Spirax Sarco EP500 User manual

IM-P343-46 CTLS Issue 3 1
1. Safety information
2. Technical information
3. Installation
4. Commissioning
5. Maintenance
6. Spare parts
7. Fault finding
8. Approvals
© Copyright 2017
Printed in GB
IM-P343-46
CTLS Issue 3
3.568.5275.306
EP500
Advanced
ATEX Electropneumatic Positioner
Installation and Maintenance Instructions

IM-P343-46 CTLS Issue 32
1. Safety information
Safe operation of these products can only be guaranteed if they are properly
installed, commissioned, used and maintained by qualified personnel
(see Section 1.11) in compliance with the operating instructions. General
installation and safety instructions for pipeline and plant construction, as well
as the proper use of tools and safety equipment must also be complied with.
WARNING: The maximum process fluid temperature must be suitable for
use if the unit is to be used in any potential explosive atmosphere. For the
device maintenance in a potentially explosive atmosphere, we recommend
the usage of tools which do not produce and / or propagate sparks.
1.1 Intended use
Referring to the Installation and Maintenance Instructions, product markings and
Technical Information Sheet, check that the product is suitable for the intended
use / application. These products comply with the requirements of the Directive
2014/34/EU (ATEX) for the use of equipments in potentially explosive atmospheres.
1.2 Access
Ensure safe access and if necessary a safe working platform (suitably guarded)
before attempting to work on the product. Arrange suitable lifting gear if required.
1.3 Lighting
Ensure adequate lighting, particularly where detailed or intricate work is required.
1.4 Hazardous liquids or gases in the pipeline
Consider what is in the pipeline or what may have been in the pipeline at some
previous time. Consider: flammable materials, substances hazardous to health,
extremes of temperature.
1.5 Hazardous environment around the product
Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases,
extremes of temperature, hot surfaces, fire hazard (e.g. during welding), excessive
noise, moving machinery. The positioner suitable for installation in Zone 1 or
Zone 2 ( Gas ) Zone 21 or Zone 22 ( Dust ) according to the Atex rating reported
in the following. The positioner shall not be used in zone 0.
1.6 The system
Consider the effect on the complete system of the work proposed. Will any proposed
action (e.g. closing isolation valves, electrical isolation) put any other part of the
system or any personnel at risk?
Dangers might include isolation of vents or protective devices or the rendering
ineffective of controls or alarms. Ensure isolation valves are opened and closed
progressively to avoid system shocks.
1.7 Pressure systems
Ensure that any pressure is isolated and safely vented to atmospheric pressure.
Consider double isolation (double block and bleed) and the locking or labelling of
closed valves. Do not assume that the system has depressurised even when the
pressure gauge indicates zero.
1.8 Temperature
Allow time for temperature to normalise after isolation to avoid the danger of burns.
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1.9 Tools and consumables
Before starting work ensure that you have suitable tools and / or consumables
available. Use only genuine Spirax Sarco replacement parts.
1.10 Protective clothing
Consider whether you and / or others in the vicinity require any protective clothing
to protect against the hazards of, for example, chemicals, high / low temperature,
radiation, noise, falling objects, and dangers to eyes and face.
1.11 Permits to work
All work must be carried out or be supervised by a suitably competent person.
Installation and operating personnel should be trained in the correct use of the
product according to the Installation and Maintenance Instructions.
Where a formal 'permit to work' system is in force it must be complied with. Where
there is no such system, it is recommended that a responsible person should know
what work is going on and, where necessary, arrange to have an assistant whose
primary responsibility is safety.
Post 'warning notices' if necessary.
1.12 Handling
Manual handling of large and / or heavy products may present a risk of injury. Lifting,
pushing, pulling, carrying or supporting a load by bodily force can cause injury
particularly to the back. You are advised to assess the risks taking into account the
task, the individual, the load and the working environment and use the appropriate
handling method depending on the circumstances of the work being done.
1.13 Residual hazards
In normal use the external surface of the product may be very hot. If used at the
maximum permitted operating conditions the surface temperature may reach
temperatures in excess of 167 °F..
Many products are not self-draining. Take due care when dismantling or removing
the product from an installation (refer to 'Maintenance instructions').
1.14 Freezing
Provision must be made to protect products which are not self-draining against
frost damage in environments where they may be exposed to temperatures below
freezing point.
1.15 Disposal
Unless otherwise stated in the Installation and Maintenance Instructions, this product
is recyclable and no ecological hazard is anticipated with its disposal providing due
care is taken.
1.16 Returning products
Customers and stockists are reminded that under EC Health, Safety and Environment
Law, when returning products to Spirax Sarco they must provide information on any
hazards and the precautions to be taken due to contamination residues or mechanical
damage which may present a health, safety or environmental risk. This information
must be provided in writing including Health and Safety data sheets relating to any
substances identified as hazardous or potentially hazardous.

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2. General product information
2.1 Introduction
The EP500 is a 2 wire loop powered positioner requiring a 4-20 mA control signal, and
is designed for use with linear pneumatic valve actuators. The positioner compares the
electrical signal from a controller with the actual valve position and varies a pneumatic
output signal to the actuator accordingly. A mounting kit is supplied to suit all pneumatic
actuators compliant with the NAMUR standard.
2.2 Operating principle
The current signal (1) flows in the coil (2) and generates a magnetic field which attracts the
flapper (3) tapping the nozzle (4). As a consequence of this the pressure inside the actuator
increases and the valve moves. When the valve stem (5) moves it generates through the
feedback lever (6) and the feedback spring (7) a negative feedback which moves the flapper
away from the nozzle and stops the valve movement.
Changes in the current signal will induce changes in the valve positioning.
This mechanism will build a linear correspondence between the current signal and the
valve position expressed in percentage of the valve stroke. The valve opening at 4 mA
and at 20 mA can be adjusted manually as illustrated in Figure 1.
Key:
1=Current signal
2=Coil
3=Flapper
4=Nozzle
5=Valve stem
6=Feedback lever
7=Feedback spring
8=Pneumatic relay
9=Pneumatic actuator
10 =Span lever
Fig. 1 Functional schematic
2
1
3
4
7
8
10 5
6
9

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2.3 Applications
The EP500 can be used with any actuator that conforms to NAMUR, this includes all of the
following Spirax Sarco pneumatic actuators:
- PN1000 and PN2000 series - PNS3000 and PNS4000 series
- PN9000 series - TN2000 series
2.4 Materials
Part Material Finish
Case and cover Die cast aluminium Anti-corrosive paint to RAL9006
2.5 Technical data
Input signal range 4-20 mA (split range minimum amplitude 4 mA)
Input resistance 292 Ω
Air supply 1.4 to 6.0 bar (regulate 5 to 10 psi above actuator
spring range)
Air quality Air must be free of water, oil and dust
Output pressure 0 to 100% supply pressure
Actuator stroke 10 mm to 100 mm
Action Single acting / fail vent
Operating temperature -20 °C to +75 °C
Air flow 3.20 Nm3/ h @ 1.4 bar
Steady state air consumption 0.1 Nm 3/ h @ 1.4 bar
Air connections ¼" NPT female
Sensitivity ≤ 0.2% F.S. (Full Scale)
Histerisis ≤ 0.4% F.S.
Linearity ≤ 1.0% F.S.
Repeatability ≤ 0.5% F.S
Electrical connections Cable gland M20 internal terminals for conductors from
0.5 to 2.5 mm2wire
Degree of protection IP65
Characteristic Linear
Shipping weight 2.35 kg
Material
(housing and cover) Die-cast aluminium anti-corrosion paint RAL 9016
Atex rating
II 2G Ex d mb IIC T6 Gb
II 2D Ex tb mb IIIC T76oC Db
II 2G Ex ia IIC T6 Gb
II 2D Ex ia IIIC T76oC Db
Ex ia circuits parameters Ui=30V li=110mA Pi=0.82W Li=0 Ci=0

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3. Installation
Note: Before starting any installation observe the 'Safety information' in Section 1.
This document is provided as a guide and it is recommended that it is read
thoroughly prior to installation. Also refer to the separate Installation and
Maintenance Instructions for the control valve and actuator.
3.1 Location
The positioner should be mounted in sufficient space to allow opening of the cover and
provide access to connections. When fitting to an actuator, ensure the positioner will not
be exposed to an ambient temperature outside the range -20 °C to +75 °C. The positioner
enclosure is rated to IP65. Connection of air supply pressure (1.4 to 6 bar g) and control
signal (4 - 20 mA) should be considered prior to choice of location.
3.2 Connecting up
3.2.1 Pneumatic connections
Warning: Air supply must be dry, oil and dust free. Dirty air supply may damage the product
and invalidate warranty.
For best performance, set the air supply pressure to about 0.5 bar g above the pressure
required to fully travel the actuator.
Check all connections for leaks. Please note however that the EP500 bleeds air in normal
operation at a rate of approximately 0.1 Nm³/ hour at 1.4 bar supply pressure.
Pneumatic connections are located at the right hand side of the positioner and are identified
as follows 'SUPPLY' and 'OUT':
SUPPLY - Air supply - 1.4 bar g to 6 bar g, depending upon required actuator spring range.
OUT - Output signal to the actuator.
Connections are ¼" NPT female. Interconnection between the positioner and the actuator
should be at least 6 mm OD tube.
3.2.2 Electrical connections
The EP500 only requires a 4 - 20 mA signal. Remove the front.
Note: Ensure resistance from earth post to local earth (e.g. pipework) is less than 1 Ohm.
Connection to the unit is through the M20 cable gland (as supplied), which when used with
suitable cable will ensure the IP65 protection rating. Appropriate conduit connections may
be used instead.
Connect conductors (0.5 to 2.5 mm²) to the terminal blocks and earth noting the polarity +/- .
Refer to the table below for the suitable connection:
Action 4 - 20 mA polarity EP500 terminal block
Direct +Red
-Black
Reverse +Black
-Red
Direct action - the air pressure increases when current signal increases and vice versa.
Reverse action - the air pressure decreases when the current signal increases and vice versa.

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3.2.3 Electrical connection for ATEX equipment
When the positioner is installed in hazardous areas special precautions must be taken.
In case the explosion proof protection system is used: a fuse of 100 mA should be inserted in
the circuit to provide protection against overcurrent as indicated in the drawing here below:
In case the intrinsically safe protection system is used, voltage and current should be limited
using a suitable barrier as indicated in the drawing here below:
The barrier shall be chosen in accordance with intrinsic safety parameters declared for the
EP500 positioner. Please refer to the technical sheet.
+
4-20 mA
-
+
4-20 mA
-
100 mA
Fig. 2
Fig. 3
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3.3 Mounting the positioner onto the actuator
The EP500 can be attached onto any type of valve and actuator conforming to NAMUR
standards. The unit can be attached in the traditional centered position (Figures 4 and 5) in
line with the actuator central axis or side mounted (Figures 6 and 7) to enable the operator
to view frontally the stem of the valve.
Step 1
Attach the mounting bracket on one of the two positions shown below with the two M8 x 14
screws and washers.
Centre mounting
Side mounting
Fig. 4 Fig. 5
Fig. 6 Fig. 7

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Step 2
Using the 2 off M6 pan head screws, securely attach the 'T' shaped sliding pin holder to
the valve actuator coupling block (Figure 8).
Depending on the travel of the
valve actuator and depending on
the actuator yoke, apply a medium
strength thread locker to the sliding
pin and screw into the correct hole on
the sliding pin holder and tighten. Use
Figure 9 and Table 1 to determine the
correct hole to use.
Fig. 8
Fig. 9 Feedback lever fulcrum
Table 1
The 'T' bracket can be moved towards
the right or towards the left. This
allows the adjustment as displayed
below between the lever fulcrum and
the pin:
Actuator stroke (mm) Distance between feedback
lever fulcrum and pin Feedback lever
20 70
30 70
50 80
70 80
75 115
100 115
Pin

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Step 3
Attach the bracket to the actuator with the screw M8 x 20 with washers (Figure 10).
Take care to insert the feedback pin in the slot of the feedback lever while you attach the
positioner (Figure 11)
Fig. 10
Fig. 11