Output Board Calibration; 0/4-20 Ma Pwa Output Board - Honeywell HercuLine 10260A Installation, Operation And Maintenance Manual

10260A Series Actuators Installation, Operations, and Maintenance Manual

4.8 Output Board Calibration

The 10260A Series Actuator is available with one of three output boards. The first is the 0/4-20 mA Output
board, the next is the Slidewire Emulation board. Finally, there is a basic NO output board that provides
signal conditioning and CW/CCW reversing circuitry for the non-contact sensor. (This is used on models
with 0/4-20 mA input and no output.)

4.8.1 0/4-20 mA PWA Output Board

The 10260ASeries Actuator comes already calibrated from the factory. If it becomes necessary to do a
calibration in the field, adjust the 4-20 mA output using the procedure below.
1. Locate the 4-20 mA output board that is positioned over the control shaft.
2. If actuator is set for CCW operation, position the actuator to 0 % span (either manually with the
handwheel or auto/manual switch or for units with a Motor Positioner board, by inputting 0/4 mA
input signal) and go to step 3. If actuator is set for CW operation, it will need to be set back to CCW
operation to do the first step of the calibration. To set drive to CCW operation, see Section 4.9, Step 1
only. Position the actuator to 100 % of span on the right hand side scale pointer manually or with the
auto/manual electric switch or for drives with a Motor Positioner board, input a 0/4 mA input signal.
3. Connect a precision voltmeter, + and – leads, to a 250 ohm shunt resistor on the 4-20 output signal
terminals on the terminal block (Refer to Terminal Block Wiring diagram to locate terminals).
4. Read the voltage. The reading should be at 1 volt ± 0.75 % of span (± 0.03 volts for 1 – 5 volt output).
5. If the reading is incorrect, adjust R2 (see Figure 4-6) until the reading is in line.
6. Position the actuator to 100 % (0 % for CW pointers) of span and make another reading.
7. The voltage should read 5 volts, ± 0.75 % of span (± 0.03 volts).
8. If the reading is incorrect, adjust R1 (see Figure 4-6) until the reading comes into line.
9. You must then reposition the actuator to the 0 % (100 % for CW pointers) of span position and take
another reading.
10. If the reading is out of line, repeat steps 5 through 8 until readings at both the 0 % and 100 % positions
are in line.
The following additional steps are for CW units only. The adjustments that are made here will cause the
actuator to reposition itself, similar to the Motor Positioner board adjustments. The actuator must be
powered and must be in auto mode.
11. Set actuator back to CW operation. Switch the W10 jumper back to the 2_3 position and select "CW"
on the terminal block CW/CCW switch.
12. Set the actuator to the 0 % position either manually with the handwheel or auto/manual switch or for
units with a Motor Positioner board, by inputting a 0/4 mA input signal. Output should read 1 Vdc,
± 0.75 % of span (± 0.03 volts) and actuator should be positioned at 0 % span on scale.
13. If reading is incorrect or actuator in not positioned at 0 % span, adjust R3 (see Figure 4-6) until the
reading is in line, and actuator is at 0 % position.
Adjusting R3 will cause actuator movement (for units with a Motor Positioner board) and may be
required to get actuator to 0 % position even if output is within tolerance.
14. Set the actuator to the 100 % position. Output should read 5 Vdc ± 0.75 % of span (± 0.03 volts) and
actuator is at 100 % position.
15. If the reading is incorrect or position is not at 100 %, adjust R4 (see Figure 4-6) until the reading is in
line, and actuator is at 100 % position.
38 10260A Series Actuators – Installation, Operations, and Maintenance 2/03