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BUS communication for ELQ electric actuators
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 El-O-Matic
has developed various options for the ELQ actuators in order to allow
for control via the various bus systems. Communication with these bus
systems is handled by means of electronics partially incorporated in an
expansion box mounted on the side of the ELQ.
Because the ELQ uses digital electronics for basic control within
the actuator it can easily handle bus type communications of most types
from the relatively simple systems, such as ASI (actuator sensor
interface) to the more complex systems such as Fieldbus FoundationTM,
Profibus-DP and Profibus-PA.
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Q-CFF/Q-CDPS/Q-CPAS Option |
With this ELQ option, El-O-Matic provides an electric
actuator with Fieldbus FoundationTM or Profibus-DP/PA digital field-bus
communication. Using these fieldbus options, the input and output
signals of the actuator can be sent via a two-wire connection and
connected to the control system via a fieldbus network.
For Fieldbus FoundationTM and Profibus-DP or PA, three version levels
are available for 'open/close' and 'modulating' applications.
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Open / Close Versions |
- A maximum of four digital outputs (DO) and two
analog inputs (AI) available.
- Possibility to activate or deactivate the bus
communication and open/close the actuator by conventional means.
- Standard feedback of stroke end position, signals
for opening/closing, over torque or motor-switch fault.
- Feedback of actuator temperature, run torque,
maximum torque, heater element on/off, stroke position and when the
local control unit is used.
- Read-out possibility of various identification
items.
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Pre-Set Options |
Versions fitted with the modulating positioner have the following
pre-set functions:
- Maximum of three analogous inputs (AI) available.
- Remote initialisation of actuator via bus.
- Maximum of three analogous inputs (AI) available.
- Standard digital adjustable Sensitivity/Deadband.
- Digital adjustments possible for zero range, high
and low signal, action, response curve: Linear, equal percentage or
quick opening.
- Custom curve: the ability to modify the equal
percentage or quick opening curves.
- 20-point curve: The response curve can be freely
modified based on a 20-point co-ordinate grid.
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Q-ASI Option |
This ELQ option makes it possible to open and close the actuator by
means of the 2-wire AS interface bus system and get feedback from the
stroke end positions.
- Discrete bus communication.
- No external supply voltage necessary for I/O cards.
- Explosion proof versions applicable in zones 1 and
2.
- LED indication of position and supply voltage.
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