Document No. 129-401
Installation Instructions
January 18, 2008
Span Adjustment
Set the OPE/MAX/MIN slide switch to MAX. The
blue MAX trim potentiometer can now be gently
adjusted to the required maximum position. Return
the OPE/MAX/MIN slide switch to OPE for operation.
Example of limit switch I and III
and trim potentiometer settings
Switch III setting
Switch I setting
0 deg.
EA0562R1
MIN trim potentiometer setting
MAX trim potentiometer setting
90 deg.
Figure 6. Switch Cam and Trim Potentiometer
Setting.
NOTE:
The actual minimum and maximum modulating
range is determined by either the setting of the
MIN and MAX trim potentiometers, or the
setting of Switch Cam III (Minimum) and
Switch Cam I (Maximum). The actuator can
never modulate outside of the range set by
switch cam I and III. If the MIN and MAX trim
potentiometers are set outside the setting
range of switch cams I and III, then the switch
cam settings determine the modulating range
(See Figure 6).
NOTE:
Switch Cam I must not be set higher than:
90
°
when using feedback potentiometers
ASZxx..803, or ASZxx.30;
135
°
when using feedback potentiometers
ASZxx.833, or ASZxx.33
Electronic Linearization Function
Butterfly valves have non-linear flow characteristics.
Near the fully closed position, a small change in the
valve’s position will produce a very large change in flow.
Furthermore, near the fully open position, a large
position change will produce a relatively small change in
flow.
The linearization function is intended to minimize the
initial steep flow curve characteristics of a typical
butterfly valve. With jumper J1 in position 1 (upper
position), the linearization function is enabled.
Consequently, the actuator will make smaller rotational
movements when subjected to lower input signals and
larger rotational movements when subjected to higher
input signals.
For example (based on a 90
°
modulating range), a
change in input signal from 4 to 8 mA will cause a
rotational movement of 11.25
°
. An equal change from 16
to 20 mA will cause a rotational movement of 45
°
. Thus,
with the linearization function enabled, the change in
flow is closely proportional to the change in input signal.
With jumper J1 in position 2 (lower position), the
linearization function is disabled. When disabled, the
rotational movement of the shaft is proportional to the
input signal.
Input Signal Override
Line voltage to terminal P will drive the actuator to a pre-
set adjustable position, overriding all modulating input
signals. Use the potentiometer marked POS to adjust
the override position to any setting within the setting
range of switch cams I and III.
Parallel Operation
To configure the actuator for parallel operation, set the
jumper J2 in position 1 (upper position). Input signals Y0,
Y1, Y2 or Y3 are directly shunted to output signals U1,
U2 and U3, respectively. All output signals are available
regardless of which input signal is applied.
Master/Slave Operation
To configure the actuator for master/slave operation, set
J2 in position 2 (lower position). The output signals U1,
U2 and U3 reflect actual shaft position.
Split Ranging
AGA56.9… circuit boards have a modulating signal shift
feature, which can be used for split ranging. If no signal
is present on Y0, Y1, Y2 or Y3, the actuator will
modulate through the full rotational range in response to
a 12 to 20 mA signal applied at ZF. If a maximum signal
is present on Y0, Y1, Y2, or Y3, then the actuator will
modulate through the full rotational range in response to
a 4 to 12 mA signal applied at ZF. (Maximum signal can
be easily achieved by bridging terminals U4 and Y0.)
See Figure 9.
Siemens Building Technologies, Inc.
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