Fuji Electric FRENIC-HVAC User Manual page 54

Symbol Name
 Using a programmable logic controller (PLC) to turn [X1] to [X7], [FWD], or
[REV] ON or OFF
Figure 2.7 shows two examples of a circuit that uses a programmable logic controller
(PLC) to turn control signal input [X1] to [X7], [FWD], or [REV] ON or OFF. In
circuit (a), the slide switch SW1 is turned to SINK, whereas in circuit (b) it is turned
to SOURCE.
In circuit (a) below, short-circuiting or opening the transistor's open collector circuit
in the PLC using an external power supply turns ON or OFF control signal [X1] to
[X7], [FWD], or [REV]. When using this type of circuit, observe the following:
- Connect the + node of the external power supply (which should be isolated from
the PLC's power) to terminal [PLC] of the inverter.
- Do not connect terminal [CM] of the inverter to the common terminal of the PLC.
Programmable
<Control circuit>
logic controller
[PLC] SINK
SOURCE
[X1] to [X7],
[FWD], [REV]
[CM]
(a) With the switch turned to SINK
Figure 2.7 Circuit Configuration Using a PLC

For details about the slide switch setting, refer to Section 2.3.2 "Setting up the slide
switches.")
Functions
Programmable
logic controller
Photocoupler
(b) With the switch turned to SOURCE
2-21
2.3 Terminal Specifications
<Control circuit>
[PLC]
SINK
SOURCE
[X1] to [X7],
Photocoupler
[FWD], [REV]
[CM]