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3. SIGNALS AND WIRING
(b) Connections and waveforms
1) Open collector system
Connect as shown below:
Approx.
1.2k
Approx.
1.2k
SG
SD
NP
PP
OPC
VDD
Servo amplifier
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 (a), (1) 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)