Hitachi SJ300 Series Quick start guide

PGC - 10/23/01 Page 1of 1

Hitachi America, Ltd.

EN-102301-1

ENGINEERING NOTE

SUBJECT: CAUTIONS!! ANALOG INPUT FUNCTION

AFFECTED MODELS: ALL SJ300 AND L300P

If the value of parameter A001 (Frequency Source Selection) is set to “01”

(terminal)

- AND -

the AT function (data=16) is NOT assigned to any of the intelligent input

terminals, the function of the “O2” analog input terminal will be as described in

the table below:

Value of Parameter

A006 (O2 Selection) Action of Analog Inputs

00 ( Independent) Only the signal at the O2 terminal will reflected.

Terminals O and OI will be disabled. When the signal at

O2 becomes negative, the speed reference becomes

negative, resulting in REVERSE direction of rotation. The

action is the same when the multispeed terminal(s)

and/or the jog terminals are ON.

01 (Only Positive) The speed reference will be the SUM of O+OI+O2. When

the sum is negative, speed will be ZERO.

02 (Both Positive and

Negative The speed reference will be the SUM of O+OI+O2. When

the sum is negative, the speed reference becomes

negative, resulting in REVERSE direction of rotation. The

action is the same when the multispeed terminal(s)

and/or the jog terminals are ON

Summary: In the case where the AT function is not assigned to any input

terminal, and REVERSE rotation is not desired or unsafe, make sure that A006 is

set to a value of “01”.

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