VICI Selectors (multiposition) Standard electric - Manual (Page 8)

 Controlling the Actuator with a Computer
3. Refer to Drawing 22721 on page 19. Replacing integrated circuit U2 (a
4049) with a 4050 changes the output from negative true to positive true.
(Order Valco Product No. I-IC4050.)
4. Reinstall the board in the cover and reassemble the actuator and cover,
making sure that all the wires and cables are reconnected to the Encoder
Board assembly.
When it is certain that the polarities of the actuator and the control device
are compatible, connect the 1’s wire of the actuator interface cable to the 1’s
output, the 2’s wire of the cable to the 2’s output, etc. If the timing restric-
tions for logic inputs are followed, timing of the logic outputs will also be
in accordance with
Figure 4. The signal, RUN, indicating actuation of the
valve, will go high within the period, tr (200 milliseconds maximum), after
DIS- or DIH-. RUN will remain high until the motor stops, and will then go
low. Position data at the outputs, DO1- through DO10- will be valid before
RUN returns low.
Error Signaling
Errors or faults detected by the actuator logic are signalled by the display
flashing in a coded sequence which indicates the problem. The display will
go off briefly once, twice, or three times, followed by a pause before the
cycle repeats.
1: Indicates a fatal internal failure of the microcontroller.
2: BCD position input is invalid; i.e., the position requested cannot be
found on the encoder disk. Clear by entering STEP or HOME, or a
valid position.
3: Indicates motor failure, overheating, or excessive load on the actuator.