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LFP Quick Start Guide
67
4. Adjust the
HOME AXES
>
SET HOMING POWER
value to a suitable
setting (usually 30% to 70%). The power needs to be high enough to
move the lens ring but not so high that the motor jumps out of mesh
when it reaches the hard limit of the lens ring.
With this setting, homing a lens axis (page 12) automatically moves the
lens ring to find both ends of the hard physical limit, recording the
encoder positions at each end. The homing facility then calculates the
axis range, sets the lower end to zero, and uses the range information to
set the soft limits of the axis.
When a lens axis is configured for automatic homing, you can still zero it
manually if you want, by using the relevant
DIRECT ZERO
option (page
11).
Zeroing a lens ring with a slip clutch
Some lens rings (usually focus) have no hard limit. That is, when you
reach one end of travel, such as focussing on infinity, you can continue
turning the ring and this will have no further effect as the ring slips
against the internal focussing mechanism.
For lens rings that have no physical hard limit to their range of
movement, no amount of fine-tuning of the homing power will be able to
find the point at which the ring starts to slip, so you must use manual
zeroing instead. To set up a lens axis with a slip clutch for manual zeroing:
1. Choose menu option
CHANGE MODE
>
ENGINEERING MODE
.
2. Enter the PIN (given to you by MRMC support) to access the
Engineering menu.
3. Set the menu option
HOME AXES
>
SET AXIS HOME TYPE
to
DIRECT
.
Caution
Engineering mode is for advanced users, as applying the wrong
settings here can stop the system from working. Apply the
settings carefully, and make a note of the changes so you can
revert to the previous settings if the system stops working.