Magnescale MJ100, Manual, Page: 34 / 64

10
(E)
• In order to increase accuracy in reproducing the synchronized
reference point, be sure that the speed at which the scale passes
through the reference point is the same when detecting the
reference point at the beginning of work as when the reference
point was originally set.
• Th
e maximum reference point response speed when a
SET-P16-1 is connected to the MJ100/110 is 60 m/min.
• Use a reference point travel speed of 1 mm/s or more when
setting the reference point and when detecting the reference
point.
3-5. Maximum Response Speed
Th e output phase diff erence of the MJ100 changes continuously in
increments of 50 ns beginning from 100 ns for the MJ100 and in
increments of 50 ns beginning from 1 μs for the MJ110.
Since the maximum response speed is determined by the output
phase diff erence and resolution, the correlation between these
factors is as shown in the graph in Fig. 5-1.
Th
e alarm signal is generated when the maximum response speed
is exceeded.
Although the alarm signal is output when the minimum phase
diff erence falls below 100 ns (MJ100) or 1 μs (MJ110) , it may
be output even when the phase diff erence is higher than this if
acceleration is excessive.
Note
Although the open collector output signal of the MJ110 varies
depending on the cable length and load resistance, the output may
not be able to follow quick fl uctuations in timing depending on the
performance of internal ICs. For this reason, the A/B quadrature
signals may not be output normally and may be unreceivable by
the receiver during that time before the speed alarm is output.
(See 3-2-3 regarding output phase diff erence.) For the MJ110, an
alarm signal is output when the phase diff erence falls below 1 μs.