2. Actuator
ORM0043_2
Modulating Controller Application Manual
Page 5
Close
and
Hard Seat Fast
are active then only the
Command Signal
needs to be below the
Close Limit
to
hold the
Close Solenoid
active. This can be used to
ignore pulse zones and fully close the actuator quickly if
the actuator is normally in a stepping mode.
2.7 Digital Override
When
Remote Open
is active, the internal command is
set to 100% and will override the current command
signal. The controller will then position as if the
command signal had been set to 100%.
When
Remote Close
is active, the internal command is
set to 0% and will override the current command signal.
The controller will then position as if the command signal
had been set to 0%.
If both
Remote Open
and
Remote Close
are active then
they cancel each other out and the controller continues
to position based on the command signal.
Any fault condition overrides a digital override unless
Remote Override
is active. If this is set active then the
controller will operate based on the digital override
signals even if a fault has occurred.
2.8 Manual Override
When the controller is in manual mode the
Manual
Mode
output is set active.
If in manual mode and
Manual Enable
is active then the
actuator can be positioned using the control switch.
Turning the switch away sets the internal command to
100%, and turning the switch towards sets the internal
command to 0%, and the controller will position the
actuator based on these values. When the switch is
returned to the centre the internal command matches
the
Feedback
so the actuator immediately stays put. If
Manual Enable
is turned off then the actuator cannot be
positioned manually.
If
Manual Fast Pos
is active then pulse zones are ignored
and the actuator will open or close without pulsing the
solenoids. This can be used to move the actuator quickly
if it is normally in a stepping mode.
2.9 Fault Override
When the controller is in automatic mode, if the actuator
goes into fault the actuator can be forced to drive to a
required location. If
Fault Open
and
Fault Close
are both
off, or both are set active the actuator will fail last. If
Fault Open
is active and
Fault Close
is off, on a fault the
internal command will be set to 100%. If
Fault Open
is off
and
Fault Close
is active, on a fault the internal command
will be set to 0%. In both cases the controller will
position the actuator based on these values.
If
Fault Fast Pos
is active then pulse zones are ignored
during a fault and the actuator will open or close without
pulsing the solenoids. This can be used to move the
actuator quickly if it is normally in a stepping mode.
2.10 System Fault
If any fault is active in the controller then the
System
Fault
output is set active.
2.11 Feedback Signal Fault
If
Feedback
signal is in fault for greater than
Sig Fault
Delay
then
Feedback Fault
output is set active.
If
Fail On Fdbk Flt
is active then the actuator will position
based on the fault override settings. If
Fail On Fdbk Flt
is
off then the actuator will stay last.
2.12 Command Signal Fault
If
Command Signal
is in fault for greater than
Sig Fault
Delay
then
Command Fault
output is set active.
If
Fail On Cmd Flt
is active then the actuator will position
based on the fault override settings.
If
4-20mA Cmd Ctrl
is active and
Fail On Cmd Flt
is off
then the actuator will stay last.
If both
4-20mA Cmd Ctrl
and
Fail On Cmd Flt
are off then
the command fault will have no effect on controller
operation.
2.13 Common Fault
The
Common Fault
input is used to indicate than an
external fault has occurred and the controller must go
into fault mode.
If
Common Fault
is active then the
Common Fault
output
is set active and the actuator will position based on the
fault override settings. The
Aux Solenoid
output is also
set active such that and external fault can be used to
quickly fault the actuator.
If
Cmn Flt Stop Pmp
is also active then the
Pump Output
will be set off which prevents the pump from running if a
common fault is present.
