2-20
Table 2.8 Continued
Classifi-
cation
Symbol Name Functions
Connecting Programmable Controller (PLC) to Terminal [Y1]
Figure 2.18 shows two examples of circuit connection between the transistor output of the
inverter’s control circuit and a PLC. In example (a), the input circuit of the PLC serves as
the sink for the control circuit, whereas in example (b), it serves as the source for the
control circuit.
(a) PLC serving as Sink
(b) PLC serving as Source
Transistor output
Figure 2.18 Connecting PLC to Control Circuit
[30A],
[30B],
[30C]
Alarm
relay
output
(for any
fault)
(1) Outputs a contact signal (SPDT) when a protective function has been
activated to stop the motor.
Contact rating: 250 VAC 0.3A cos φ = 0.3
+48 VDC, 0.5A
(2) A command similar to terminal [Y1] can be selected for the transistor
output signal and use it for signal output.
(3) Switching of the normal/negative logic output is applicable to the fol-
lowing two contact outputs: "Terminals [30A] and [30C] are
short-circuited for ON signal output" or "the terminals [30B] and [30C]
are short-circuited (non-excite) for ON signal output."
Communication
RS-485
port*
RS-485
communi-
cations I/O
(1) Used to connect the inverter with PC or PLC using RS-485 port.
(2) Used to connect the inverter with the remote keypad. The inverter
supplies the power to the remote keypad through the extension cable
for remote keypad.
*
This terminal can be used with standard inverters equipped with an RS-485 Communications Card (option).
-
Route the wiring of the control terminals as far from the wiring of the main circuit as
possible. Otherwise electric noise may cause malfunctions.
-
Fix the control circuit wires inside the inverter to keep them away from the live parts o
the main circuit (such as the terminal block of the main circuit).
Relay contact output
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