Calibration Procedures
2/03
10260A Series Actuators – Installation, Operations, and Maintenance
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4. Calibration Procedures
4.1 Overview
Calibration of the 10260A Series Actuator may consist of setting the limit and auxiliary switches,
calibrating the non-contact sensor, calibrating the motor position board that positions the actuator with 0/4-
20mA input signal, and calibrating the slidewire emulation output or the 0/4-20mA output signal.
In calibrating the non-contact position sensor assembly, it is necessary to determine whether the actuator
actuation is rotating in a clockwise or counterclockwise direction with increasing control signal. Clockwise
and counterclockwise rotation is the direction of the output shaft when facing the end of the shaft and refers
to the direction of rotation on increasing signal. All actuators are shipped in a default configuration for
counterclockwise operation. Counterclockwise operation moves the shaft (and the pointer on the left-hand
scale) in a counterclockwise direction on increasing signal and clockwise on decreasing signal. Simply
changing the toggle switch position on the terminal plate and a jumper on the output board (NCS) or
interchanging potentiometer leads at the terminal board (film potentiometer) (see section 4.7) will change
the actuator from counterclockwise operation to clockwise operation.
WARNING
Calibration should be performed by qualified personnel only.
4.2 Setting End-of-Travel Limit Switches (actuators mfd. pre-1/1/03)
WARNING
While the unit is powered, a potentially lethal shock hazard exists inside the case.
ATTENTION
The first two cams (starting from the back) are for the 0 % and 100 % limit switches and should not need
any adjustments as they are factory set to stop the drive at 0 % and 100 %.
To adjust the limit switch cams (See Figure 4-2):
1. Remove the cover. (Non-contact sensor and terminal cover, see Figure 1-1.)
2. Turn the locking nut, found behind the sensor, counter-clockwise using a 1/8” allen wrench or the
equivalent inserted into the radial holes in the locking nut until it is possible to turn the cams with your
fingers.
3. Using a slotted screwdriver on the slots at the edge of the cams, or your finger, rotate the cams until the
switches are set. (See Figure 4-1.)
•
Rotate the actuator shaft, using the manual handwheel or the auto/manual switch, to the 0 %
position (this is the 0 % for CCW operation using the left-hand scale or 100 % for CW operation
using the right hand scale). If the actuator is installed on a damper or valve, also make sure that
this position is synchronized with the travel of the final control element.
•
Rotate the #1 limit switch operating cam to activate at this position. The switch roller arm should
go from being in an up, not depressed state, to a depressed state as the cam is rotated in the
direction of the shaft rotation going toward the limit position. This will cause the switch to go
from NC to NO and turn off the power to the motor when the switch activates. Switch activation
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