Connecting to PLCs and Other Devices, 24V, Circuits

4–4

Connecting to PLCs and Other Devices

Hitachi inverters (drives) are useful in many types of applications. During installation, the inverter keypad (or other programming device) will facilitate the initial configura- tion. 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 poten- tiometer 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.

The variety of applications is practically endless, and is beyond the scope of this manual. It will be important 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 in your application if the maximum current or voltage characteristics of a connection point are exceeded.

Operations and Monitoring

The connections between the inverter and other devices rely on the electrical input/ output characteristics at both ends of each connection, shown in the diagram to the right. The inverter’s inputs require a sourcing output from an external device (such as a PLC). This chapter shows the inverter’s internal electrical component(s) at each I/O terminal. In some cases, you will need to insert a power source in the interface wiring.

In order to avoid equipment damage and get your application running smoothly, we recommend drawing a schematic of each connection between the inverter and the other device. Include the internal compo- nents of each device in the schematic, so that it makes a complete circuit loop.

After making the schematic, then:

1.Verify that the current and voltage for each connection is within the operating limits of each device.

Other device		L100 Inverter
Input	signal		Output
	return
circuit			circuit
	signal
Output			Input
	return
circuit			circuit

PLC		Inverter
COM	P24	24V
	P24	+ –
	1
	2	Input
	3	Input
	3	circuits
		circuits
	4
	5
	6
	L

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.

L100 specifications

The Hitachi L100 series is a versatile range of variable frequency drives (VFDs) designed to enhance performance in various industrial applications. Known for their reliability and efficiency, these drives are widely used in motors for pumps, fans, compressors, and conveyors.

One of the main features of the Hitachi L100 is its impressive control capabilities. The drive supports both scalar and vector control modes, allowing for precise speed and torque management. This flexibility ensures optimal motor performance across different load conditions. Additionally, the L100 series offers an impressive speed range, which can accommodate a wide variety of applications, from low-speed to high-speed requirements.

The L100 is equipped with built-in functionality for energy saving. By utilizing advanced control algorithms and auto-tuning features, the drive optimizes energy consumption, reducing operational costs and contributing to improved overall system efficiency. The energy-saving mode is particularly beneficial in applications where load conditions frequently change.

Another hallmark of the Hitachi L100 is its robust communication capabilities. The drive supports various communication protocols including Modbus and Ethernet, making it easy to integrate into existing control systems. This connectivity allows for real-time monitoring and diagnostics, which aids in predictive maintenance and minimizes downtime.

In terms of user-friendliness, the L100 series includes a clear, intuitive keypad that simplifies programming and operation. The drive also features a wide range of customizable parameters, enabling users to easily tailor the settings to suit specific application requirements. Additionally, the inclusion of a customizable PID controller allows users to refine process control automatically.

Safety is a priority in the design of the Hitachi L100. The drive comes with various built-in safety features such as overvoltage, overload, and short-circuit protection, ensuring reliable operation in challenging environments. Furthermore, it complies with global safety standards, making it suitable for international applications.

Lastly, the L100's compact design ensures easy installation and minimizes the space required in control cabinets. This is especially advantageous in facilities where space is at a premium. Overall, the Hitachi L100 series represents a combination of advanced technology, user-friendly features, and reliable performance, making it a popular choice for industrial automation solutions.

Hitachi L100 instruction manual Connecting to PLCs and Other Devices, 24V, Circuits, Com

Models: L100