Claire Corlett

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Fisher easy-Drive electric actuator setup and calibration: on/off units

Fisher easy-Drive electric actuator setup and calibration: on/off units


Hi I’m Brad Healey with Emerson Process
Management. We are here to discuss the general features and setup of the
Fisher easy-Drive electric actuator mounted on a Fischer D3 or D4 globe
valve. Today we’re going to dive into the Fisher easy-Drive electric actuator. The easy-Drive was invented to
transform onshore oil and gas production control valves and to become more
environmentally friendly. Using our patented, low-power design the easy-Drive
allows customers to power the valve using 12 or 24 volts DC and while the
valve is at rest it will consume less than one watt of power. Unlike other well
field designs, the easy-Drive electric actuator is highly responsive and
can stroke from fully open to fully closed in under six seconds. Easy-Drive
is capable of reaching all rated shutoff capabilities for the Fisher field-proven
D3 and D4 valve models. Using the D3 and D4 valve designs also provides an easily
retrofitable option to replace your existing pneumatic equipment. As you can
see, on the inside of the actuator casing there is no exposed wiring and all the
moving parts are enclosed within the gearbox. For demonstration purposes, we
have cut away part of the gearbox on the D4 assembly. Here you can see that the
interior of the gearbox is clutter free and rather simple. For demonstration
purposes part of the skier box has been cut away. Units leaving the factory will
not have these cut away sections. As seen on the D3 assembly, each gearbox is
sealed and contained. This intuitively designed interior and gearbox assembly
allows for quick installation, setup, and calibration. We are now going to set up
and calibrate the easy-Drive. After discussing positioning and on-off
calibrations you will be able to install and commission your easy-Drive into a wide
array of applications. For safety awareness, as we move forward please
follow the safety precautions located within the instruction manual or follow
the protocol at your site. Before we get started we advise that you have a
computer that is capable of communicating Modbus RS-485 protocol. We
will be using the easy-Drive configuration software to calibrate and configure
important variables. For general field installations this is not necessary but
does allow you to program the actuator and valve settings that work best with
your application. On the table we have the D3 and D4 valves with the easy-Drive
actuator we will now connect the wiring to the terminals within the easy-Drive on
the D4 assembly. For safety purposes make sure that none of your wires are live
during this procedure. Some other wiring practice to follow include observe local
wiring requirements for hazardous location usage.
Conduit seals within 450 millimeters or 18 inches of the enclosure port are
required for explosion-proof installation. 22 to 12-gauge wire size is required. For
long wiring runs, using lower gauge wires is advised. For power any wire over 50 feet
should be 12 gauge. The actuator will demand no more than 4 amps
therefore fuse the system to 5 amps. Using shielded wire for both power and
signal connect power and analog signal shields back at the signal source. During
initial setup ensure a stable DC power source is available and sufficiently
surge protected for the application. A 4 amp minimum power supply is required. Use
of a 36 volt transient voltage suppressor is also highly recommended. When wiring an on/off unit, the power
wiring should be connected to the appropriate terminals. Again, note that
power is polarity sensitive and, therefore, make sure the power cabling
has been properly installed and grounded before attempting to power the actuator.
When operating the valve and the single dry contact mode, the easy-Drive should be
connected to the two switch wires at the common and normally open terminals.
Terminals one and two respectively. If operating the valve and the L2E dual
contact mode the easy-Drive should be wired at the common with the brown wire,
normally open with the red wire, and normally closed with the blue wire,
terminals 1 2 & 3 respectively. The valve leaves the factory calibrated and ready
to be installed in line, however, if recalibration or an
adjustment and factory settings is necessary you will need to connect the
valve via Modbus. If you are looking to further configure and calibrate the
valve via Modbus, the Fisher easy-Drive configuration software is a
user-friendly graphical user interface. Using a PC with Modbus communication
capabilities loaded with the easy-Drive configuration software will allow you to
easily access and change Modbus registers to meet calibration and
configuration needs. The easy-Drive configuration software can be found by
going to www.Fisher.com/easydrive. On the easy-Drive web page click on user tools to find the
free download. For demonstration purposes part of the skier box has been cut away. Units leaving the factory will not have these cut away sections. As seen on the
D3 assembly, each gear box is sealed and contained. As you can see we have
connected our laptop to the actuator via USB to Modbus adapter. The driver for the
Modbus output from your PC should be installed before attempting to
communicate with the actuator via Modbus. The easy-Drive configuration software has
already been installed on this computer make sure that Modbus cable is leaving
your computer are securely fastened to the Modbus terminals
on the circuit board. If power is being supplied to the board then the easy-Drive configuration software will automatically connect to the easy-Drive
upon startup. In the event that the configuration software has been pulled
up and much of the screen is greyed out then you will need to first go to serial
port settings in the menu bar of the program. Once there, use the scroll down
menu to look for the communication device. If it is not present then go to
Device Manager within the PC to make sure that device has been properly
connected and the driver has been successfully installed. Once that has
been completed, use the correct baud rate for your device ours is 9600 and at an
even parity. If the easy-Drive is not connected then go to easy-Drive
selection within the menu bar and search for the easy-Drive. if the easy-Drive is
not found please contact your local Emerson sales office and now that you
are connected to the easy-Drive you should see the application has been populated.
Again this configuration software is a graphical user interface that
intuitively publishes the Modbus registers. You can change variables such
as fail position, low treble cutoff, and the percent deadband you’d like to give
the actuator. Also note that Modbus registers can be configured using any
Modbus master such as a flow computer, a PLC, or another PC.
All the Modbus registers are outlined in detail within the instruction manual
that comes with the valve or they are published online. We will now be discussing calibrating
an on/off unit using digital inputs and the easy-Drive configuration software.
Initiating calibration procedures will cause your valve to move. If the valve is
installed in line be careful this does not cause an accident or an upset in
your process. No real calibration is necessary when using the easy-Drive and
on/off modes. The valve has been configured to the L2E
dual dry contact mode at the factory, however, it is beneficial to configure
the valve to the correct on/off mode depending on your application. For the
first on/off mode single dry contact achieves continuity across terminals one
the common and two the normally open. When these are in continuity or the
voltage differential between these terminals is zero, the valve should
respond by opening. Once a connection between the common and normally open has
been broken the valve should move to the closed position. Using these wires we are
demonstrating a contact closure. The second type of on/off mode is the L2E
dual dry contact mode. This uses the common normally open and normally closed
terminals which are terminals 1 2 & 3 respectively. We will use the Fisher L2E
electric level controller to demonstrate this connection. Notice when the
controller is not activated terminals 1 & 3 are in continuity and the valve is
closed. For this example we will trigger the easy-Drive by activating the L2E.
Once the L2E has been activated, continuity is made across terminals 1 &
2 and the valve begins to open. Once the displacer is no longer activated,
continuity returns to terminals 1 & 3 and the valve will close. Any time the easy-Drive is in the on/off mode it will be configured to either a single dry
contact mode or the L2E dry contact mode. This can be achieved by changing
certain Modbus registers that are published in the instruction manual but
most easily done with the help of the easy-Drive configuration software.
Within the settings box make sure that the control source is set to local. Once
local is selected, the choice of either single dry contact or L2E dual contact
is presented. Select the option that best applies to your application and then
click update. Once the correct on/off mode has been selected and you click
update the easy-Drive is now ready to be commissioned in the field. For more
information on the Fisher easy-Drive electric actuator go to Fisher.com/easydrive or contact your local Emerson sales office.

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