4－58

458

PID Loop Operation

and

InverterMounting

installation

In standard operation, the inverter uses a reference source selected by parameter A001 for the output frequency, which may be a fixed value (F001), a variable set by the front panel potentiometer, or value from an analog input (voltage or current). To enable PID operation, set A071=01. This causes the inverter to calculate the target freq, or setpoint.

A calculated target frequency can have a lot of advantages. It lets the inverter adjust the motor speed to optimize some other process of interest, potentially saving energy as well. Refer to the figure below. The motor acts upon the external process. To control that external process, the inverter must monitor the process variable. This requires wiring a sensor to either the analog input terminal [O] (voltage) or terminal [OI] (current).

Setpoint

Error

PID

Freq.

Inverter

Motor

External

+

SP

 

Calculation

 

 

 

Process

PV

 

 

 

 

 

 

 

 

 

Process Variable (PV)

 

Sensor

 

 

 

 

 

 

When enabled, the PID loop calculates the ideal output frequency to minimize the loop error. This means we no longer command the inverter to run at a particular frequency, but we specify the ideal value for the process variable. That ideal value is called the setpoint, and is specified in the units of the external process variable. For a pump application it may be gallons/minute, or it could be air velocity or temperature for an HVAC unit. Parameter A075 is a scale factor that relates the external process variable units to motor frequency. The figure below is a more detailed diagram of the function.

Operations Monitoring

and

Standard setting

F001

Multi-speed

settings

A020 to A035

Potentiometer on

keypad

V/I input

select [AT]

AGND L

O

Voltage

OI

Current

Setpoint (Target)

Scale factor

Frequency

 

 

Reciprocal

 

 

source select

Scale factor

 

 

 

 

 

 

1

A001

A072

F001

A075

 

 

 

 

 

P gain

 

 

 

A072

Frequency

 

 

 

 

SP +

I gain

setting

 

+

 

 

A073

 

Process Variable (Feedback)

D gain

 

A074

 

Analog input scaling

 

A012

 

 

Scale factor

Monitor

 

 

 

A011

 

 

A075

D004

A015

A013

A014

 

 

A076 PID V/I input select

 

 

 

NOTE: You cannot use [O] and [OI] simultaneously. For example, if you select [OI] for the setpoint, it is not possible to use [O] for the Process Variable, and vice versa.

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Hitachi CP-X200 instruction manual －58, PID Loop Operation
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CP-X200 specifications

The Hitachi CP-X200 is a versatile and robust projector designed to cater to the needs of educational and business environments. It combines affordability with high-quality performance, making it an attractive option for various presentations and multimedia applications.

At the heart of the CP-X200 is its high brightness capability, with a lumen output of 3,000 ANSI lumens. This feature enables the projector to deliver clear and vibrant images even in well-lit rooms. The resolution of XGA (1024 x 768 pixels) ensures that text and graphics are sharp, making it suitable for everything from classroom lectures to corporate presentations.

One of the standout characteristics of the Hitachi CP-X200 is its advanced lamp technology. The projector uses a long-lasting lamp that can provide up to 5,000 hours of usage in standard mode, allowing for extended intervals between lamp replacements. Additionally, the ECO mode can further enhance the lamp life, extending its longevity while reducing energy consumption.

The CP-X200 is equipped with a variety of connectivity options, including HDMI, VGA, and composite inputs, allowing users to easily connect it to various devices such as laptops, DVD players, and other multimedia systems. The inclusion of USB and RS-232 interfaces ensures compatibility with different control systems, making it a flexible choice for diverse setups.

Another significant feature is the projector's built-in 10-watt speaker, which provides decent audio output, eliminating the need for external speakers in smaller venues. The speaker system enhances presentations, ensuring that audio and visuals are cohesive, promoting better audience engagement.

Portability is another key aspect of the Hitachi CP-X200, which weighs just around 3.5 kg (approximately 7.7 lbs), allowing for easy transport between locations. Its compact design makes it suitable for both fixed installations and mobile use, catering to professionals who require a projector that adapts to various environments.

The user-friendly interface and robust remote control enhance the projector's operability, providing easy access to essential functions. Additionally, features such as auto keystone correction adjust the image to maintain consistent quality even when the projector is not perfectly aligned with the screen.

In summary, the Hitachi CP-X200 is a feature-rich projector that embodies reliability, performance, and ease of use. Its combination of high brightness, various connectivity options, long lamp life, portability, and integrated audio makes it an excellent choice for education and business professionals seeking a dependable presentation solution.
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