6-39
MHT260a (Engl.)
■ Two 90° phase-different signal (system para. 78 setting : 2)
A-phase and B-phase signal indicate rotational direction and rotational quantity, respectively.
Each edge of A-phase and B-phase signals corresponds to one pulse.
A-phase
[CA]
B-phase
[CB]
t
10
t
8
t
9
Pulse width : t
8
＞
1.25
μ
s
Pulse cycle : t
9
≧
2.5
μ
s
Edge interval : t
10
＞
1.25
μ
s
(9) System para. 79.［Basic type, SX bus (line driver output), T-link (open collector output)］
Para. Name Setting range Initial value Change
79 Output pulse count 16 to 16384 [pulse/rev] (in 1 step) 2048 Power
The pulse count in proportion to motor rotational quantity will be output.
The output pulse count can be set for the freq. dividing output terminals [FA], [*FA], [FB], [*FB], [FZ], and [*FZ].
Pulse width : t
11
≧ 1 [μs] (equivalent to 500 [kHz])
A-phase and B-phase signals are 50% duty.
The output pulse counts of A-phase and B-phase signal are determined by system para. 79 setting.
Z-phase signal is output one pulse per revolution. The pulse width depends on the A-phase output pulse count.
A-phase signal and Z-phase signal are synchronized. Recommended output frequency is approx. 500 [kHz]. The output frequency is not
restricted by the amplifier.
The position of the motor output shaft has no relation with Z-phase.
The system para. 79 sets the freq. dividing output pulse count per one rotation of motor. The output form is two 90° phase-different signal.
When the motor rotates forward, a B-phase advanced pulse is output. This does not depend on the rotational direction changeover setting
(system para. 80)
Two 90° phase-different signal is output based on the level at the time of power on.
Max. output frequency depends on the performance of IC (differential driver: AM26LS31 or equivalent) for output terminal.
A-phase [FA]
t
11
A-phase [*FA]
B-phase[FB]
B-phase[*FB]
Z-phase[FZ]
Z-phase[*FZ]
t
11
-phase
[CA]
B-phase
[CB]
Edge interval : t
10
＞ 1.25μs
Pulse width : t
8
＞ 1.25μs
Pulse cycle : t
9
≧ 2.5 μs
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