Magnescale MJ632, Instruction Manual

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(E)
3
MJ632
3. Function Description
3-1. Output Signals
Th e MJ632 outputs the AB quadrature signals, reference point signals, and alarm signals
as shown in Fig. 3-1.
Tw Tw Tw Tw
Tw
+
N 50 ns
A
B
1/4 reference
point signals
ALARM
N: Fluctuation due to travel speed
Resolution settings
Minimum phase difference time: Tw: 100 ns (When set to a minimum phase difference time of 100 ns)
Travel direction
reversal
High impedance
Fig. 3-1
• Th e PL101 head unit travel is detected in 50 ns increments and is output at a phase
diff erence time proportional to the amount traveled. Th e phase diff erence time changes
in integral multiples of 50 ns
• When alarm signals are detected, the alarm signals become active, and AB quadrature
signals change to high impedance.
3-2. AB Quadrature Signal Minimum Phase Diff erence Time
and Maximum Response Speed
Th e AB quadrature signal minimum phase diff erence time changes based on the travel
speed of the head unit. When a minimum phase diff erence time that is less than the AB
quadrature signal minimum phase diff erence time of your model is reached, a speed
alarm is output. (See “2-2. Model Name”.) Th
e speed just before the speed alarm is output
is the maximum response speed.
Maximum response speed (m/s)
Number of
division
Resolution
Minimum phase diff erence time
100 ns 150 ns 200 ns 250 ns 300 ns 500 ns 2.5 μs 25 μs
4000 0.2 μm 1.4 m/s 0.9 m/s 0.7 m/s 0.6 m/s 0.5 m/s 0.3 m/s 0.04 m/s —
1600 0.5 μm 3.5 m/s 2.3 m/s 1.8 m/s 1.5 m/s 1.2 m/s 0.7 m/s 0.15 m/s —
800 1.0 μm 7 m/s 4.6 m/s 3.7 m/s 3.0 m/s 2.5 m/s 1.5 m/s 0.3 m/s 0.02 m/s
400 2.0 μm 14 m/s 9.3 m/s 7.5 m/s 6.0 m/s 5.0 m/s 3.0 m/s 0.6 m/s 0.06 m/s
160 5.0 μm 35 m/s 23 m/s 18 m/s 15 m/s 12.5 m/s 7.5 m/s 1.5 m/s 0.15 m/s
80 10 μm 70 m/s 46 m/s 37 m/s 30 m/s 25 m/s 15 m/s 3.0 m/s 0.3 m/s
In models where the AB quadrature signal minimum phase diff erence time is 25 μs, the
resolutions of 0.2 μm and 0.5 μm are not available.