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Set Up and Calibration Procedures
Calibration
76 HercuLine™ 2000 Series Actuator - Installation, Operation and Maintenance Manual Revision 7
7/08
Table 30 Potentiometer Position Sensor Calibration Procedure
Step Action
1 Remove AC power to the actuator.
2
Remove the six screws and the top cover from the actuator case. See Figure 2.
Lay extended cover assembly on a flat surface. Remove relay cards if present.
3 Reapply AC power to the actuator.
4 Press SET UP key to access the INPUT set up group.
Press FUNCTION key until the lower display reads Direct.
Press the
or keys to set Actuator Rotation direction to CCW.
NOTE: Actuator direction must be set to CCW for this procedure. Direction can be changed
after calibration is complete.
5
Drive the actuator to the 50% position (this refers to the position on the actuator scale for CCW
rotation). This should be done manually with the handwheel or with the AUTO - MANUAL
switch.
6 Press SET UP key until the display reads CAL POSOUT.
Press the FUNCTION key until the dispaly reads DIS CALPOS.
Press the
or keys until the lower display reads BEGN CALPOS.
Press FUNCTION key.
The upper display now shows the output of the position sensor in Volts.
7
Loosen the set screw at the end of the switch camshaft where the potentiometer connects to
the shaft.
8
Using pliers, adjust the white plastic knob on the back side of the potentiometer so the voltage
in the local display is 2.500 ± 0.010 volts dc.
9 Tighten set screw with an allen wrench.
10 Press DISPLAY key to exit calibration mode.
11 Remove AC power to the actuator. Reinstall relay cards If present.
12 Install a new gasket and replace extended cover. Secure to actuator with screws.
13 Continue with calibration procedure in Table 31.