Use As A Positioner With An Analogue Control Signal (Depending On Model); Input Signal; Setting Of Deadband Value; Fail-Safe Position - Bernard Controls SQ Manuel De Mise En Service

To select the signals' direction of variation and type
Select change in the MENU and turn to OK to confirm.
Select position in the CHANGE menu and turn to OK to confirm.
Select opt. posit. signal in the POSITION menu and turn to OK
to confirm.
Choose signal's direction of variation and turn to OK to confirm.
Select signal type and turn to OK to confirm.
28 USE AS A POSITIONER WITh AN ANALOGUE CONTROL SIGNAL
(DEPENDING ON MODEL)

28.1 INPUT SIGNAL

On some models, the actuator can operate as a
positioner using a proportional command, such as a
4-20 mA analogue signal.
The input signal is automatically calibrated on the
actuator's stroke (0 - 100%) and so there is no need
to adjust the actuator's operating range.
The input signal is isolated from the on/off
commands and from the remote position signal.
The actuator can still be operated in on/off mode
with the open, close and stop
commands or using proportional control. One of the auxiliary commands must be used to select
between these two control modes.
In the standard configuration, auxiliary command is set for AUTO
/ ON-OFF to allow the control mode to be selected remotely:
AUTO = proportional control (analogue) or ONOFF= on/off
control. See section 15.2 for configuration details and informa-
tion on using this command.
Control signal
4-20 mA, 0-20 mA, 4-12 mA, 12-20 mA or 0-10 V
To select the signals' direction of variation and type:
Select change in the MENU and turn to OK to confirm.
Select positioner in the CHANGE menu and turn to OK
to confirm.
Select signal type in the POSITIONER menu and turn to OK
to confirm.
Choose signal's direction of variation and turn to OK to confirm.
Choose signal type and turn to OK to confirm.
With 0-10 V signals, two contacts are also switched to OFF.
The contacts are located on the INTELLI+ board (supporting
the display) inside the control unit.
30
OPT POSIT SIGNAL
signal ( ) opening
signal ( ) opening
SIGNAL ( ) OPENING
(4-20 mA)
(0-20 mA) / (0-10V)
(4-12 mA)
(12-20 mA)
Input impedance
Signal
(Ohms)
4-20 mA 160
0-20mA 160
4-12mA 160
12-20mA 160
0-10V 11000
-
30 4 - 20 mA
0 - 20 mA
+
31 0 - 10 V
SIGNAL RANGEL
signal ( ) opening
signal ( ) opening
SIGNAL ( ) OPENING
(4-20 mA)
(0-20 mA) / (0-10V)
(4-12 mA)
(12-20 mA)
51
ON mA
A
B
Volt

28.2 SETTING OF DEADbAND VALUE

The deadband value is the maximum allowable difference between the signal and the actuator
position when no action occurs.
This setting is made at the factory, but it is possible to adjust it.
If the deadband is too narrow, the actuator could start hunting, i.e opening and closing around the
expected position without being able to stabilise. If the deadband is too wide, positioning actions
are less precise.
The default deadband setting is 1%.
Select dead band % in the POSITIONER menu and turn to OK to confirm.
Use the blue selector to increase or decrease the value. Turn to OK to confirm.

28.3 FAIL-SAFE POSITION

When a 4-20 mA input signal is used, it is possible to set up a
fail-safe position for use if the control signal is lost.
Caution: this function cannot be used with 0-20 mA signals,
as the system cannot distinguish between a lost signal and a
0 mA value.
This function is active in the standard configuration, and the actuator remains in position if the
signal is lost.
The user can also choose open or close. Select lost signal in the POSITIONER menu and turn to OK
to confirm. Select the action required and turn to OK to confirm.

28.4 PROPORTIONAL PULSE MODE

INTELLI+ incorporates a positioning mode which takes account of the actuator's inertia. If the move-
ment time is too short or if the motor has excessive inertia, positioning can be improved by selecting
proportional pulse mode.
INTELLI+ calculates and corrects the motor's stopping point to reach the expected position and then
applies pulses proportional to any deviation if necessary.
This mode is used for relatively stable control actions where partial compensation can be made the
actuator's inertia. The actuator is cycled more often than with a standard command.
Select proportional pulse in the POSITIONER menu and turn to OK to confirm. Select (no) or (yes)
and turn to OK to confirm.

29 USING FIELDbUS CONTROL (DEPENDING ON MODEL)

The fieldbus interface is used for sending commands and data over a single line. Specific docu-
mentation details methods for addressing individual actuator and provides a list of addresses for
accessing all commands or data sources.
The type of interface is shown in the menu.
Lost communication can be used to configure the fail-safe po-
sition. This function is active in the standard configuration, and
the actuator remains in position if communication is lost.
The user can also choose open or close.
Select change in the MENU and turn to OK to confirm
Select bus in the CHANGE menu and turn to OK to confirm.
Select lost communication in the BUS menu and turn to OK
to confirm.
Select the action required and turn to OK to confirm.
LOST SIGNAL
(closing
(stayput)
(opening)
PROFIBUS
return
lost communication
Cmd by flieldbus
slave number
return
LOST COMMUNIC
(closing)
(stayput)
(opening)
31