Oxford Instruments Mercury iTC User Manual

Handbook
November 2011 / 59-UMC0071 / Issue 01
Mercury iTC
Page 41
USER INTERFACE
Original Instructions
 Valve Gearing
Enter a value between 0 and 7 to adjust the relationship between stepper-motor
movement and valve movement. If the entered value is x, the number of stepper-
motor steps that correspond to a valve movement from fully-closed to fully-open is
2
16
/2
x
.
For example, to set 2
16
steps for 0 to 100% valve opening, enter a value of 0, i.e.
valve steps = (2
16
/2
0
). Similarly, to set 2
14
steps for 0 to 100% valve opening, enter a
value of 2, i.e. valve steps = (2
16
/2
2
).
For a typical stepper motor / gearbox combination used on OINS systems, 2
16
steps
would correspond to 3 complete needle valve shaft revolutions, 2
15
steps would
correspond to 3/2 (1.5) complete revolutions etc. However, this may vary from
system to system.
3.2.11 PID Table Editor page
Figure 3-24 PID Table Editor page with an empty table
Figure 3-25 PID Table Editor with two rows of data
See Section 12.2.7 for an explanation of PID tables.

Oxford Instruments Mercury iTC Specifications

General

Brand	Oxford Instruments
Model	Mercury iTC
Category	Controller
Language	English