6–4

Troubleshooting

Troubleshooting and Maintenance

Symptom/condition

Probable Cause

Solution

 

 

 

 

 

 

 

 

 

 

• If using the analog input, is the

• Check the wiring.

 

 

current or voltage at “O” or “OI?”

• Check the potentiometer or

The motor speed will not reach

 

signal generating device.

 

 

the target frequency (desired

• Is the load too heavy?

• Reduce the load.

speed).

 

• Heavy loads activate the

 

 

 

 

 

 

overload restriction feature

 

 

 

(reduces output as needed).

 

 

 

 

 

 

• Is the load fluctuation too great?

• Increase the motor capacity

 

 

 

(both inverter and motor).

The rotation is unstable.

• Is the supply voltage unstable?

• Fix power supply problem.

• Is the problem occurring at a partic-

• Change the output frequency

 

 

ular frequency?

slightly, or use the jump

 

 

 

frequency setting to skip the

 

 

 

problem frequency.

 

 

 

The RPM of the motor does not

• Is the maximum frequency setting

• Verify the V/F settings

match the inverter output

A04 correct?

match motor specifications.

frequency setting.

• Does the monitor function D01

• Make sure all scaling (such

 

 

 

 

display the expected output

as A11 to A14) is properly

 

 

frequency?

set.

 

 

 

 

 

 

• Was power turned off after a

• Edit the data and press the

 

 

parameter edit but before pressing

Store key once.

 

No downloads

the Store key?

 

 

 

 

 

• Edits to data are permanently

• Wait six seconds or more

Inverter data

have occurred.

 

stored at power down. Was the time

before turning power Off

is not

 

from power Off to power On less

after editing data.

correct.

 

than six seconds?

 

 

 

 

 

 

A download to

• Was the power turned off within six

• Copy the data to the inverter

 

the inverter was

seconds after the display changed

again, and keep power on for

 

attempted.

from REMT to INV?

six seconds or more after

 

 

 

copying.

 

 

 

 

 

True for certain

• Is the inverter in Run Mode? Some

• Put inverter in Stop Mode

A parameter

parameters

parameters cannot be edited during

(press the Stop/reset key).

 

Run Mode.

Then edit the parameter.

will not

 

 

 

 

change after

True for all

• If you’re using the [SFT] intelligent

• Change the state of the SFT

an edit

parameters

input (software lock function), — is

input, and check the B31

(reverts to

 

the [SFT] input on?

parameter (SFT mode).

old setting).

 

• Is switch 4 (located on the back of

• Turn the switch off.

 

 

 

 

the remote operator copy unit) On?

 

 

 

 

 

Page 128 Page 130
Page 129
Image 129
Hitachi L100 instruction manual Signal generating device
Page 128 Page 130

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.
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