Hitachi X200 Series instruction manual Connecting to PLCs and Other Devices

4−4

Connecting to PLCs and Other Devices

Operations and Monitoring

Hitachi inverters (drives) are useful in many types of applications. During installation, the inverter keypad (or other programming device) will facilitate the initial configuration. After installation, the inverter will generally receive its control commands through the control logic connector or serial interface from another controlling device. In a simple application such as single-conveyor speed control, a Run/Stop switch and potentiometer will give the operator all the required control. In a sophisticated application, you may have a programmable logic controller (PLC) as the system controller, with several connections to the inverter.

It is not possible to cover all the possible types of application in this manual. It will be necessary for you to know the electrical characteristics of the devices you want to connect to the inverter. Then, this section and the following sections on I/O terminal functions can help you quickly and safely connect those devices to the inverter.

CAUTION: It is possible to damage the inverter or other devices if your application exceeds the maximum current or voltage characteristics of a connection point.

The connections between the inverter and

Other device

X200 inverter

other

devices

rely

on

the

electrical

Input

signal

Output

input/output characteristics at both ends of

return

circuit

circuit

each connection, shown in the diagram to the

Output

signal

Input

right.

The

inverter’s

configurable inputs

return

accept either a sourcing or sinking output

circuit

circuit

from an external device (such as PLC). This

chapter shows the inverter’s internal

electrical component(s) at each I/O terminal.

Other device

X200 inverter

In some cases, you will need to insert a power

+ - 24V

source in the interface wiring.

P24

In order to avoid equipment damage and get

your application running smoothly, we

1

recommend drawing a schematic of each

connection

between the inverter

and the

2

Input

other device. Include the internal components

circuits

3

of each device in the schematic, so that it

makes a complete circuit loop.

4

After making the schematic, then:

5

1. Verify that

the current

and voltage for

GND

L

each connection is within the operating

limits of each device.

2.Make sure that the logic sense (active high or active low) of any ON/OFF connection is correct.

3.Check the zero and span (curve end points) for analog connections, and be sure the scale factor from input to output is correct.

4.Understand what will happen at the system level if any particular device suddenly loses power, or powers up after other devices.