Chapter 2. Wiring | VFD-VJ
2-25
Terminal Features Factory Setting (NPN Mode)
Difference
between
VJ-A and
VJ-B
AFM2
AFM
ACM
Impedance: 33.8kΩ (voltage output)
Output current: 20mA max
Resolution: ±10V corresponding to the
maximum frequency
Range -10~10V
ACM
Common ground for analog control
signals
Common ground terminal for analog control
signals
T+/ T- Motor’s thermal protection terminals Support KTY84-130, PTC130 thermal switch
New
terminal
SG+,
SG-,
SGND
Modbus RS-485
See Communication Parameters in Ch04 for
more information.
New
terminal
PE protective grounding terminal
New
terminal
Analog Input Terminals (PS, PI, QI, AUI, ACM)
Analog input signals are easily affected by external noise. Use shielded wiring and keep it as short
as possible (<20m) with proper grounding. If the noise is inductive, connecting the shield to
terminal ACM can bring improvement.
If the analog input signals (pressure sensor) are affected by noise from the hybrid servo drive,
please connect a capacitor and ferrite core closed to the hybrid servo drive as indicated in the
following diagrams. The magnetic permeability of the ferrite core should be over
5000μ to ensure
an efficient noise isolation.
Wind each wires 3 times or more around the core
Output
Transistor Output Terminals (MO1, MO2, MCM)
Make sure to connect the digital outputs to the right polarity.
When connecting a relay to the digital outputs connect a surge absorber across the coil and check
the polarity.
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