Unattended Start Protection, Usp

L100 Inverter

4–13

Unattended Start Protection

If the Run command is already set when power is turned on, the inverter starts running immediately after powerup. The Unattended Start Protection (USP) function prevents that automatic startup, so that the inverter will not run without outside intervention. To reset an alarm and restart running, turn the Run command off or perform a reset opera- tion by the terminal [RS] input or the keypad Stop/reset key.

In the figure below, the [UPS] feature is enabled. When the inverter power turns on, the motor does not start, even though the Run command is already active. Instead, it enters the USP trip state, and displays E13 error code. This forces outside intervention to reset the alarm by turning off the Run command. Then the Run command can turn on again and start the inverter output.

RUN command [FW, RV]

[USP] terminal

Alarm output terminal

Inverter output frequency

Inverter power supply

Alarm E13

Alarm Run

time

display

cleared command

Option

Terminal

Function Name

Input

Description

Code

Symbol

State

USP

Unattended Start

On powerup, the inverter will not resume a Run

Protection

command (mostly used in the US)

OFF

On powerup, the inverter will resume a Run

command that was active before power loss

Valid for inputs:

C01, C02, C03, C04, C05

Example:

Required settings:

(none)

USP

Notes:

P24

• Note that when a USP error occurs and it is

canceled by a reset from a [RS] terminal input, the

inverter restarts running immediately.

• Even when the trip state is canceled by turning the

terminal [RS] on and off after an under voltage

See I/O specs on page 4–5.

protection E09 occurs, the USP function will be

performed.

•When the running command is active immediately after the power is turned on, a USP error will occur. When this function is used, wait for at least three

(3) seconds after the powerup to generate a Run command.

Operations and Monitoring

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 Unattended Start Protection, Usp

Models: L100