Knife Lower Limit Position Varies - Horizon Fitness APC-61 Manual

2-13 Knife Lower Limit Position Varies

[Cause 1: Oil temperature variation]
When this machine is operated for a long time,
oil temperature rises and viscosity weakens.
Therefore, the speed of hydraulic cylinder
becomes slightly faster.
When knife lowering speed becomes faster,
because lower limit position becomes lower,
lower limit position needs to be rised with the
cutting depth adjust dial. When operation
begins after long break, because oil tempera-
ture returns, uncutting occurs.
[Solution]
Because knife lower limit position changes
depending on the oil temperature variation,
adjust with cutting depth adjust dial for each
time. For S/N 103001 or above, because
hydraulic unit is renewed and oil cooler is
equipped as standerd, the temperature variation
does not occur.
The oil suited to ISO VG32 should be used.
2-22
[Cause 2: The timing of lower limit position
detection]
The signal is sent with about 10msec cycle in
this machine. Therefore, the time difference at
10m sec maximum between lower limit posi-
tion detection and CPU exists.
The variation are caused by the knife moving
distance for this time.
But this variation is in allowable range.