4–22

Using Intelligent Input Terminals

Operations Monitoring

Unattended Start Protection

If the Run command is already present 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. When USP is active, there are two ways to reset an alarm and resume running:

1.Turn the Run command OFF, or

2.Perform a reset operation by the terminal [RS] input or the keypad Stop/reset key

The three examples below show how the USP function works in the scenarios described at the bottom of the diagram. The error code E13 indicates the USP trip state and corresponds to the Alarm signal in the diagram.

 

 

Example 1

 

Example 2

 

 

Example 3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

supply

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[FW]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[USP]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[RS]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Alarm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Output

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

frequency

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

t

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

When USP is ON after powerup, the

If the alarm is cleared

If the Run command is

alarm (E13) will clear when the Run

during Run command,

already OFF at powerup,

command (FW or RV) turns OFF.

the inverter output

the inverter output starts

 

 

 

 

 

 

restarts automatically.

normally.

and

Opt.

Symbol

Function Name

Input

 

 

 

 

Description

 

 

 

Code

State

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13

USP

Unattended Start

ON

At powerup, the inverter will not resume a

 

 

Protection

 

Run command

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

At powerup, the inverter will resume a

 

 

 

 

Run command that was active before

 

 

 

 

power loss

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Valid for inputs:

C001, C002, C003, C004,

Example: (Dfault input configuration

C005, C006, C007, C008

shown for -FU models; -FE and -F models

 

 

 

 

 

 

require input configuration—

 

 

 

Required

(none)

 

 

 

 

 

see page 3–47. Jumper position shown is

settings:

 

 

 

for –xFU/-xFR models; for –xFE models,

 

 

 

 

see page 4–12.)

 

 

 

 

 

 

 

 

Notes:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Note that when a USP error occurs and it is

 

 

 

 

 

 

USP

 

 

 

 

 

canceled by a reset from the [RS] terminal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TH

FW

8

 

CM1

5

 

3

 

1

 

input or keypad, the inverter restarts immedi-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P24 PLC CM1

7 6

4

2

 

ately.

 

 

 

 

 

•Even when the trip state is canceled by turning

the terminal [RS] ON and OFF after an under- voltage trip E09 occurs, the USP function will be performed.

•When the Run 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 powerup before

See I/O specs on page 4–9.

 

applying a Run command.