Specifications section of this publication. Subsequent sections of
this publication may contain additional information regarding
specific enclosure type ratings, beyond what this product
provides, that are required to comply with certain product safety
certifications.
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4FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply
Publication1797-5.33 - December 2003
Understand System Planning
Part of system planning is determining what modules are needed for the
application, how many power supplies are needed, how to best partition the
system, and where to locate the system cabinets.
A key task in the development cycle is determining the number of power
supply outputs (thus power supplies) you will need. In the following example,
you will need eleven power outputs if you are using the fiber hub, which
requires 8.5W:
Each power supply has four independent IS power outputs capable of 8.5W
each. In the above example, we required eleven IS power outputs so three
power supplies were sufficient.
Modules Requires Modules Requires
Fiber Hub 8.5W Two Thermocouple Inputs 1.6W each
Two ControlNetTM Adapters 8.5W each Two Digital Outputs 7.5W each
Two Analog Inputs 7.5W each Three NAMUR Digital Inputs 2.8W each
Two Analog Outputs 6.3W each Two Counter Inputs 4.25W each

FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply 5
Publication 1797-5.33 - December 2003
The total number of power supplies needed depends on the modules used
and the total system configuration. The following illustration shows how this
example may be configured.
IMPORTANT Even though modules may be supplied with power from the
same power supply output channel, galvanic isolation in the
module provides module to module galvanic isolation.
Depending upon the module-type, galvanic isolation
(channel-to-channel within the module) may or may not be
provided. See the module’s specifications for more
information.
IS Pwr
S
afe Area
Hazardous Are
a
1797 power supply
1797 power supply
1797 power supply
ACNR Spare IE8 OE8 IRT8 Spare Spare IJ2 IJ2
ACNR OB4 OB4D IBN16 IBN16 IBN16 IE8 IRT8 OE8
RPA RPFM RPFM
IS 1797 I/O
IS 1797 I/O
IS 1797 Fiber Hub
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
IS Pwr
EEx d
/e EEx ib
EEx d
/e EEx ib
EEx d
/e EEx ib
41306
U
nsafe
P
ower
E
ntrance
Spare
U
nsafe
P
ower
E
ntrance
Unsafe
Power
Entrance
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6FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply
Publication1797-5.33 - December 2003
Make certain that you only connect intrinsically safe power supplies to other
intrinsically safe system modules or adapters to maintain the integrity of the
intrinsically safe backplane.
Installation in Zone 1, 22
The 1797-PS1E power supply has a protection factor of IP65. Refer to the
specifications table for the IS module type.
Application
When installing, commissioning, operating and maintaining devices or device
components of the Flex Ex system as intrinsically safe electrical apparatus in
potentially explosive atmospheres according to EN 50020, you must heed the
EC- type examination certificate and the applicable national and local
construction, installation and operating regulations.
Zone 1
The Power Supply unit can be located in Zone 1. The permissible ambient
temperature of -20°C to +70°C must not be exceeded.
Zone 22
The housing type of the power supply is applicable for the use in Zone 22. It
corresponds with the category 3D acc. to directive 94/9 EC and is marked
with a type label accordingly.
ATTENTIO
N
The power supply cannot be used in an intrinsically safe
environment after its outputs have been exposed to
non-intrinsically safe signals.
41307

FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply 7
Publication 1797-5.33 - December 2003
Commissioning, Installation
The Power Supply unit can be located in Zones 1, 2 and 22 as stated on its
label. The output circuits are according to the ignition protection class EEx ib
and can be installed in Zones 1, 2 and 22. When installing, you must heed the
EC- type examination certificate (especially the special conditions) and the
applicable national and local construction, installation and operating
regulations.
The housing (EEx “d”) must not be opened (screw cover). Connections are
made in the EEx “e” terminal box.
Install the Power feed lines only in the de-energized state. Also follow the
information on the type label, respectively the covers of the terminals.
You can connect and disconnect the intrinsically safe output terminals during
operation.
All unused cable glands must be covered by appropriate prototype tested EEx
“e” lead seals to keep the requirement of IP54.
The cover installed on the non-intrinsically safe screw terminals
(IP30) may only be removed in the de-energized state and must be
re-mounted after working on these terminals.
Before closing the cover of the EEx “e” wiring box, inspect the seal for any
signs of damage. In case of damage, the seal must be replaced by a new seal
that is identical to the damaged seal.
The power supply housing contains two flanges, which can be connected to a
wall or other structural part by means of fixing screws. Select fixing screws
that ensure secure fixing of the power supply. Consider the condition of
vibration of the power supply when making this selection.
On the EEx “d” housing there is an earthing screw. This screw must be
connected to Earth with a conductor having a minimum of 4 mm² area. The
connection has to be protected against self opening and corrosion. Corrosion
protection can be achieved by using tinned terminal ends.
Before opening the EEx “e” terminal box (e.g. for maintenance purposes), it
must be cleaned of all dust particles to ensure that no dust can enter the box.
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8FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply
Publication1797-5.33 - December 2003
Electrostatic Charge
Protect the system against electrostatic charge. Post a sign near this module:
Attention! Avoid electrostatic charge. For your convenience, a sign which
can be cut out and posted is included on the last page of these installation
instructions.
Outputs
When using an intrinsically safe electrical apparatus according to EN50020,
the European directives and regulations must be followed.
The channels in the power supply are electrically connected to each other and
have a common +V line.
ATTENTIO
N
Preventing Electrostatic Discharge
This equipment is sensitive to electrostatic discharge, which can
cause internal damage and affect normal operation. Follow
these guidelines when you handle this equipment:
•Touch a grounded object to discharge potential static.
•Wear an approved grounding wriststrap.
•Do not touch connectors or pins on component boards.
•Do not touch circuit components inside the equipment.
•If available, use a static-safe workstation.
•When not in use, store the equipment in appropriate
static-safe packaging.
IMPORTANT You cannot interconnect lines because of the intrinsic safety
requirements.

FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply 9
Publication 1797-5.33 - December 2003
Mount the 1797-PS1E Power Supply
Follow these directions to properly install the 1797-PS1E power supply. Refer
to the “Commissioning, Installation” section, page 7, for important
precautions and considerations.
1. Remove the screws on the cover of the power supply EEx “e”
terminal box to access the input and output terminals.
2. Thread the blue IS-safe output power wiring through the blue IS
compression seals.
3. Connect the blue IS-safe output power wiring to the output terminals
making sure all connections are tight.
These power supply outputs provide the input power to the FLEX Ex
modules.
4. Thread the hazardous incoming power wiring through the black
compression seals.
5. Connect the hazardous incoming power wiring to the input terminals
making sure all connections are tight.
You can daisy chain the hazardous incoming power wiring to further
supplies to simplify system wiring.
ATTENTIO
N
Use star washers and nuts to make sure you have a good
electrical connection. Scrape the paint off the back panel in
those areas where grounding bolts will be located.
ATTENTION Keep hazardous and IS-safe wiring separated in a
suitable fashion. Do not leave long, excess wiring that
could bridge between the hazardous and safe areas.
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10 FLEX Ex 85-253V AC In/Quad-Ex DC Out Power Supply
Publication1797-5.33 - December 2003
6. Replace the lid of the EEx “e” terminal box.
7. Screw the lid back into place making sure all of the screws are tight.
Customer Connections
Typical Wiring Configurations
Vin
V
out
chassis GND
IS Isolation
Hazardous to IS -V
+V Out
1
-V
+V Out
2
-V
+V Out
3
41315
IS Limiters
Voltage and Current
-V
+V Out
4
ac
Type of Power Input
IS Power Output
1
4
10
11
12
13
14
15
16
17
Daisy-chaining
+V, -V
You can use the daisy chain configuration if the
total module power draw is < 8.5W. Otherwise,
power is connected to individual modules.
Combination
Wiring when total module current
power is greater than 8.5W
41316
<8.5W
+V, -V
Other variations are possible depending
upon individual module power.
<8.5W
+V, -V
1797-PS1E
Hazardous
incoming
power
IS safe
output power
Keep wires separate