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Equipment Control
MotAct - Description
General
The MotAct block is implemented as listed in the following table:
Software
Implemented as
Unity Pro
DFB MotAct
Vijeo Citect
Genie MotAct
UAG
SCoD MotAct
Function Description
The MotAct block is used to control electrical actuators with defined positions used
for driving valves, gates, dampers, and so on.
This block supports 3 modes of operation:
z Auto mode
z Manual mode
z Local mode
By default, the motor will be in Auto mode. The motor is forced to Auto or Local mode
if the mode selection input pin (AutoSel or LOC) is HIGH. The Local pin always
has highest priority.
When the Local mode is selected, the block functions in Local mode irrespective of
other mode selections.
If the mode selection input pin (AutoSel or LOC) is LOW, operator changes mode
of the motor from the popup of motor block. When the motor is under maintenance,
the Out of Service mode can be activated from the popup.
Auto Mode Operation
A wake-up command (Wake) is given by the GrpCtrl block to wake-up the motor
from sleep. A start-up pulse command to achieve position is given either from the
GrpCtrl or GrpStrtMgt or RouteMgt or previous device in the group.
If Direction is 0, this sets the output OP1 as HIGH and actuator starts to selected
position1.
If Direction is 1, this sets the output OP2 as HIGH and actuator starts to selected
position2.
After the start command (OP1) or (OP2) is issued to the actuator within the specified
position feedback delay, the position feedback has to be obtained.
If the position feedback is not obtained, the actuator is tripped, and an alarm is
generated. If the position feedback is obtained, the actuator stops.
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