Chapter 3 Mechanical and Electrical Installation
-36-
3) Wiring of control terminal:
A. Analog input terminal:
Generally, it is required to use shielding
cable and the wiring distance shall be as
shorter as possible (not longer than 20m), as
the weak analog signal is especially prone to
the external interference. As shown in the
following figure:
Less than 20 Meters
Potentiometer
Fig.3-9 Schematic Diagram for Connection of
Input Terminal of Analog SignalIf there is
severe interference in the analog signal, filter
capacitor or ferrite magnetic ring shall be
added to the analog signal side. As shown in
Fig.3-10 Wiring diagram for adding filter to
analog input terminal
Cross in the Same Direction or Wind
2 to 3 Coils in the Same Direction
External Analog
Source
Ferrite Magnetic Ring
Fig.3-10 Wiring diagram for adding filter to
analog input terminal
B. Digital input terminal:
The ON/OFF statuses of these terminals
are judged by the received digital signal of
inverter. Hence, the external contact shall be
the connection point with high reliability for
conducting weak signal.
If the ON/OFF signals to the digital input
terminal of inverter are provided by open
collector output, it is necessary to take the
error acts caused by power interference into
consideration. It is recommended to use the
contact control mode.
C. Digital output terminal:
When the digital output terminal needs
the drive relay, absorption diode shall be
installed at the two sides of the relay coil.
Otherwise it may damage DC 24 power
supply easily.
Note: The absorption diode shall be
installed with correct polarity, as shown in
Fig.3-11. as shown the following figure.
Otherwise, when there the digital output
terminal has output, the DC 24V power supply
and output circuit will be damaged
immediately.
Relay
Diode
Fig.3-11 Schematic diagram for connection
of digital output terminal
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