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3. SIGNALS AND WIRING
(b) Connections and waveforms
1) Open collector system
Connect as shown below.
SG
SD
OPC
PP
NP
Servo amplifier
Approx.
1.2k
Approx.
1.2k
External power
supply 24VDC
(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 in
(1) (a) of 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)
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