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3. SIGNALS AND WIRING
(b) Connections and waveforms
1) Open collector system
Connect as shown below.
SG
SD
Servo amplifier
VDD
PP
NP
OPC
Approx.
1.2k
Approx.
1.2k
(Note)
Note. Pulse train input interface is comprised of a photo coupler.
Therefore, it may be any malfunctions since the current is reduced when connect a
resistance to a pulse train signal line.
The explanation assumes that the input waveform has been set to the negative logic and forward
and reverse rotation pulse trains (parameter No.21 has been set to 0010). The waveforms in the
table refer to (1) (a) in this section are voltage waveforms of PP and NP based on SG. Their
relationships with transistor ON/OFF are as follows.
(ON)(OFF)
(ON) (OFF) (ON) (OFF) (ON)
(OFF)
Forward rotation
pulse train
(transistor)
Reverse rotation
pulse train
(transistor)
(ON)(OFF)
Forward rotation command Reverse rotation command
(OFF)