4–16

Using Intelligent Input Terminals

Unattended Start Protection

Operations and Monitoring

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. When USP is active and you need to reset an alarm and resume running, either turn the Run command OFF, or perform a reset operation 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 requires outside intervention to reset the alarm by turning OFF the Run command per this example (or applying a reset). Then the Run command can turn ON again and start the inverter output.

RUN command [FW, RV]

1

0

[USP] terminal

1

0

Alarm output terminal

1

0

Inverter output frequency

1

0

Inverter power supply

1

0

 

 

Events:

Alarm

 

 

Alarm

 

 

 

Run

 

 

 

 

 

 

t

 

 

E13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

display

 

 

cleared

command

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Option

Terminal

Function Name

 

Input

 

 

 

 

 

 

Description

 

 

 

Code

Symbol

 

State

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13

USP

Unattended Start

 

ON

 

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:

C_01, C_02, C_03, C_04,

 

Example (default input configuration shown

C_05

 

 

 

 

 

 

 

 

for –FU models; –FE and –FR models

Required settings:

(none)

 

 

 

require input configuration—

 

 

 

 

 

 

see page 3–32):

 

 

 

 

 

 

 

 

 

 

 

 

Notes:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Note that when a USP error occurs and it is

 

 

 

 

 

 

 

USP

 

 

 

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

 

 

 

L

 

5

4

3

2

1

P24

 

inverter restarts running immediately.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Even when the trip state is canceled by turning the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

terminal [RS] ON and OFF after an under voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

See I/O specs on page 4–6.

 

occur. When this function is used, wait for at least

 

three (3) seconds after the powerup to generate a

 

Run command.