Overrun (inner dead band) The inner dead band determines the switching-off point of the actuator.
The tripping point in both directions can be set via the parameters 12 and
13 (page 35), so that the actuator stops as close as possible to the nominal
value.
Max. error (outer dead band)
The outer dead band determines the switching-on point of the actuator.
If the actual position or a change in nominal value is higher than the max.
permissible error set with parameter 14 (page 36), the motor is started.
The parameter must be set sufficiently high to ensure a
stable function of the positioner. If the value is set too low,
the number of starts is likely to be increased. Thus, the end
of the lifetime of the actuator and valve will be reached
sooner.
Dead time The dead time prevents the operation to a new nominal position within
a pre-defined time period. The time can be between
0 and 1 minute and is set in parameter 11.
The controls must ensure that the maximum number of
motor starts of the actuator is not exceeded. This can be
achieved by setting the parameter 11 to a sufficiently high
value.
For further information on the positioner, please refer to the operation
instructions pertaining to the actuator (multi-turn actuator SA(R).../ part-turn
actuator SG... with AUMA MATIC AM...).
12.3 Stepping mode Stepping mode requires a position transmitter (option).
The stepping mode lengthens the operating time for part of or for the whole
travel.
Setting operation and pause times as well as stepping ranges
The operation and pause times (stepping times) in opening or closing direc-
tion are set with the parameters 27, 28 and 32, 33. An individual operation
and pause time can be set for each direction.
The stepping ranges can be set separately in direction OPEN and CLOSE
(parameter 29, 30 and 34, 35).
Indication of operation in stepping mode
The states of the operation in stepping mode are indicated by the bits 2 and
3 in register 6 of the process representation input.
42
Actuator controls AUMA MATIC AM/ AMExB/ AMExC
Modbus Operation instructions
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