4–24

Using Intelligent Input Terminals

Operations and Monitoring

In the previous timing diagram, when the motor has been started across the line, Mg2 is switched OFF and Mg3 is switched ON. With the Forward command to the inverter already ON, the [CS] terminal is switched ON and relay Mg1 contacts close. The inverter will then read the motor RPM (frequency matching). When the [CS] terminal is switched OFF, the inverter applies the Retry wait time before motor restart parameter (B003).

Once the delay time has elapsed the inverter will then start and match the frequency (if greater than the threshold set by B007). If the ground fault interrupter breaker (GFI) trips on a ground fault, the bypass circuit will not operate the motor. When an inverter backup is required, take the supply from the bypass circuit GFI. Use control relays for [FW], [RV], and [CS].

The commercial power source switching function requires you to assign [CS] to an intelligent input terminal, using option code 14.

Opt.

 

Symbol

Function Name

Input

 

 

 

 

 

 

Description

 

 

 

Code

 

State

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

 

CS

Commercial Power

ON

OFF-to-ON transition signals the inverter

 

 

 

Change

 

that the motor is already running at

 

 

 

 

 

powerup (via bypass), thus suppressing

 

 

 

 

 

the inverter’s motor output in Run Mode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF

ON-to-OFF transition signals the inverter

 

 

 

 

 

to apply a time delay (B003), frequency

 

 

 

 

 

match its output to existing motor speed,

 

 

 

 

 

and resume normal Run Mode operation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Valid for inputs:

C001, C002, C003, C004,

Example: (Requires input configuration—

C005, C006, C007, C008

see page 3–47. Jumper position shown is

 

 

 

 

 

 

 

 

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

Required

B003, B007

 

 

see page 4–12.)

 

 

 

 

 

 

 

 

 

settings:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CS

 

 

 

 

 

Notes:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• If an over-current trip occurs during frequency

 

 

TH

FW

8

CM1

5

3

1

 

matching, extend the retry wait time B003.

 

P24

PLC

CM1

 

7

6

 

4

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

See I/O specs on page 4–9.