rotork CK Series User Manual

Keeping the World Flowing
25
The Profibus DP network commands will operate the
actuator provided –
• Local/Stop/Remote selector is in ‘Remote’
• Profibus commands are not inhibited by the ‘Inhibit/DI-4’
input parameter setting and DI-4 condition
• No interlock is active
• There is no standing hard-wired control input active
• No alarm condition prevents it from moving
Open
A digital command to cause the actuator to open to the
fully open position as indicated by the Open limit switch.
Under correct operation the actuator stops either when
the open limit switch is reached, when the torque exceeds
the value set and the open limit switch has been reached,
or a new command is sent over the network.
Close
A digital command to cause the actuator to close to the
fully closed position as indicated by the Close limit switch.
Under correct operation the actuator stops either when
the close limit switch is reached, when the torque exceeds
the value set and the close limit switch has been reached,
or a new command is sent over the network.
Stop
With no other command present this digital command
causes an actuator motor that is running to stop.
Emergency Shut Down
A digital command that causes the actuator to drive to its
Emergency position. There are settings within the actuator
to determine if this is a closed, open or stay put action.
Analogue Position Demand
This function is only available over the Profibus DP
network. To initiate Analogue Position Control the
ACTCON register Position Enable bit must be set to 1 and
all other bits to 0, enabling Position mode and a value must
be written to the Position DV register (range 0-100.0%,
resolution 0.1%), the valve will open to the appropriate
amount and stop in that position (within the deadband
setting). If a subsequent digital command to open or close
the valve is issued, from any source, this will take priority
over the analogue position command. Once the set point
is reached the positioning controller is switched off, but
whilst the Profibus outputs are being written the positioner
is continuously being updated. A new value in the Position
DV register will cause a new position to be adopted and a
new bit set in the ACTCON register will cancel positioning
mode. Provided limited range positioning is not invoked,
the values 0% and 100% written to the Position DV
register produce a special case output where the command
is revised so as to fully close the valve to its tight shut off
position (0%) and fully open the valve (100%). (This feature
requires the actuator to be fitted with a DSM or MSM with
optional potentiometer). Provided limited range positioning
is not invoked, the values 0% and 100% written to the
Position DV register produce a special case output where
the command is revised so as to fully close the valve to
its tight shut off position (0%) and fully open the valve
(100%). (This features requires the actuators to be fitted
with a DMS or MSM with optional potentiometer).
Partial Stroke
The actuator will move the valve to an intermediate
position and back to the start position provided it is at
the correct end of travel position when the command is
issued. The end to start from and the amount of travel are
selected during parameterisation. (This feature requires the
actuator to be fitted with a DSM or MSM with optional
potentiometer).
Relay Output DO-1 to DO-4
These 4 commands are used to energise and de-energise
the internal relays on the extra relay indication board
(if fitted), (these outputs are referred to as S5-S8 in
the standard actuator documentation when there is
no Profibus DP Module in the actuator). The resulting
outputs can be used for operating other equipment such
as a pump or indication light. The actuator is not able to
control these relays directly from the main board when the
PFU is fitted. They will maintain their last state if power is
removed from the actuator. On restoration of power the
relays will be reset to their de-energised condition and the
coils will report ‘0’.
The Actuator Cyclic Data Signals
Most Rotork multi-turn actuators are set to open
until the open limit switch is reached and close
until the closing on torque switch trips, but it is
dependent on the type of valve. This setting can
be changed to close of torque using the HMI
or Accent.
The control room indication is always taken from
the end of travel limit switch settings.
A4 US
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A4
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A4
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rotork CK Series Specifications

General

Brand	rotork
Model	CK Series
Category	Controller
Language	English