12. Description of actuator functions
12.1 Operation commands for OPEN/ CLOSE operation
Operation commands are determined by the operation command bits and
the nominal value (setpoint) of the Modbus process representation output.
Only one command bit may be set at any given time. If several command
bits are set, no operation is performed and the fault signal ‘Wrong command’
is given.
To avoid placing too much strain on the mechanics the actuator is equipped
with a (programmable) delay when changing direction (reversing preven-
tion).
The following operation command bits are required for OPEN/ CLOSE
operation:
Remote OPEN
Remote CLOSE
Remote operation OPEN / STOP
Remote OPEN = 1 The actuator runs in direction OPEN.
Remote OPEN = 0 The actuator stops.
The actuator is switched off automatically if the end position OPEN
(limit switch LSO [WOEL]) is reached.
Occurring faults (thermal protection, phase failure, torque failure) stop the
operation.
Remote operation CLOSE/ STOP
Remote CLOSED = 1 The actuator runs to position CLOSED.
Remote CLOSED = 0 The actuator stops.
The actuator is switched off automatically if the end position CLOSED is
reached (limit switch LSC [WSR] for limit seating or LSC [WSR] and TSC
[DSR] for torque seating). Occurring faults (thermal failure, phase failure,
torque failure) stop the operation.
Remote operation to setpoint position/ STOP
The positioner can only function if the actuator is equipped with a position
transmitter, e.g. potentiometer/ RWG (option).
Remote SETPOINT = 1 The actuator moves to the set nominal value.
Remote SETPOINT = 0 The actuator stops.
The setpoint must be indicated in % or in ‰ (depending on the AUMA user
parameter 2 “Measured data coding position transmitter”.
Occurring faults (thermal failure, phase failure, torque failure) stop an oper-
ation via the positioner.
With a setpoint of 0 % (0 ‰), the actuator runs to the end position CLOSED.
With a setpoint of 100 % (1000 ‰), the actuator runs to the end position
OPEN. In case the setpoint is more than 100 % (1,000 ‰) , no operation is
performed and the fault signal “Wrong command” is given.
12.2 Positioner The positioner is activated via the bit ‘Remote SETPOINT’.
The positioner is a three-position controller. Via the setpoint E1 in the
process representation output, the nominal value of the position is trans-
mitted to the actuator as nominal variable.
The positioner integrated in the actuator controls AUMA MATIC provides the
position signal for controlling the motor depending on the nominal and
actual position value. The feedback signal (actual position E2) is produced
internally within the actuator.
The position transmitter compares the nominal value of the position set in
the controls to the locally measured actual value of the position. If the differ
-
ence between nominal value and actual value is higher than the max. error
(parameter 14), the positioner drives the motor, depending on the error,
either in direction OPEN or direction CLOSE.
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Actuator controls AUMA MATIC AM/ AMExB/ AMExC
Operation instructions Modbus
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