Calibration Procedures
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10260A Series Actuators – Installation, Operations, and Maintenance
35
4.7 Motor Positioner Board
WARNING
While the unit is powered, a potentially lethal shock hazard exists inside the case.
ATTENTION
The Motor Positioner board is mounted inside the top extended cover. The cover with the Motor Positioner
board and cables still connecting it to the NCS Sensor and NCS board may be unscrewed from the actuator
housing and positioned nearby with cables connected to make adjustments.
The Motor Positioner board has been factory calibrated for 0 % and 100 % SPAN positioning. It has also
been set for default conditions given in Table 4-1.
4.7.1 Overview
The Motor Positioner board provides accurate feedback control of the actuator position proportional to a
0/4 – 20 mA input signal. It also provides selectable failsafe action, input filtering and deadband sensitivity
adjustment.
If the Motor Positioner option has been purchased by the user, its’ calibration is factory set, but may be
adjusted as a part of the 10260A Series Actuator preliminary adjustment sequence. Once all adjustments
have been made, the Motor Positioner will be fully operational.
4.7.2 Available Adjustments
Operating adjustments are located on the printed circuit board accessed by removing the non-contact sensor
and terminal cover. Altogether, there are two jumpers and five potentiometers with the following
designations and functions:
Table 4-1 Available Adjustments
Adjustment
Marking
Function
Jumper W1
Selects fail-safe actuator position. Selects full up or full
down. Remove W1 to disable fail-safe feature.
Default is “UP” position.
Jumper W2
Selects fail-safe actuator position if input signal is lost.
Selects stop, or a particular position determined by
R14. Remove W2 to disable fail-safe feature
Default is STOP.
Potentiometer Filter,
R1
Input signal filter adjustment.
Default is MINIMUM.
Potentiometer Span,
R7
Input signal span adjustment.
Potentiometer
Zero, R11
Input signal zero adjustment.
Potentiometer
Failsafe Set, R14
Adjust fail-safe position of actuator on loss of input
signal. Must be enabled by W2.
Potentiometer
D.U.Sens., R19
Adjusts actuator motor deadband from 1 % to 5 %.
Default is ½ turn OFF maximum sensitivity. (This is ½
turn off of full CCW.)
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