Analog and Digital Monitor Output

L100 Inverter

4–25

In the system design for the inverter application, it is useful to monitor the inverter operation from a remote location. In some cases, this is only a panel-mounted analog meter (moving-coil type). In other cases, a controller device such as a PLC may command the inverter frequency and other functions. Sometimes it is useful to have the inverter transmit the (real-time) output frequency value back to the controller to confirm actual operation. The analog output function serves these purposes.

The inverter provides an analog/digital output terminal primarily for frequency monitoring on terminal [FM] (frequency monitor). It uses terminal [L] as analog GND reference. If needed, you can configure terminal [FM] to transmit the inverter current output value instead.

H O OI L FM CM2 12 11

AGND Analog/digital Output

See I/O specs on page 4–5.

Parameter C23 selects the output signal data and transmission format. The selections are:

•C23 = 00 Analog monitor output frequency, pulse-width modulated (PWM) format

•C23 = 01 Analog monitor output current, pulse-width modulated (PWM) format

•C23 = 02 Digital monitor output frequency, frequency-modulated format

The analog PWM signals are primarily designed for driving a moving-coil meter. The pulse-width modulated signal is automatically averaged by the inertia of the moving-coil mechanism. The meter’s indicator needle mechanically converts the PWM signal to an analog representation. Be sure to use a 10V full-scale DC voltmeter.

H	O OI	L	FM CM2 12 11
		–	+
			0 to 10V,
			1 mA

The signal characteristics of [FM] for each of the output formats are shown below:

Pulse-width modulation (analog)

and

[FM]	t
	t
10V
0 V
	T

t Output value = ---

T = 4 ms	time

C23 = 00 Inverter output frequency

C23 = 01 Inverter output current

B81 PWM scale factor

Operations Monitoring

Frequency Monitor, PWM Signal – (C23 = 00) The [FM] output duty cycle varies with the inverter output frequency. The signal period T is fixed at 4 ms, and the amplitude is fixed at 10 VDC. The signal on [FM] reaches full scale when the inverter outputs the maximum frequency. You can scale the duty cycle with a scale factor setting with param- eter B81. This is a dedicated indicator, so that it cannot be used as a line speed signal.

NOTE: The indicator accuracy after adjustment is about ± 5%. Depending on the motor, the accuracy may exceed this value.

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 Analog and Digital Monitor Output, Pulse-width modulation analog

Models: L100

L100 Inverter